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Publication numberUS3047166 A
Publication typeGrant
Publication dateJul 31, 1962
Filing dateDec 26, 1957
Priority dateDec 26, 1957
Publication numberUS 3047166 A, US 3047166A, US-A-3047166, US3047166 A, US3047166A
InventorsArthur W Lamp, Carl R Meckstroth
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lamp transfer and inverting apparatus
US 3047166 A
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Description  (OCR text may contain errors)

July 31, 1 A. w. LAMP ETAL LAMP TRANSFER AND INVERTING APPARATUS Filed Dec. 26, 1957 5 Sheets-Sheet 1 Inlw ve Sm n v ar

omwgv n w LOU mim A P a n u 9 T July 31, 1962 A. w. LAMP ETAL LAMP TRANSFER AND INVERTING APPARATUS 3 Sheets-Sheet 2 Filed Dec. 26, 1957 smmM m T63O OLS 1T Twk i nvMWW u .W Vh e 2* w y 1962 A. w. LAMP ETAL 3,047,166

LAMP TRANSFER AND INVERTING APPARATUS Filed Dec. 26, 1957 3 Sheets-Sheet 3 Irv/an hers: Av thuv W. Lamp, (161% R. Mecl str-oth,

ThEIT' Attovne9 3,047,166 LAMP TRANSFER AND INVERTING APPARATUS Arthur W. Lamp, Lyndhurst, and Carl R. Meckstroth,

South Euclid, Ohio, assignors to General Electric Company, a corporation of New York Filed Dec. 26, 1957, Ser. No. 705,208 2 Claims. (Cl. 2141) This invention relates to apparatus for the manufacture of electric lamps of the double ended type having a mount sealed into each end thereof, to lamp trans-' fer mechanism for transferring a lamp from one manufacturing machine to a second manufacturing and assembling machine, and more particularly to an apparatus for sealing the mount into the opposite ends of the tubular envelope of the lamp.

In the manufacture of tubular fluorescent lamps of the type in general use at present, a separate lamp mount or stem assembly, comprising a glass steam having lead-in wires sealed therethrough and supporting an electrode thereon, is sealed into each end of the tubular glass lamp envelope. The sealing operation is generally carried out on a sealing machine customarily comprising a horizontal turret which supports and holds the tubular lamp envelope in a vertical position with its lower end resting on the glass stem portion of the lamp mount, and then indexes the so positioned envelope and mount to a series of sealing stations where they are suitably heated, as by gas tires, to fuse and seal the envelope end to the glass stem of the mount.

After the sealing of one end of the lamp, the lamp is removed from the sealing turret, turned end for end, and then placed back in the same or a second sealing turret with its lower unsealed end in sealing relation to another lamp mount on the second turret. The turning of the lamp end for end may be carried out either manually or automatically. Where the inverting operation is manual, it is very inconvenient to perform where the lamp is of considerable length, such as in the case of the common six and eight foot long fluorescent lamp in common use at present. Because of the considerable length, such lamps are unwieldy and awkward to handle. For such reason, it is difficult to prevent the lamp from striking against objects in the immediate vicinity (such as the sealing machine or other adjacent apparatus) and becoming broken during the inverting operation. Automatic transfer and inverting devices, such as that shown and described in Patent 2,844,917 issued on July 29, 1958 to Richard D. Caldwell and assigned to the same assignee as the instant application, are known. However, difiiculty has been experienced in adapting the apparatus disclosed and claimed in the Caldwell application to the transfer of lamps of substantial length, i.e., lamps of the six and eight foo-t length, due to the limited space available normally in the factory for performing the transfer and inverting operation.

It is therefore an object of this invention to provide a sealing apparatus for tubular type lamps of substantial length which will operate to automatically seal one end of a tubular lamp envelope and then invert the lamp and seal the other end thereof.

Another object of the invention is to provide a lamp manufacturing apparatus having two separate mechanisms verting tubular lamp envelopes having substantial length without interfering with or interrupting the operation of the associated manufacturing processes thereof and without damaging the lamp envelope.

A further object of this invention is to provide a double-turret type automatic sealing machine for sealing the lower ends of tubular lamp. envelopes of substantial length positioned on each sealing turret, together with a combination transfer and inverting mechanism for automatically transferring the lamp envelopes from one turret to the other, and positioning them in inverted position on the second turret.

In accordance with one aspect of our invention, two conventional turret type lamp sealing machines are positioned in adjacent side by side relation to support lamps vertically and with a common drive means for indexing them in timed relation with each other, and two transfer arms provided with lamp gripping means and operating in timed relation to the indexed movements of the sealing turrets are mounted in a position between the two sealing turrets; the first arm is arranged to grip the lamp at the unloading station at one of said turrets and at a point substantially to one side of the mid-point of the lamp and then swing in a horizontal plane and rotate the lamp about a horizontal axis transverse to the lamp axis to simultaneously transfer and rotate the lamp to the horizontal position and place it in position wherein it is gripped by the second transfer arm at a point on the opposite side of its mid-point from that gripped by the first arm; the second transfer arm further rotates the lamp about a horizontal axis transverse to the lamp axis to the vertical position and simultaneously transfers the lamp to the second sealing machine at the loading station of the turret thereof. Y

Further objects and advantages of the invention will appear from the following detailed description of a species thereof and from the accompanying drawings.

In the drawings, FIG. 1 is a plan view of a sealing apparatus comprising the invention;

FIG. 2 is a fragmentary perspective view of the lamp transfer and inverting mechanism of the sealing apparatus in position for transferring a lamp envelope from one of the heads of the first sealing turret; and

FIG. 3 is a fragmentary perspective View of the lamp M transfer and inverting mechanisms of the sealing apparatus shown in position at the instant of transfer of a lamp envelope from one of the transfer arms to the second transfer arm and further illustrates diagrammatically the operating mechanism for the transfer arms.

The invention is herein shown and described as applied to apparatus for sealing the stem assemblies or lamp mounts of a tubular discharge lamp to the opposite ends of the lamp envelope 1. As shown in FIG. 1, the apparatus comprises a pair of conventional type fluorescent lamp sealing machines 2 and 3 mounted in adjacent side by side relation on a common base or frame 4 and operating in timed relation to each other. The sealing machines 2 and 3 may be of the general type described and claimed in U.S. Patent No. 2,434,664-Mal1oy, dated January 20, 1948, employing gas fires to fuse and seal the glass stem assemblies to the ends of the glass lamp envelope. The machines each comprise respective horizontal turrets or carriers 5, 5 provided with a plurality of heads 6, 6', respectively, located at uniformly spaced intervals around the peripheral region of the respective turrets. The turrets 5, 5 are supported on vertical shafts 7, 7, respectively, journaled in the machine frame 4, and

they are intermittent-1y rotated in a counterclockwise direction in timed relation to each other to successively index or advancethe respective heads 6, 6' to a plurality of work stations A to Q and A to Q, respectively, corre- Patented July 31, 1962 spending in number to the number of heads on each turret. The indexing means for the turrets 5, 5 may be of any wellknown type, for instance, such as that illustrated in U.S. Patent No. 1,742,453, Stiles et al., and comprising a rotating drum-type cam 8, 8 for the respective turret mounted on a common drive or cam shaft 10 and engaging with a plurality of rollers 9, 9, respectively, depending from disks 11, 11 fastened to the respective turret support shafts 7, 7.

The heads 6, 6' on the respective turrets 5, 5 each comprises a vertically extending spindle 12 (FIG. 2) journaled in the turret and arranged to support on its upper end a conventional type lamp mount in proper sealing position relative to the lower end of a tubular lamp envelope 1 held in a vertical position in a holder 13 carried by the finger 12. The holder 13, which may be of the general type disclosed in US. Patent No. 2,512,277, Jacobsen, comprises opposed pivoted jaws 14, 15 which are pivotally mounted on a bracket 16 carried by the spindle 12 and normally held in closed position, to grip the lamp envelope therebetween, by means of a coiled spring 17 anchored at one end to the bracket portion 16 of the holder 13 and connected at its other end to an operating lever 13 for pivoting the jaws 14, 15.

In the operation of each sealing machine, the lamp mount is placed on the spindles 12 of the heads 6 or 6 at the mount loading stations B, B of the respective sealing machines, and the lamp envelope is placed in sealing relation in the holder 13 of the head 6 or 6' at the loading station C, C of the respective sealing machines, after which the turrets 5, 5 index the heads successively through the work stations to Q, Q, at some of which the glass envelope and glass flare of the mount are heated by gas fire from burners (not shown) located thereat to effect the fusion and sealing together of the glass parts, and thence to the unloading stations Q, Q where the sealed envelope and mount are removed from the respective heads 6 or 6. One end of the lamp envelope 1 is sealed in the first sealing machine 2 after which the envelope is transferred to and inserted in an inverted position in the head 6 at station C of the second sealing machine 3 wherein the other end of the envelope is then sealed to its respective mount.

In accordance with the present invention, the transfer and inversion of the lamp envelope 1 from the first sealing machine 2 to the second machine 3 is performed automatically by a transfer mechanism operating in timed relation to the indexed movements and dwell intervals of the two sealing turrets 5, 5. To enable such transfer operation, suitable means 21 are provided for first vertically lifting the envelope 1 on the first turret 5 off the upper end of its respective spindle 12, at one of the stations preceding the unloading station Q (preferably at the immediately preceding station P as shown in FIG. 1), in order to withdraw the customary exhaust tubes depending from the lower end of the envelope from the passageway provided therefor in the spindles so as to clear the upper end of the spindles and permit lateral transfer movement of the envelope from the head 6 without breakage of the exhaust tube. The particular lifting means may be similar to that shown in the above identified Caldwell Patent 2,844,917 and is not herein described in detail. Upon completion of such vertical movement by the envelope, the lamp envelope 1 is supported by the holder 13 at a suificiently high elevation above the spindle 12 that at the subsequent station, upon indexing, the lamp envelope may be moved laterally without interference of the exhaust tube with its associated spindle.

Upon indexing of the elevated envelope 1 to the unloading station Q it is picked up by the transfer mechanism and then simultaneously turned end for end and transferred into the head 6 at the loading station C of the second sealing turret 5. The transfer mechanism for accomplishing this operation comprises a first horizontally extending transfer arm 22 and a second horizontally extending transfer arm 23 located between the two turrets 5 and 5. The transfer arms are similar to that described in the above identified Caldwell Patent 2,844,917 and need not be fully described here. Briefly, however, each transfer arm comprises a hollow shaft rotatably supported on a housing 24, 24' (FIGS. 2 and 3) which is mounted on the upper end of a vertically extending hollow support shaft 25, 25. The shaft 25, 25' is rotatably supported on an upstanding open work support column or standard 26, 26' which is fastened at its lower end on a stationary table portion 27, 27' of the machine framework.

The first transfer arm 22 is oscillated in a horizontal plane between the initial lamp pickup position (as shown in the solid lines in FIG. 1) wherein it grips a lamp envelope I in the head 6 at station Q, and intermediate delivery position (as shown by the dotted lines in FIG. 1) wherein it places the said lamp, partially inverted and in a horizontal position, in the second transfer arm 23 which is in an intermediate lamp pickup position (shown by the dotted lines of FIG. 1). The second transfer arm 23 is oscillated in a horizontal plane between the intermediate lamp pickup position (shown in dotted lines in FIG. 1) wherein it grips the lamp envelope therein deposited by the first transfer arm 22, and a final delivery position (as shown by the solid lines in FIG. 1) while simultaneously rotating the envelope, wherein it places the said lamp, now completely inverted, in the head 6' (as hereinafter more fully explained) at station C of the second turret 5'. The swinging movement or oscillation of the transfer arms 22, 23 is effected by more or less vertically extending lever arms 28, 28' which are .pivoted at their lower ends by means such as pins 29' on stationary brackets (not shown), mounted on the base 35 or bed of the machine. At their upper ends the arms 28, 28' are pivoted to one end of connecting rods or links 30, 30 the other ends of which are pivotally connected to crank arms 31, 31' fastened to the lower ends of the vertical support shafts 25, 25'. The lever arms 28, 28' carry rollers 32, 32' at a point intermediate their ends, which rollers 32, 32' ride in the cam groove of the face cam 33, 33' mounted on the cam shaft 10.

Adjacent its outer or free end, each transfer arm 22, 23 carries an envelope holder 34, 34. The construction and operation of this holder is described in detail in the above identified Caldwell Patent 2,844,917 and is therefore not fully described herein. Briefly, however, each holder comprises a pair of envelope engaging jaws 35, 35' and 36, 36 arranged to be opened and closed through the operation of double acting oil cylinders 37, 37'. The lamp envelopes 1 are gripped and held in a fixed position between the jaws 35, 36 and 35, 36' during the lamp transfer operation. As more fully described in the above identified Caldwell Patent 2,844,917, operation of the hydraulic cylinders 37, 37 actuates the jaws 35, 35 and 36, 36' of the envelope holders 34, 34' into either their open or closed position, depending upon the direction of actuation of the hydraulic cylinders 37, 37. The bydraulic cylinders 37, 37' are actuated by a supply of oil under pressure by means of rigid oil lines or conduits 33, 38' and 39, 39' which are connected through connector blocks 40, 40 to flexible oil lines 41, 41 and 42, 42' connected to four-way control valves 43, 43' which are actuated by the contact of their rollers 44, 44 with cams 45, 45' on the main cam shaft 10 to thereby control the supply of oil to, and therefore the operation of, the hydraulic cylinder in timed relation to the indexing and dwell period of the sealing machines.

The transfer arm 22 is rotated to effect the rotation of the lamp envelope 1 during the interval when the transfer arm is swinging from its lamp pickup to its lamp 1 delivery position so that the lamp envelope 1 is rotated from a vertical to a horizontal position, and the second transfer arm 23 is rotated to effect rotation of the lamp 7 envelope 1 from the horizontal to the vertical position during the interval when the transfer arm is swinging from its lamp pickup position to its lamp delivery position for the second sealing machine 3. The mechanism and operation necessary to effect rotation of these arms is more fully described in the above referenced Caldwell Patent 2,844,917, and therefore is not described in detail herein. Briefly, however, the rotation of the transfer arms 22, 23 is effected by means of vertically extending slide rods 46, 46' extending through the hollow vertical support shafts 25, 25 and into the support housings 24, 24' and carrying at their upper ends vertically extending rack gears 47, 47' which meet with spur gears (not shown) fastened to the transfer arms 22, 23 within their respective housings 24, 24'. The rack gears 47, 47 are vertically slidable within the housings 24, 24 so as to rotate the transfer arms 22, 23 about their longitudinal axes. At their lower ends the slide rods 46, 46 are pivotally connected, by ball and socket connections, to one end of more or less horizontally extending levers 48, 48' pivoted at their other end on brackets 49, 49 upstanding from the machine head plate base 4. Intermediate their endsthe levers 48, 48' carry rollers 50, 50' which ride in the cam grooves of face cams 51, 51' fastened on the cam shaft 10.

Upon indexing of a lamp envelope 1 to the lamp transfer station Q of the first turret 5, the envelope engaging jaws 35 and 36 carried by the envelope holder 34 of the first transfer arm 22 are first closed by the operation of the hydraulic cylinder 37 (as previously explained) so as to cause the said jaws to firmly grip the envelope 1 of the lamp which is at such time held in the holder 13 on the turret 5. The arm 22 is at an elevation such that it grips the lamp envelope 1 well below its mid-point. After the lamp has thus been gripped by the transfer arm holder 34,

the grip of the holder 13 on the lamp is then released by the opening of the jaws 14 and 15 thereof through the operation of a horizontally extending actuating lever 52 which is pivoted on the stationary column as and which engages at one end with and depresses the jaw-opening lever 18 of the holder 13. The other end of the holder actuating lever 52 is connected by a vertically extending link 53 (FIG. 1) to an intermediate point of a more or less horizontally extending arm lever 54 pivoted at one end on a support bracket 55 secured to a stationary portion of the machine framework. The other end of the cam lever 54 carries a roller 56 which rides on the periphery of an edge cam 57 mounted on the cam shaft 1t.

Following the release of the lamp 1 by the holder 13 at station Q, the transfer arm 22 is then swung clockwise as viewed from above, to its delivery position, by the operation of the cam 33, lever 28 and connecting link 36 (as previousiy described) to deliver the lamp to the envelope holder 34 of the second transfer arm 23.

Simultaneously with the said swinging movement of the transfer arm 22 from its lamp pickup position (as shown by the solid lines in FIG. 1) to its lamp delivery position as shown by the dotted lines in FIG. 1), the transfer arm 22 is rotated 90 about its longitudinal axis, in a counterclock-wise direction as viewed from its outer end, to rotate the lamp envelope 1 about a transverse axis through the operation of the cam 51, lever 48, slide rod 46 and the intermeshed rack gear 47 and spur gear. At the moment the lamp envelope 1 is thus rotated to the horizontal position, the second transfer arm 23 is in its lamp receiving position to grip the envelope 1 at a point on the opposite side of its mid-point from that gripped by the arm 22, as best illustrated in FIG. 3. The envelope engaging jaws 35 and 36 of the second transfer arm 23 are held in the open position through the action of the hydraulic cylinder 37. With the lamp in the position illustrated in FIG. 3, the jaws 35 and 36' of the envelope holder 34 close around the lamp envelope 1 through the operation of the cylinder 37, its associated four-way acting valve 43' and related cam 45'. The jaws 35 and 36 of the envelope holder 34 on the first transfer arm 22 are opened by the interaction 6 of the hydraulic cylinder 37 with its four-way acting valve 43 and associated cam 45.

The second transfer arm 23 is then rotated clockwise as viewed from above from its lamp pickup position (as shown by the dotted lines in FIG. 1) to its lamp delivery position (as shown by the solid lines in FIG. 1) by the action of the cam 33, lever 28 and connecting link 36'. Simultaneously with the movement of the transfer arm 23 from its lamp receiving position to its lamp delivery position the transfer arm 23 is rotated counterclockwise as viewed from its end by the action of cam 51, lever 48' and slide rod 46' so as to rotate the lamp envelope about a transverse axis from the horizontal position to a vertical position and thereby completely invert the lamp through 180 from its initial vertical position.

After the lamp envelope 1 has been delivered to the intermediate position by the first transfer arm 22, the first transfer arm 22 is rotated about its longitudinal axis back through 90 to return the envelope holder 34 to its initial vertical position through the interaction of lever 48, cam 51' and slide rod 46. Simultaneously, the first transfer arm 22 is swung from its lamp delivery position to its lamp pickup position, the envelope engaging jaws 35 and 36 of the envelope holder 34 being held open by the action of the hydraulic cylinder 37. The first sealing machine 2 has meanwhile indexed one station during the above described movements of the first transfer arm from the time it received a lamp, and the turret 5 is presently in a dwell period. The envelope holder 34 will now engage the lamp that has been indexed to station Q to repeat the cycle of operation.

Upon delivery of the lamp envelope by the second transfer arm 23 to its delivery position at station C of the second lamp sealing machine 3, the lamp is delivered to the lamp holder 13 of the head 6' which at that time is located at the loading station C, the said holder 13 having been supplied at one or the other of the preceding two stations A or Bf with a lamp mount on the upper end of its spindle 12 for sealing into the remaining open end of the lamp envelope. The lamp is held vertically by the jaws 35' and 36' of the envelope holder 34', and is at the envelope loading station C of turret 5', the turret 5' being in a dwell period and the head 6' of the turret 5" being in position to receive the lamp. The jaws 14 and 15 of the holder 13 at station C are held in their open position against the bias of their retaining spring 17 which normally holds the jaws in the closed position, through the operation of a jaw-opening finger 58 which is carried by a vertically extending slide rod 59 and which on downward movement engages with and depresses the jaw-opening lever 18 of the holder. The slide rod 59 is vertically reciproeable in a bearing 60 mounted on a stationary portion of the machine framework and is pivotally connected at its lower end to one end of a horizontal-1y extending lever 61 which is pivoted intermediate its end on a bracket 62 mounted on themachine framework. At its other end, the lever 61 carries a roller 63 which rides on the periphery of an edge cam 64 mounted on the cam shaft 10.

When the lamp envelope 1 has been thus inserted by the second transfer arm into the holder 13 at station C of the second turret 5', the jaws 14 and 15 of the said holder are then closed against the envelope of the lamp by the elevation and disengagement of the jaw-opening finger 58 from the jaw-opening lever 18 of the holder which then allows the biasing spring 17 thereof to close the holder jaws 14, 15 against the lamp envelope 1 so as to grip and firmly hold it in place in the head 6'. With the lamp thus held by the holder 13 at station C, the jaws 35 and 36' of the transfer arm holder 34' are opened by the operation of the hydraulic cylinder 37 to release the lamp envelope 1 from the transfer arm holder 34', thereby completing the transfer and inversion of the lamp from the first sealing machine 2 to the second sealing machine 3. The second transfer arm 23 is then swung in a horizontal plane and rotated about its longitudinal axis back to its lamp pickup position in readiness for the next lamp transfer operation to receive another lamp envelope from the first transfer arm 22. Upon subsequent indexing of the second turret and positioning of the transferred lamp 1 at one of the ensuing stations (cg. station D) the lamp is moved downwardly in the holder 13, by suitable lamp pushdown mechanism (not shown, but similar to that at station D of the first sealing machine 2), into proper sealing relation with the lamp mount resting on the upper end of the spindle 13 of the head 6, with the open lower end of the lamp envelope abutting against the glass lower portion of the lamp mount. The lamp mount is then sealed to the lamp envelope in the customary manner by the conventional gas fires (not shown) located at the subsequent indexing station of the turret 5' after which the lamp is elevated, by mechanism similar to that at station P of the first turret 5, and then removed from the turret 5'. Another lamp mount is then placed in position on the spindle 13 of the empty head 6' in readiness for the next sealing cycle.

It will be seen that tubular lamp envelopes of substantial length, e.g., of about six or eight foot lengths, may have mounts automatically sealed in both ends thereof according to the present invention and that said lamps may automatically be inverted and delivered from a first lamp manufacturing machine to a second lamp manufacturing machine. Further, while one specific embodiment of the invention has been described, many modifications will occur to those skilled in the art. It is therefore to be understood that the invention is to be limited only by the claims annexed to and forming a part of this specification.

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

1. In combination with means to support vertically extending tubular lamp envelopes at an initial pick-up position and means to support said envelopes vertically at a final delivery position spaced horizontally from said pickup position, an inverting transfer mechanism comprising first and second horizontally extending transfer arms mounted for rotation about their respective longitudinal axes and for pivotal oscillation in a common horizontal plane about respective vertical axes spaced apart horizontally between said pick-up and delivery positions, envelope gripping means on the ends of said arms, means for actuating the gripping means on said first arm to closed position with the arm at said initial pick-up position to grasp an envelope thereat, means for pivotally oscillating said first arm in said common horizontal plane to an intermediate delivery position whereat it extends substantially normal to a-horizontal line joining the vertical pivot axes of the two arms, means for rotating said first arm 90 about its longitudinal axis during its oscillation so that the envelope held thereby extends horizontally at the intermediate delivery position of the arm, means for pivotally oscillating said second arm in said common horizontal plane, the lastnamed means holding said second arm, upon arrival of said first arm at its intermediate delivery position, in an intermediate pick-up position wherein it also extends substantially normal to the said line joining the vertical pivot axes of the two arms so that its gripping means is in alignment with the gripping means on the first arm and receives therein a portion of the envelope spaced from the portion gripped by the first arm, means for actuating the gripping means on said second arm to closed position with the second arm at said intermediate pick-up position to grasp the envelope therein, means for then actuating the gripping means on the first arm to open position to release its grip on the envelope, the means for pivotally oscillating said second arm being operable to then oscillate the second arm to the final delivery position, and means for rotating said second arm about its longitudinal axis during its oscillation to the final delivery position, the lastnamed means rotating the second arm in the same angular sense as said first arm to thereby complete inversion of the envelope through 2. In combination with means to support vertically extending tubular lamp envelopes at an initial pick-up position and means to support said envelopes vertically at a final delivery position spaced horizontally from said pick-up position and at substantially the same elevation as said initial pick-up position, an inverting transfer mechanism comprising first and second horizontally extending transfer arms mounted for rotation about their respective longitudinal axes and for pivotal oscillation in a common horizontal plane about respective vertical axes spaced apart horizontally between said pick-up and delivery positions, the said common horizontal plane of oscillation of said arms being at an elevation spaced substantially from the mid-point of an envelope supported at said initial pick-up and final delivery positions, envelope gripping means on the ends of said arms, means for actuating the gripping means in said first arm to closed position with the arm at said initial pick-up posi- A tion to grasp an envelope at a location to one side of its mid-point, means for pivotally oscillating said first arm in said common horizontal plane to an intermediate delivery position whereat it extends substantially normal to a horizontal line joining the vertical pivot axes of the two arms, means for rotating said first arm 90 about its longitudinal axis during its oscillation and in a direction such that the longer unsupported length of the envelope rotates away from the said initial pick-up position so that the envelope held thereby extends horizontally at the intermediate delivery position of the arm, means for pivotally oscillating said second arm in said common horizontal plane, the last-named means holding said secand arm, upon arrival of said first arm at its intermediate delivery position, in an intermediate pick-up position wherein it also extends normal to the said line joining the vertical pivot axes of the two arms so that its gripping means is in alignment with the gripping means on the first arm and receives therein a portion of the envelope spaced at the opposite side of the envelope mid-point from the portion gripped by the first arm, means for actuating the gripping means on said second arm to closed position with the second arm at said intermediate pick-up position to grasp the envelope therein, means for then actuating the gripping means on the first arm to open position to release its grip on the envelope, the means for pivotally oscillating said second arm being operable to then oscillate the second arm to the final delivery position, and means for rotating said second arm 90 about its longitudinal axis during its oscillation to the final delivery position, the last-named means rotating the second arm in the same angular sense as said first arm to thereby complete inversion of the envelope through 180".

References Cited in the file of this patent UNITED STATES PATENTS 1,524,067 Troutman et al. Ian. 27, 1925 2,540,378 Restetsky Feb. 6, 1951 2,731,668 Miner Jan. 24, 1956 2,763,098 Pennybacker et al. Sept. 18, 1956 2,811,267 Bock Oct. 29, 1957 2,821,810 Bullers et al. 'Feb. 4, 1958 2,823,815 Doron et al Feb. 18, 1958 2,844,917 Caldwell July 29, 1958

Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3182560 *Jan 15, 1963May 11, 1965Ensine CorpSizing stacked tiles and equipment therefor
US3225941 *Nov 18, 1963Dec 28, 1965Hill Rockford CoAutomatic assembling or transferring units
US3552582 *Apr 7, 1969Jan 5, 1971Netzsch MaschinenfabrikApparatus for inverting fragile articles
US3650002 *Mar 4, 1969Mar 21, 1972Kentucky Electronics IncMachinery for making crt electronic assemblies using two indexing tables
US4139104 *Jul 25, 1977Feb 13, 1979George MinkMaterial handling apparatus
US4770596 *Jul 1, 1986Sep 13, 1988Prima Industrie, S.P.A.Manipulator device particularly for handling metal sheets during folding operations
Classifications
U.S. Classification414/732, 414/774, 414/591, 198/403
International ClassificationH01J9/46
Cooperative ClassificationH01J2893/0096, H01J9/46
European ClassificationH01J9/46