US3124231A - Transfer mechanism - Google Patents

Transfer mechanism Download PDF

Info

Publication number
US3124231A
US3124231A US3124231DA US3124231A US 3124231 A US3124231 A US 3124231A US 3124231D A US3124231D A US 3124231DA US 3124231 A US3124231 A US 3124231A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
belt
elevator
belts
lower
vertical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Publication date
Grant date

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/46Machines having sequentially arranged operating stations
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00Discharge tubes and lamps
    • H01J2893/0096Transport of discharge tube components during manufacture, e.g. wires, coils, lamps, contacts, etc.

Description

March 10, 1964 e. E. OTT, JR

TRANSFER MECHANISM 2 Sheets-Sheet 1 Filed Feb. 25, 1962 Tm, q e T.T n c w aw K U n 2% mmfls G .H H

March 10, 1964 G. E. OTT, JR 3,124,231

TRANSFER MECHANISM Filed Feb. 23, 1962 2 Sheets-Sheet 2 United States Patent 3,124,231 TRANSFER MECHANEM George E. (lit, In, Eastlake, Ohio, assignor to General Electric Company, a corporation of New York Filed Feb. 23, 1962, Ser. No. 175,188 3 Claims. ((31. 198-20) This invention relates to article transfer mechanisms, and more particularly to mechanism for transferring articles vertically upward. The mechanism is particularly useful for transferring fragile articles such as glass elec tric lamp bulbs or finished lamps.

It is an object of the invention to provide a mechanism which will continuously accept articles introduced thereto at random thereby avoiding the need for escapement mechanism for feeding articles individually thereto. Further objects include the provision of mechanism which is compact, relatively inexpensive, less complicated than prior art devices and less subject to wear.

In accordance with one feature of the invention, in a transfer mechanism comprising a pair of endless belts having outer surfaces provided with resilient gripping protuberances and arranged to provide coextensive vertical run or elevator portions wherein the outer belt surfaces are in spaced and opposed relationship for resiliently gripping an article therebetween, and wherein the articles are fed along a horizontal path toward the lower end of the elevator portion, there is provided a pair of rotatable transfer discs at opposite edges of one of the said elevator belts and straddling the space between said elevator belts for carrying the articles from the horizontal path into the vertical path of the elevator belts. The transfer is made effective and positive, and without breakage or frictional contact of the glass bulbs with any abrasive surface, by providing the opposed faces of the transfer discs with resilient protuberances between which the bulb is held firmly but gently.

Further features and advantages of the invention will appear from the following detailed description thereof and from the drawings wherein:

FIG. 1 is a side elevation of a transfer mechanism comprising the invention;

FIG. 2 is an end view of the FIG. 1 device taken from a vertical section through the horizontal input and output conveyors along the line 22 in FIG. 1;

FIG. 3 is a horizontal section through the vertical elevator portion along the line 33 in FIG. 2 and looking downward;

FIG. 4 is a perspective view of the transfer discs and the lower end portion of one of the associated elevator belts;

FIG. 5 is a perspective view of a transfer disc having a gripping surface of modified form; and

FIG. 6 is a fragmentary schematic elevation of a modified arrangement of the upper output end of the elevator belts.

In the device shown in FIGS. 1 to 4, electric lamps comprising conventional pear-shaped glass bulbs 1 and screw thread metal bases 2 are carried along a horizontal conveyor comprising, in this case, a pair of spaced, endless belts 33, with the lamps suspended base down between the upper run of said belts. The lamps 1 are carried by the conveyor belts 33 into the space between a pair of rotatable transfer discs 4-4 (FIGS. 1 and 2) having their inner, opposed faces provided with a multiplicity of flexible resilient protuberances, in this case parallel ribs or cleats 5 of rubber which grip the bulb 1 at its maximum diameter. The discs 4-4 carry the bulbs around and up into the lower end of an elevator formed by the spaced, opposed vertical run portions of a pair of belts 66 which are also provided on their outer faces with flexible resilient protuberances 7. In this case, the

said protuberances 7 are constituted of transverse ribs or cleats of flexible material such as rubber, the tips of which, in the said vertical run or elevator portions, are spaced apart a distance slightly less (about /8 inch for example) than the maximum diameter of the glass bulb 1. In the said vertical run or elevator portion of the belts, they are maintained in rigid spaced relationship by back-up plates 88.

The lamps 1 are transferred from the upper end of the vertical run or elevator portion of the belts 6--6 onto a horizontal output conveyor, here illustrated as comprising a fiat endless conveyor belt 9. One mode of effecting that transfer is to employ a second pair of transfer discs 1illtl, like discs 4-4, and arranged to grip a bulb 1 at the upper end of the elevator belts 6-6 and carry it over and onto the conveyor belt 9.

Referring more specifically to the particular arrangement shown in FIGS. 1 to 4 by way of example, the elevator belts 6 run around respective pairs of upper and lower pulleys 11-12 and l314 which are mounted on respective shafts 15-16-47 and 18 which are journaled in pairs of bearing blocks l2l-21 and 22 mounted on the flanges of pairs of upright channel-shaped standards 24 and 25 constituting part of the framework of the device. The back-up plates 8, which support the belts 6 in the vertical runs, which may have a length of a few feet or several stories of a building, are supported from respective pairs of columns 24 and 25.

The lower transfer discs 44 are attached to the shaft 16 of pulley 12 at opposite edges of the associated elevator belt 6 so that their peripheries straddle the space between the vertical run portions of the pair of belts 6-6. Similarly, the upper discs 1illtl are aifixed to the shaft 15 of pulley 11.

The belts 3 of the lower input conveyorrun around pairs of pulleys 26 and 27 which are afiixed, respectively,

,to a shaft 28 supported in bearings on a pair of upright standards 29, and to a shaft 30 supported from the pair of standards 25.

The belt 9 of the upper output conveyor runs around pulleys 31 and 32 which are affixed to shafts 33 and 34 supported on bearings mounted on a pair of horizontal girders 35. The lamp bulbs 1 are confined on the belt '9 between the divergent trough members as mounted on the girders 35. In the structure illustrated herein the lamps are carried by the upper discs it against an inclined plate member 37 (FIG. 1) down which they slide between guide plates 38 onto the belt 9.

The elevator belts 6, and upper and lower conveyors 9 and 3, are actuated in any suitable manner, either at the same lineal speeds, or at progressively greater speeds with the belts 6 traveling faster than belts 3, and belt 9 faster than belts 6. As here illustrated, a drive chain 39 (FIG. 1) driven from a motor and gear reducer assembly (not shown), drives a sprocket 49 on the shaft 16 to rotate pulley 12 and transfer discs 4 counterclockwise in FIG. 1. The pulley 12 drives its associated belt 6 which drives the upper pulley 11 and discs ill. The upper conveyor belt 9 is driven by a chain 41 wrapped around sprockets on the shafts 15 and 34 of the pulleys l1 and 32. The upper pulley 13 is driven clockwise in FIG. 1 from pulley 11 by the bevel gears 42 and 43 on respective shafts 15 and 17 of said pulleys ill and 13, which bevel gears mesh with respective bevel gears 44 and 45 which are mounted on the ends of a shaft 46 journalled in a bearing 47 mounted on a cross member portion 48 of the framework. The upper pulley 13 drives its associated elevator belt 6 which drives the lower pulley 14. The lower conveyor belts 3 are driven by a chain 49 which is wrapped around sprockets on the respective shafts 18 and 30 of pulleys 14 and 27.

Although the lower pulleys l2 and 14 for respective belts 66 (FIG. 1) may be at the same elevation, in the illustrated form the pulley 14 is at a somewhat lower elevation. In order to prevent any tendency of the lamp 1 to become canted while being carried upward by the transfer discs 44, with the consequent possibility of the base end 2 being caught between the periphery of one of the discs 4 and the surface of the right hand belt 6 (FIG. 1), there is provided a pair of generally V-shaped guides or retaining shields i supported by columns 25 adjacent the peripheries of each of the discs 4. To the same end, a second pair of shields 51 may be provided adjacent the upper discs -10.

It will be evident that the twin belt conveyor 3 may be replaced by a flat belt conveyor like the upper conveyor arrangement 936 with the lamps lying thereon horizontally, base end 2 trailing. It will also be evident that the parallel rib or cleat arrangement shown at 5 on discs 4 and at 7 on the belts 6 may be modified to provide any of a number of forms of flexible protuberances such as the diamond-shaped pattern of ribs shown at 52 on the disc 4a in FIG. 5. In that case, the individual ribs of the diamond-shaped pattern are preferably slittecl transversely for increased flexibility.

FIG. 6 shows a modification of the upper end of the elevator wherein the belt 6a associated with the upper transfer discs 10a is run over a pulley 53 to provide an inclined portion 54 of the belt 6a which carries the lamp 1 onto the upper horizontal conveyor belt 9a. The said belt 6a runs around another idler pulley 55. The construction may otherwise be the same as shown in FIGS. 1-4.

It will be noted that the input conveyor 3 is arranged to carry the lamps 1 along a path which lies in a vertical plane VV (FIG. 2) including the vertical run portions of both the elevator belts 6'6 and which leads the lamps to a point adjacent the lower end of the vertical run portion of one of said belts 6, where the lamps are picked up by the transfer discs 4-4 and carried upwardly into the space between the belts 66. In addition to effectively performing the operation of carrying the lamps from the horizontal conveyor 3 into the vertical elevator belts 66, this arrangement makes it possible to devise a compact grouping of a plurality of conveying mechanisms, such as shown in FIG. 1, in side-by-side relationship when it is desired to convey lamps in a plurality of individual rows.

What I claim as new and desire to secure by Letters Patent of the United States is:

l. A transfer mechanism comprising a pair of first and second endless elevator belts having generally coextensive vertical run portions in spaced and opposed relationship and running around respective pairs of upper and lower pulleys, the lower pulley for said second belt being at a lower elevation than the lower pulley for said first belt so that the vertical portion of the second belt extends below that of the first belt, the outer surfaces of said belts having thereon a plurality of closely spaced resilient protuberances for resiliently gripping an article between the opposed vertical run portions thereof, a generally horizontal input conveyor means arranged to carry articles along a path which lies in a vertical plane including the vertical run portions of both said elevator belts and which leads the articles to a point adjacent the lower end of the vertical run portion of the first said elevator belt, a pair of fixedly spaced apart transfer discs mounted on the same horizontal axis as the lower pulley for said first elevator belt for rotation adjacent opposite edges of said first elevator belt and said input conveyor and straddling the space between the elevator belts at the lower end of the coextensive part of their vertical run portions, said transfer discs having their opposed inner faces provided with a plurality of closely spaced resilient protuberances and arranged to resiliently grip therebetween an article advanced thereto by said input conveyor and carry the article against the surface of said second elevator belt and up into the space between the vertical run portions of said elevator belts, and means to move said elevator belts and input conveyor and to rotate said transfer discs in directions to effect movement of articles along said input conveyor to said transfer discs and thence into the lower end of the vertical run portions of said elevator belts and thence upwardly along said vertical run portions of the elevator belts.

2. A transfer mechanism as set forth in claim 1 wherein said transfer discs are mounted on and rotatable with a shaft which also carries the lower pulley associated with said one elevator belt.

3. A transfer mechanism as set forth in claim 2 including a second pair of transfer discs like the first-mentioned pair and mounted on and rotatable with a shaft which also carries one of the said upper pulleys to thereby straddle the upper end of the vertical run portion of said elevator belts and remove articles therefrom.

References Cited in the file of this patent UNITED STATES PATENTS

Claims (1)

1. A TRANSFER MECHANISM COMPRISING A PAIR OF FIRST AND SECOND ENDLESS ELEVATOR BELTS HAVING GENERALLY COEXTENSIVE VERTICAL RUN PORTIONS IN SPACED AND OPPOSED RELATIONSHIP AND RUNNING AROUND RESPECTIVE PAIRS OF UPPER AND LOWER PULLEYS, THE LOWER PULLEY FOR SAID SECOND BELT BEING AT A LOWER ELEVATION THAN THE LOWER PULLEY FOR SAID FIRST BELT SO THAT THE VERTICAL PORTION OF THE SECOND BELT EXTENDS BELOW THAT OF THE FIRST BELT, THE OUTER SURFACES OF SAID BELTS HAVING THEREON A PLURALITY OF CLOSELY SPACED RESILIENT PROTUBERANCES FOR RESILIENTLY GRIPPING AN ARTICLE BETWEEN THE OPPOSED VERTICAL RUN PORTIONS THEREOF, A GENERALLY HORIZONTAL INPUT CONVEYOR MEANS ARRANGED TO CARRY ARTICLES ALONG A PATH WHICH LIES IN A VERTICAL PLANE INCLUDING THE VERTICAL RUN PORTIONS OF BOTH SAID ELEVATOR BELTS AND WHICH LEADS THE ARTICLES TO A POINT ADJACENT THE LOWER END OF THE VERTICAL RUN PORTION OF THE FIRST SAID ELEVATOR BELT, A PAIR OF FIXEDLY SPACED APART TRANSFER DISCS MOUNTED ON THE SAME HORIZONTAL AXIS AS THE LOWER PULLEY FOR SAID FIRST ELEVATOR BELT FOR ROTATION ADJACENT OPPOSITE EDGES OF SAID FIRST ELEVATOR BELT AND SAID INPUT CONVEYOR AND STRADDLING THE SPACE BETWEEN THE ELEVATOR BELTS AT THE LOWER END OF THE COEXTENSIVE PART OF THEIR VERTICAL RUN PORTIONS, SAID TRANSFER DISCS HAVING THEIR OPPOSED INNER FACES PROVIDED WITH A PLURALITY OF CLOSELY SPACED RESILIENT PROTUBERANCES AND ARRANGED TO RESILIENTLY GRIP THEREBETWEEN AN ARTICLE ADVANCED THERETO BY SAID INPUT CONVEYOR AND CARRY THE ARTICLE AGAINST THE SURFACE OF SAID SECOND ELEVATOR BELT AND UP INTO THE SPACE BETWEEN THE
US3124231A Transfer mechanism Expired - Lifetime US3124231A (en)

Publications (1)

Publication Number Publication Date
US3124231A true US3124231A (en) 1964-03-10

Family

ID=3453692

Family Applications (1)

Application Number Title Priority Date Filing Date
US3124231A Expired - Lifetime US3124231A (en) Transfer mechanism

Country Status (1)

Country Link
US (1) US3124231A (en)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314518A (en) * 1964-03-20 1967-04-18 Metal Box Co Ltd Conveyor mechanism for can bodies
US3319771A (en) * 1965-05-28 1967-05-16 Clifford A Nesseth Hay elevator upright screw type bale lift
US3369644A (en) * 1966-11-23 1968-02-20 Otto C. Niederer Egg handling equipment
US3402813A (en) * 1966-10-12 1968-09-24 Gen Electric Lamp bulb conveyor mechanism
US3429420A (en) * 1966-03-31 1969-02-25 Lemforder Kunststoff Gmbh & Co Conveyor installation and conveyor belt system therefor
US3498443A (en) * 1967-05-08 1970-03-03 Elcalor Ag Stacker for conically-shaped containers
US3750801A (en) * 1971-05-23 1973-08-07 Holstein & Kappert Maschf Conveying device
US3802549A (en) * 1972-03-30 1974-04-09 Alpeda Ind Inc Device for handling articles such as bottle or jar type containers
US3921791A (en) * 1972-07-05 1975-11-25 Hauni Werke Koerber & Co Kg Conveyor system for sidewise transport of cigarettes or the like along arcuate paths
US3978971A (en) * 1975-06-06 1976-09-07 General Electric Company Bulb accumulator
US4036355A (en) * 1974-06-11 1977-07-19 Roberto Valli Egg escalator
US4148390A (en) * 1977-07-27 1979-04-10 New England Machinery, Inc. Bottle-conveying apparatus
US4364554A (en) * 1981-01-26 1982-12-21 Bell & Howell Company Conveyor arrangement for mail sorting machines
DE3443071A1 (en) * 1983-11-25 1985-06-05 Molins Plc Foerdereinrichtung for belongings
DE3515353A1 (en) * 1985-04-27 1986-10-30 Seitz Enzinger Noll Masch Device for conveying bottles in a suspended position
US4694637A (en) * 1984-10-17 1987-09-22 Stormax International A/S Method and apparatus for grouping, orienting, and packing articles
US4776451A (en) * 1986-09-26 1988-10-11 Gaddis Donald L Conveyor system for particulate material
FR2657313A1 (en) * 1990-01-23 1991-07-26 Addco Mfg Inc Method and tags dispensing apparatus for roads and transport for their implementation óoeuvre.
US5113992A (en) * 1989-09-21 1992-05-19 Mitsubishi Denki Kabushiki Kaisha Vertical wafer carrying apparatus
US5143199A (en) * 1989-09-29 1992-09-01 Don Evans And Associates, Inc. Hydrostatic cooker infeed
US5161457A (en) * 1989-12-18 1992-11-10 Don Evans & Associates, Inc. Hydrostatic cooker discharge
US5170878A (en) * 1989-12-18 1992-12-15 Don Evans & Associates, Inc. Method of hydrostatic cooker discharge
US5553698A (en) * 1994-12-28 1996-09-10 J And J Container Handling Systems Conveyor belt apparatus for bottles
DE29707657U1 (en) * 1997-04-28 1997-07-10 Leybold Systems Gmbh Device for the transport of disk-shaped substrates in a Vakkuumbeschichtungsanlage or for the magazining
US20060288661A1 (en) * 2005-06-23 2006-12-28 Allwein Robert J Apparatus and method for loading a packaging station of an insulation batt packager
US20110305553A1 (en) * 2009-03-06 2011-12-15 Grohmann Engineering Gmbh Method and Device for Stacking

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1306586A (en) * 1919-06-10 Beet digging and topping machine
US2784832A (en) * 1955-01-19 1957-03-12 Owens Illinois Glass Co Vertical conveying apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1306586A (en) * 1919-06-10 Beet digging and topping machine
US2784832A (en) * 1955-01-19 1957-03-12 Owens Illinois Glass Co Vertical conveying apparatus

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314518A (en) * 1964-03-20 1967-04-18 Metal Box Co Ltd Conveyor mechanism for can bodies
US3319771A (en) * 1965-05-28 1967-05-16 Clifford A Nesseth Hay elevator upright screw type bale lift
US3429420A (en) * 1966-03-31 1969-02-25 Lemforder Kunststoff Gmbh & Co Conveyor installation and conveyor belt system therefor
US3402813A (en) * 1966-10-12 1968-09-24 Gen Electric Lamp bulb conveyor mechanism
US3369644A (en) * 1966-11-23 1968-02-20 Otto C. Niederer Egg handling equipment
US3498443A (en) * 1967-05-08 1970-03-03 Elcalor Ag Stacker for conically-shaped containers
US3750801A (en) * 1971-05-23 1973-08-07 Holstein & Kappert Maschf Conveying device
US3802549A (en) * 1972-03-30 1974-04-09 Alpeda Ind Inc Device for handling articles such as bottle or jar type containers
US3921791A (en) * 1972-07-05 1975-11-25 Hauni Werke Koerber & Co Kg Conveyor system for sidewise transport of cigarettes or the like along arcuate paths
US4036355A (en) * 1974-06-11 1977-07-19 Roberto Valli Egg escalator
US3978971A (en) * 1975-06-06 1976-09-07 General Electric Company Bulb accumulator
US4148390A (en) * 1977-07-27 1979-04-10 New England Machinery, Inc. Bottle-conveying apparatus
US4364554A (en) * 1981-01-26 1982-12-21 Bell & Howell Company Conveyor arrangement for mail sorting machines
DE3443071A1 (en) * 1983-11-25 1985-06-05 Molins Plc Foerdereinrichtung for belongings
US4694637A (en) * 1984-10-17 1987-09-22 Stormax International A/S Method and apparatus for grouping, orienting, and packing articles
DE3515353A1 (en) * 1985-04-27 1986-10-30 Seitz Enzinger Noll Masch Device for conveying bottles in a suspended position
US4802571A (en) * 1985-04-27 1989-02-07 Seitz Enzinger Noll Maschinenbau Aktiengesellschaft Apparatus for conveying suspended bottles
US4776451A (en) * 1986-09-26 1988-10-11 Gaddis Donald L Conveyor system for particulate material
US5113992A (en) * 1989-09-21 1992-05-19 Mitsubishi Denki Kabushiki Kaisha Vertical wafer carrying apparatus
US5143199A (en) * 1989-09-29 1992-09-01 Don Evans And Associates, Inc. Hydrostatic cooker infeed
US5170878A (en) * 1989-12-18 1992-12-15 Don Evans & Associates, Inc. Method of hydrostatic cooker discharge
US5161457A (en) * 1989-12-18 1992-11-10 Don Evans & Associates, Inc. Hydrostatic cooker discharge
FR2657313A1 (en) * 1990-01-23 1991-07-26 Addco Mfg Inc Method and tags dispensing apparatus for roads and transport for their implementation óoeuvre.
US5213464A (en) * 1990-01-23 1993-05-25 Addco Manufacturing, Inc. Method and apparatus for dispensing and retrieving highway warning markers
US5054648A (en) * 1990-01-23 1991-10-08 Luoma Eugene H Highway cone dispenser and collector
US5853080A (en) * 1994-12-28 1998-12-29 J&J Container Handling Systems, Inc. Conveyor belt apparatus for bottles
US5553698A (en) * 1994-12-28 1996-09-10 J And J Container Handling Systems Conveyor belt apparatus for bottles
DE29707657U1 (en) * 1997-04-28 1997-07-10 Leybold Systems Gmbh Device for the transport of disk-shaped substrates in a Vakkuumbeschichtungsanlage or for the magazining
US20060288661A1 (en) * 2005-06-23 2006-12-28 Allwein Robert J Apparatus and method for loading a packaging station of an insulation batt packager
US20070107386A1 (en) * 2005-06-23 2007-05-17 Johns Manville Apparatus and method for loading a packaging station of an insulation batt packager
US7243484B2 (en) 2005-06-23 2007-07-17 Johns Manville Apparatus and method for loading a packaging station of an insulation batt packager
US7243479B2 (en) * 2005-06-23 2007-07-17 Johns Manville Apparatus and method for loading a packaging station of an insulation batt packager
US20110305553A1 (en) * 2009-03-06 2011-12-15 Grohmann Engineering Gmbh Method and Device for Stacking
US8870518B2 (en) * 2009-03-06 2014-10-28 Grohmann Engineering Gmbh Method and device for stacking

Similar Documents

Publication Publication Date Title
US3462001A (en) Container orienting apparatus
US3589497A (en) means for spacing articles on a conveyor
US3595378A (en) Tubular belt conveyor
US4717027A (en) Vibratory belt separator for blow-molded parts
US5350050A (en) Continuous vertical conveyor
US1837605A (en) Apparatus for handling materials
US4276980A (en) Conveyor belt for conveyor system
US3518944A (en) Steplessly variable-speed conveyor
US3288271A (en) Conveyer
US3289818A (en) Conveyor for handling unit loads
US3367494A (en) Small potato eliminator structure
US3581875A (en) Roller conveyor
US3131801A (en) Vertical type endless conveyor
US2234537A (en) Belt conveyer
US3184032A (en) Arrangement in paternoster elevators
US4406359A (en) Method and apparatus for mass transit of cylindrical articles between differing elevations
US3321060A (en) Passenger conveyors employing handrails
US3367473A (en) Agitating article feed chute
US4231469A (en) Conveyor
US4103768A (en) Conveyor for conveying articles in a helically curved path
US3572496A (en) Adjustable angulated conveyor system in which holddown rollers are employed to secure a ridged belt to channeled pulleys
US3214001A (en) Unscrambler
US4142625A (en) Holding conveyor system
US3283878A (en) Passenger conveyors
US2813617A (en) Article aligning machine