High capacity envelope stacker apparatus

Abstract: A high capacity envelope stacker (100) accepts envelopes (8) from a source in a planar configuration, pivots each envelope individually on either of its long edge axis so that it is stacked on its long edge, and then restrains the envelope on its two faces so that the stack of envelopes as a whole are stacked 1 - N exactly as they arrive from the printer up to about 500 envelopes.

Description: This invention is directed to a stacker for stacking envelopes received from a machine that has placed images on the envelopes, and more particularly, to an envelope stacking apparatus that stacks envelopes on long edges thereof. An efficient and cost effective way to neatly stack a high capacity (more than 40 or 50) of envelopes exiting an imaging apparatus has not been found. Conventional envelope stackers have shown to be deficient in accomplishing this task. For example, when envelopes are stacked in a simple catcher box as shown in FIG. 1, they tend to fall sideways. This is because the envelope flap is slightly open and also forms three paper thicknesses on the same side which creates an unstable medium to stack. Also, individual envelopes alone are much more variable from style to style than paper, i.e., some stack better or worse than others. In addition, prior art stackers do not address the problem of the desirability of stacking envelopes 1 - N which would make the envelope match documents printed and stacked 1 - N. Simple catch boxes, as for example, in FIG. 1, which most low capacity stackers employ, are N - 1 stackers, so that the user must perform a very tedious manual inversion of the envelopes in order to make the envelope printing order match the letter order that must be inserted into the envelopes. Therefore, if possible, the imaged or addressed side of envelopes should be stored 1 to N as shown in FIG. 2. GB-A-401,929 discloses a stacking device in which sealed letters are received on a stacking plate with their short edge leading. Periodically, a stop plate halts the flow of letters and the plate is rotated so as to stack the letters accumulated thereon in a storage area with their short edges horizontal and long edges vertical. An object of the present invention is to provide a simple and cost effective envelope stacker. Therefore, the present invention provides an envelope stacker according to claim 1 of the appended claims. The invention further provides an evelope stacker according to claim 5 of the appended claims The invention further provides a printer according to claim 8 of the appended claims. Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which: FIG. 1 is a partial side view of a prior art envelope stacker; FIG. 2 is an exploded schematic showing envelopes stacked in 1 - N order; FIG. 3 is a schematic front view of the high capacity envelope stacker apparatus of the present invention attached to a conventional copier/printer; FIG. 4 is a partial, schematic isometric view of the high capacity envelope stacker apparatus of FIG. 3 showing the envelope flipping member actuated; FIG. 5 is a partial, schematic, isometric view of the high capacity envelope stacker apparatus of FIG. 3 with envelopes that have been flipped onto one of their long edges; FIG. 6 is a partial, schematic side view of an alternative embodiment of the high capacity envelope stacker apparatus of the present invention; and FIG. 7 is a partial, schematic side view of another alternative embodiment of the high capacity envelope stacker apparatus of the present invention showing a captive pin for rotating the flipper plate. The high capacity envelope stacker apparatus 100 of the present invention is used only part of the time an imaging apparatus, such as a printer, is in use. As such, it must be compact and unobtrusive from an appearance standpoint, and since it is not a dedicated part of the imaging apparatus, it must be inexpensive. Such an envelope stacker is shown in FIG. 3 as 100 connected to an exemplary printer 30, such as the Xerox 4045®, that includes an envelope feeder 10. Envelope feeder 10 is a high capacity (200 envelopes), gravity-fed, load-while-run (when a cover safety interlock is not used) apparatus which is adapted to be connected to a printer with a long dimension of the envelopes 8 placed against the end and short edge dimension of the printer for minimum footprint usage. The envelopes are inserted flap down within walls of bin 13. A planar bottom and envelope supporting portion of the bin has a relieved portion therein in the shape of an envelope flap that permits the flap of the lowermost envelope to extend thereinto. A motor and brackets support a picker blade by way of a shaft (not shown) for back and forth or oscillatory movement within a predetermined space along the bottom surface of bin 13. On demand, the blade (not shown) is rotated by the motor from a first or home position underlying bin 13 to a second position within printer 30. The picker blade sweeps each envelope sideways and pivots them from a short edge dimension to a long edge dimension within the printer between guides 52 and 53. Each envelope is then registered along its long edge with scuffer wheel 55 and fed out of the printer by feed rolls 60 into high capacity envelope stacking apparatus 100. High capacity envelope stacker 100 of the present invention in FIGS. 3 - 5 accepts envelopes from copier/printer 30 at about a 30° angle and comprises a catch tray having side walls 101 and 102 and end walls 103 and 104 with the catch tray being divided into an envelope receiving compartment 120 and an envelope storage compartment 110. The two compartments are separated by a slidable partition 113 and compartment 120 has a bottom shelf 121. Brush-like snubbers 118 are positioned on opposite sides of walls 101 and 102 for reasons that will be explained hereinafter. A movably pivoting flipper plate 122 is positioned within compartment 120 and mounted by hinge 123 to be rotated through an arc of 90° from a position on top of bottom receiving shelf 121 past snubbers 118 by an actuator disc 125 driven by a motor (not shown). Actuator disc 125 is connected to pivoting flipper plate 122 by an eccentrically mounted link 126. In operation, envelopes exit the output or right end of copier/printer 30 as viewed in FIG. 3, at an angle of approximately 30° in the direction of arrow A of FIG. 4 and are received in receiving compartment 120 and coming to rest on flipper 122. Envelopes pass a photosensor 40 in the exit path of copier/printer 30 which includes an emitter 41 and a detector or receiver 42. The software of copier/printer 30 is designed such that a signal from sensor 40 that an envelope has passed that station is sent to the onboard computer of the copier/printer. After a predetermined delay, to allow the envelope to come to rest in the stacker on flipper plate 122, a signal is sent from the computer to actuate the motor that turns actuator disc 125 one revolution. This acts on link 126 which pivots flipper plate 122 90°. Flipper plate 122 in turn rotates the envelope thereon 90° past brush snubbers 118 until the envelope is captured between the brush snubbers and slidable partition 113. As this operation is repeated for each individual envelope, slidable partition 113 moves in the direction of arrows B to the left of FIGS. 4 and 5 in small incremental steps so that a force to sufficiently orient the envelopes vertically (on a long edge dimension thereof) is always maintained. After a run is completed, the operator pushes the partition further to the left, grasps the stack of envelopes with one hand extending through relieved or cut-out area 105 and the other at the exposed end of the envelopes adjacent brush snubbers 118 and pulls them from the storage compartment for deposit in another area. Slidable partition 113 is then manually returned to the extreme right end of the storage compartment adjacent brush snubbers 118. It should be understood that a spring could be used to automatically return the slidable partition to this home position, if desired. The resultant stacked envelopes from this operation are stacked (image side) 1 - N which is the desired sequence since copy sheets that are to be inserted into the envelopes are usually stacked 1 - N. The advantages of this stacker apparatus over prior envelope stackers include the 1 - N order integrity; low-complexity; low unit manufacturing cost; user friendliness and safe operation. An alternative embodiment of the high capacity envelope stacker in accordance with the present invention is shown in FIGS. 6 and 7 in which like numbers represent like elements of FIGS. 3 - 5. In FIG. 6, envelopes 8 enter stacker 150 and rest flap side down on top of flipper plate 122 which is parallel to bottom shelf 153. When motor pulley 160 is actuated by a signal from the stacker logic circuit (not shown), disc 155 is rotated by belt 161 in the direction of arrow D for one revolution for each envelope and pin 156 that is attached to disc 155 lifts flipper plate 122 which is spring loaded down and envelope 8 past brushes 118 onto a long edge thereof and against stopper plate 170. As the process continues for each incoming envelope, the action of flipper plate 122 pushes the envelopes and movable support 154 along rails or tubular slides 111 in the direction of arrows B toward end member 152 and away from end member 151. The stacker apparatus of FIG. 7 is the same as that shown in FIG. 6 except that pin 156 is shown captured within a bracket 130 connected to the underside of flipper plate 122. As a result, rotation of disc 155 causes pin 156 to ride within bracket 130 to thereby raise and lower flipper plate 122 in order to stack incoming envelopes.

Claims: An envelope stacker apparatus comprising a receiving compartment (120) for receiving a plurality of envelopes (8) flap side unexposed, short edge leading, and for supporting the envelopes in a first, substantially non-vertical position, and a storage compartment (110) for storing envelopes in a stack in a second, vertical position, with the last envelope in the stack having its flap side exposed; wherein said receiving compartment (120) includes means (122-126) for moving the envelopes from said first position to said second position; characterised in that said moving means (122-126) is adapted to move the envelopes (8) upon being received in said receiving compartment (120), such that the envelopes are stacked in said storage compartment (110) individually in sequence, and in that in said second position said envelopes (8) have their short edges vertical. The envelope stacker apparatus of claim 1, including slidable partition means (113) for separating said receiving compartment (120) from said storage compartment (110), and wherein said slidable partition means (113) is mounted on rails and adapted to be pushed incrementally along said rails by said means (122-126) for moving the envelopes (8) from said first position to said vertical second position. The envelope stacker apparatus of claim 1 or 2, wherein said means (122-126) for moving the envelopes (8) from said first position to said vertical second position includes a pivotable flipper plate (122), said flipper plate being connected to an actuator disc (125) such that each revolution of said disc lifts said flipper plate (122) from said first position to a vertical position with said flipper plate returning to said first position due to gravity. The envelope stacker of claim 1, 2 or 3, wherein said catch tray is adapted to convert envelopes (8) stacked therein N - 1 to 1 - N before removal therefrom by an operator. An envelope stacker apparatus, comprising: a catch tray (101-104); means (113) dividing said catch tray into a receiving compartment (120) and a storage compartment (110), said receiving compartment (120) being adapted to receive envelopes (8) short edge leading, and said storage compartment (110) being adapted to receive envelopes long edge leading; and means (122-126) for individually and separately converting envelopes (8) after each envelope is received in said receiving compartment (120) from an initial horizontal position to a substantially vertical position and individually stacking them in said storage compartment (110), thereby forming a stack of envelopes in 1-N order. The envelope stacker apparatus of claim 5, including slidable partition means (113) for separating said receiving compartment (120) from said storage compartment (110), and wherein said slidable partition means (113) is mounted on rails and adapted to be pushed incrementally along said rails by said converting means (122-126). The envelope stacker apparatus of claim 5 or 6, wherein said converting means (122-126) includes a pivotable flipper plate (122), said flipper plate being connected to an actuator disc (125) such that each revolution of said disc lifts said flipper plate (122) from a first position holding the envelopes (8) in N - 1 order to a vertical position in order to position the envelopes in said 1 - N order with said flipper plate (122) returning to said first position due to gravity. A printer adapted to print images onto envelopes, comprising: an imaging apparatus (30); an envelope feeder (13) adapted to feed envelopes (8) into the printer for imaging by said imaging apparatus; and an envelope stacker apparatus according to any of the preceding claims.

Inventors: ZOLTNER JOHN D, ZOLTNER, JOHN D.
Applicants: XEROX CORP, XEROX CORPORATION
Application year: 1993
Main classification: B65H29
IPC codes: B65H15, B43M5, B65H29, B65H31