Tray flip unloader

Abstract

A mailpiece transfer apparatus uses a transfer box to unload a plurality of mailpieces from an open tray, while maintaining an orientation alignment of the flat items. The tray is placed in the transfer box, after which the transfer box, holding the tray, is rotated to cause the mailpieces to rest against a cover of the transfer box. The tray is then removed, and the transfer box rotated again, allowing the substantially flat items to rest against a bottom of the transfer box, but without the tray. The mailpieces are then guided to a next workstation. The mailpieces may be edged for delivery to the next workstation.

Claims

1. Material handling apparatus capable of transferring a plurality of substantially flat items, while maintaining an orientation alignment of the substantially flat items, the apparatus comprising: means for receiving the substantially flat items in an open container; means for transferring the substantially flat items from the open container to an unloader box by placing the open container into the unloader box, rotating the unloader box to an at least partially inverted position and removing the open container from the unloader box with the unloader box in the inverted position; means for returning the unloader box to a non-inverted alignment, while retaining the substantially flat items in the unloader box; means for guiding the substantially flat items from the unloader box to a next work station; means for providing a desired edge alignment along two adjacent edges of the plurality of items, the means for providing the edge alignment acting upon the plurality of items within the unloader box; and means for causing the plurality of substantially flat items to exit the unloader box while maintaining the original orientation alignment of the substantially flat items.

2. The apparatus of claim 1, further comprising: the means for transferring configured to discharge the open container by removing the open container from a receiver; a material shifter the means for transferring further configured to move the substantially flat items from the receiver while maintaining the orientation of the flat items relative to one another.

3. The apparatus of claim 2, further comprising: the receiver comprising an unloader box adapted to receive the open container and, after receiving the open container, invert with the open container with the substantially flat items contained within the unloader box; an open container discharge mechanism to remove the open container while in the inverted position, while leaving the substantially flat items in the unloader box; a mechanism to rotate the unloader box to a non-inverted position while retaining the substantially flat items in the unloader box; and a guiding mechanism to guide the substantially flat items from the unloader box to a next work station, while maintaining an orientation alignment of the substantially flat items.

4. The apparatus of claim 3, further comprising: the unloader box comprising a top portion capable of opening with respect to a remaining portion of the unloader box by receiving the open container holding the items in the unloader box with the top portion opened and with the plurality of items exposed within the unloader box at the open top portion of the unloader box, positioning the open container within the unloader box with the unloader box closed, thereby covering the open top of the open container.

5. The apparatus of claim 4, further comprising, a set of rollers with the rollers extending along providing on a bottom portion of the unloader box in a lengthwise direction of the unloader box perpendicular to an orientation of the plurality of items, the rollers positioned to allow the plurality of items to rest edgewise against the rollers; and a motor drive causing the rollers to rotate, thereby urging the plurality of items toward one side of the unloader box in an edge alignment against said one side of the unloader box.

6. The apparatus of claim 2, further comprising, an edger acting upon the plurality of items to achieve a desired edge alignment in order to discharge the plurality of items in the desired edge alignment along two adjacent edges, to achieve or maintain a desired edge alignment of the plurality of items within the guiding mechanism.

7. The apparatus of claim 6, further comprising: an edger acting on the plurality of items to achieve or maintain a desired edge alignment of the plurality of items along two adjacent edges during movement by the material shifter.

8. The apparatus of claim 2, further comprising: an edger acting on the plurality of items to achieve or maintain a desired edge alignment of the plurality of items along two adjacent edges during movement by the material shifter.

9. The apparatus of claim 1, further comprising, the means for providing the edge alignment acting upon the plurality of items to achieve or maintain a desired edge alignment of the plurality of items along two adjacent edges.

10. Material handling apparatus capable of transferring a plurality of substantially flat items, the apparatus comprising: a receiver configured to receive the substantially flat items in an open container; a transfer mechanism configured to transfer the substantially flat items from the open container to an unloader box by placing the open container into the unloader box, rotating the unloader box to an at least partially inverted position and removing the open container from the unloader box with the unloader box in the inverted position and to return the unloader box to a non-inverted alignment, while retaining the substantially flat items in the unloader box; a guide mechanism configured to guide the substantially flat items from the unloader box to a next work station and to act upon the plurality of items within the unloader box to achieve a desired edge alignment along two adjacent edges of the plurality of items; and a discharge mechanism configured to cause the plurality of substantially flat items to exit the unloader box while maintaining the original orientation alignment of the substantially flat items.

11. The apparatus of claim 10, further comprising: receiver configured to receive, as the open container, a tray having a bottom and sidewalls fixed to the bottom and an open top, and providing the plurality of items in the tray with the plurality of the items having an initial alignment; the unloader box having a top portion capable of opening with respect to a remaining portion of the unloader box, wherein: the unloader box receives the substantially flat items by receiving the tray holding the items in the unloader box with the top portion opened and with the plurality of items exposed within the unloader box at the open top portion of the unloader box and positioning the tray within the unloader box with the unloader box closed to cover the open top of the tray; the unloader box rotates to position the open top of the tray in a generally downward facing orientation; the unloader box opens to expose the tray, with the open top of the tray facing in the generally downward facing orientation; and the unloader box retains the plurality of items for subsequent discharge after removal of the tray from the unloader box; the unloader box having a top portion capable of opening with respect to a remaining portion of the unloader box, the unloader box receiving the substantially flat items by receiving the tray holding the items in the unloader box with the top portion opened and with the plurality of items exposed within the unloader box at the open top portion of the unloader box with the tray positioned within the unloader box with the unloader box closed to cover the open top of the tray.

12. The apparatus of claim 11, further comprising: receiver configured to receive the tray holding the items in a manner whereby the plurality of items shift forward in the tray to create a gap between the items and one end of the tray.

13. The apparatus of claim 11, further comprising: a prod to urge the plurality of items away from one end of the tray, thereby causing the plurality of items shift forward in the tray to create a gap between the items and one end of the tray.

14. The apparatus of claim 11, further comprising: a guide insertable between the plurality of items and the end of the tray prior to removing the tray from the unloader box.

15. The apparatus of claim 14, further comprising: the guide comprising a comb formed paddle inserted between the plurality of items and the end of the tray.

16. The apparatus of claim 11, wherein the plurality of items comprise a batch of postal mail, having an alignment established by a face side and position of an address or an address barcode.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a diagram showing, a flip unloader open on one end to allow the entrance of the trays.

(2) FIG. 2 is a diagram depicting a decline slide.

(3) FIG. 3 is a diagram depicting the decline slide and a transition slide.

(4) FIG. 4 is a diagram of an edger apparatus.

(5) FIGS. 5-7 are diagrams depicting a tray received by a flip unloader box.

(6) FIGS. 8 and 9 show the flip unloader box closing over the tray.

(7) FIG. 10 is a diagram showing rotation of the flip unloader.

(8) FIG. 11 is a diagram depicting the flip unloader rotated past a horizontal position and on a slight incline.

(9) FIG. 12 is a diagram depicting the flip unloader box opening to expose the bottom of the tray.

(10) FIGS. 13-16 are diagrams showing the use of vacuum to lift the tray clear of a mail slug and move the tray to the empty tray discharge chute.

(11) FIG. 17 is a diagram depicting release of the mail tray for discharge.

(12) FIG. 18 is a diagram depicting the flip unloader box closing over the mail slug.

(13) FIG. 19 is a diagram depicting the flip unloader box rotating prior to alignment with the decline slide.

(14) FIG. 20 is a diagram depicting the flip unloader stopped 45 degrees past horizontal, interfacing with the decline slide.

(15) FIGS. 21 and 22 are diagrams showing engagement of the comb paddle with the mailpieces in the flip unloader.

(16) FIG. 23 is a diagram depicting the lid comb passing through the decline slide comb, transferring the mail slug to the decline slide comb.

(17) FIGS. 24-30 are diagrams depicting movement of the mail slug as guided by the combs.

(18) FIGS. 31-35 are diagrams depicting the operation of the transition slide and feed table.

(19) FIGS. 36 and 37 are diagrams depicting edging of mail within the flip unloader.

(20) FIG. 38 is a diagram depicting edging of mail moving down the decline slide from the unloader box.

(21) FIG. 39 is a diagram depicting the use of rolling tubes in the flip unloader edging of mail within the flip unloader.

(22) FIGS. 40 and 41 are diagrams showing the relationships of the components in plan and side (elevation) views.

DETAILED DESCRIPTION

(23) Overview

(24) The device automatically performs the following functions:

(25) Confirm proper tray orientation, and reorient or reject improperly orientated trays.

(26) Load the unsleeved tray into the flip unloader.

(27) Remove the mail from the tray.

(28) Automatically edge mail to be presented to the feeder/singulator.

(29) Maintain control of the mail slug.

(30) Transfer the mail slug to the input of the feeder/singulator.

(31) Establish and maintain the integrity of the mail slug facing and edging during and after transfer.

(32) The trays are provided at an elevation above the feeder/singulator. A decline slide is used to bring the mail down to the feeder/singulator, and the slide is easily moved to allow operator access to the feeder/singulator when manual processing is required.

(33) Physical Description

(34) It is desired that the manual feed operations of the feeder/singulator remain accessible. This requires that a flip unloader be easily moved to allow access to the feeder/singulator for manual operations. Placing the flip unloader above the feeder/singulator satisfies this requirement. The trays are transported to the flip unloader by an overhead conveyor, and then the mail slugs are transferred to the feeder/singulator's operational level.

(35) FIG. 1 is a diagram showing a mail transfer apparatus 101. Mail transfer apparatus 101 includes a flip unloader 111 mounted above a decline slide 115 to transfer the mail in slugs to an in-feed table at a feeder/singulator such as a delivery barcode sorter (not shown). A transition slide (316, shown in FIG. 3) at the bottom of decline slide 115 returns the mail to the horizontal plane for transfer to the feeder/singulator feed table. In addition, because proper edging of the mail is desired for proper feeding of the feeder/singulator, the apparatus 101 is configured to assure that the mail is edged. The apparatus 101 therefore comprises flip unloader 111, straight decline slide 115 and transition slide 316.

(36) As depicted in FIG. 1, flip unloader 111 is a receiver including a box 121 and lid 122, and is of a size and shape to contain a tray 131. Flip unloader 111 is open on one end 141 to allow the entrance of the trays. The top of box 121 is covered by lid 122 attached to the box through a hinge 145. The box is connected to the frame through a pivot shaft on the same end of the box as hinge 145. While slant edge trays are depicted, it is also possible to use other tray configurations, such as trays having squared edges and trays with hand holes.

(37) FIG. 2 depicts decline slide 115 and FIG. 3 depicts transition slide 316. Transition slide 316 in turn connects to feed table 321. As depicted in FIGS. 2 and 3, the decline and transition slides 115, 316 are modules which are formed from multiple tubes 227, 327 placed in the proper configuration to support mail slugs 230 during transfer operations. Decline slide 115 is mounted at an angle of approximately 45 degrees, which provides excellent control of the mail, and gravity provides the motive force to advance the mail slug 230. Decline slide 115 includes decline slide frame 250 to which are mounted decline support side rails 251, which assist in edging the mail slug 230.

(38) Support combs, such as leading decline slide comb 237, leading transition slide comb 337 and trailing transition slide comb 339, are used to control the transfer of the mail slugs 230. Combs 237, 337 and 339 are shown positioned above the respective decline and transition slides 115, 316; however, the combs may be mounted below or above the slides 115, 316. Transition slide combs 337, 339, mounted through a common pivot point 341, control the transfer of the mail slug 230 through transition slide 316, returning the mail to the horizontal plane defined by a floor plate 352 floor of feed table 321.

(39) FIG. 4 depicts edging rollers 429 forming three lagged rollers. Edging rollers 429 are placed in the bottom of a slide positioned approximately 45 degrees from the horizontal, and mounted perpendicular to the direction of mail travel. A small motor 247 provides power to the tubes, which are interconnected via a belt drive (not shown). As the mail passed over edging rollers 429, the mail is urged to move against decline support side rails 251. This urging against side rails 251 assists in edging the mail.

(40) The edging can occur at flip unloader 111, on decline slide 115, on another portion of the pathway or in any combination of these locations. One advantage of using flip unloader 111 for edging is that the mail is generally able to move more freely within flip unloader 111, so that edging can take place on a more consistent basis. Providing additional edging on decline slide 115 compensates for a possible tendency for mail in the mail slug 230 to shift away from its edged condition.

(41) An advantage of the use of tubes, such as tubes 227 as bottom supports for the mail slugs 230 is that the tubes allow mailpieces to drop through. In the case of mail in slugs 230, this would not occur, but if a mailpiece becomes separated from the slug 230, it is likely to drop past the tubes 227 rather than remaining in the operational path of the mail transfer apparatus 101. This separated mail can include mail which ends up in the trays 131 in the lengthwise orientation of the tray. The ability of improperly oriented mail to fall through the tubes 227 reduces the possibility that such stray mailpieces will get mangled or possibly jam the mail sorting equipment as a result of a misfeed. The stray mailpieces may then be retrieved from the floor or a catch tray (not shown) and placed back in the mail sorting line.

(42) Tray Unloading

(43) In an example operating environment, the trays 131 are diverted to a feeder/singulator spur. The trays 131 are provided unsleeved and in proper orientation.

(44) The apparatus 101 works equally well with full and half trays 131. Only depictions of processing full trays 131 are included in this section for brevity.

(45) As depicted in FIGS. 5-9, unsleeved trays 131 enter the flip unloader box 121. At that time, flip unloader 111 is positioned on an incline to receive trays 131. As one of the trays 131 enters, the mail is shifted forward, opening a space 611 between the uphill end of tray 131 and the mail slug 230.

(46) As depicted in FIGS. 9 and 10, box 121 rotates approaching lid 122. As flip unloader 111 continues to rotate, a comb paddle 721 mounted to lid 122 enters the space 611 between the tray 131 and the mail. Hand hole 914 can be used to assist by allowing a side prod 916 to press against the mail to establish space 611. Tray 131 typically is loaded so that space 611 would occur as a result of the tilt of tray 131; however, the provision of hand hole 914 allows the prod to press the mail to establish the space 611.

(47) Referring to FIG. 10, the closed flip unloader 111 continues to rotate, passing horizontal and stopping on a slight incline, as depicted in FIG. 11. At this point, flip unloader box 121 is inverted.

(48) As depicted in FIG. 12, the flip unloader box 121 opens, exposing the bottom of the tray 131. In FIGS. 13 and 14, a vacuum head 1311 rotates into position on top of the tray 131.

(49) As depicted in FIGS. 14-16, the tray 131 is lifted clear of the mail slug 230 and moved to empty tray discharge chute 1613. The vacuum is disabled releasing mail tray 131, depicted in FIG. 17.

(50) As depicted in FIG. 18, the flip unloader box 121 closes over the mail slug (230, not shown in FIG. 18). After flip unloader 111 is closed, the tray lid comb (721, not shown in FIG. 18) is indexed, securing the mail slug 230 between comb 721 and the flip unloader box 121, and also securing the mail in an edged condition. As depicted in FIGS. 19 and 20, flip unloader 111 rotates, stopping 45 degrees past horizontal, interfacing with decline slide 115. Flip unloader 111 at this time is generally in an upright alignment corresponding to the initial alignment, but at a different angle from the horizontal from that of the initial alignment. Thus, if the initial alignment (e.g., FIG. 1, 6 or 7) has the flip unloader box 121 tilted in an incline direction to allow the tray to enter, the alignment of flip unloader 111 interfacing decline slide 115 may be different. This is particularly true if, as depicted, the direction of movement of the tray is opposite that of the direction of movement of the mail when exiting flip unloader 111. The alignment of flip unloader 111 is also used to provide edging of the mail, so that, on discharge, the edged side of flip unloader 111 may be lower than the side that is not edged.

(51) It is alternatively possible to leave the mail slug 230 inverted, in which case, the mail is discharged from the flip unloader 111 after the tray 131 is removed but without flipping the flip unloader 111 back to the upright position. This requires that subsequent handling either re-orient the mail or subsequent processing equipment accept the mail in an inverted orientation.

(52) Movement of Mail From Flip Unloader

(53) FIGS. 21 and 22 show the engagement of comb paddle 721 with the mailpieces in flip unloader 111. Referring to FIG. 23, as the comb paddle 721 swings upward with lid 122, mail slug 230 is transferred to decline slide 115. As depicted in FIGS. 22 and 23, comb paddle 721 passes through the decline slide comb 237, transferring the mail slug 230 to decline slide comb 237. Decline slide comb 237 permits the mail slug 230 to descend down decline slide 115 in a controlled manner. By descending in a controlled manner, the mailpieces are prevented from scattering.

(54) FIGS. 24-29 depict the movement of the mail slug 230 as guided by the combs. In FIGS. 24 and 25, after the mail slug 230 is transferred to decline slide comb 237, lid comb 721 is retracted with lid 122. In FIG. 26, the decline slide comb 237 moves down the decline slide 115 toward second decline slide comb 2637. The angle of decline slide 115 and gravity maintain the integrity of the slug. Decline slide comb 237 passes through a second decline slide comb 2637 transferring mail slug 230. In FIG. 27, decline slide comb 237 is retracted through the bottom of decline slide 115. In FIGS. 27-29, the mail slug 230 continues down decline slide 115 supported by second decline slide comb 2637.

(55) Transition Slide and Feed Table

(56) FIGS. 30-36 depict the operation of transition slide 316 and feed table. As depicted in FIGS. 31-36, the mail slug 230 is transferred to leading transition slide comb 337 (also depicted in FIG. 3). Second decline slide comb returns 2637 and moves into position behind mail slug 230. As can be seen in FIG. 32, leading transition slide comb 337 and a trailing decline slide comb 339 move in unison to control mail slug 230. In FIG. 31, trailing transition slide comb 339 replaces second decline slide comb 2637 for the transfer through the curve defined by transition slide 316. Both transition slide combs 337, 339 move in unison to transfer and control mail slug 230. As can be seen in FIG. 33, the leading transition slide comb 337 moves past feed table comb 3341, transferring control of mail slug 230.

(57) In FIG. 34, the lead transition slide comb 337 retracts. As depicted in FIG. 35, the feed table comb 3341 and trailing transition slide comb 339 move in unison to control the mail slug 230 and effect the transfer to feed table 321.

(58) Inverting and Edge Alignment

(59) Properly edged mail is critical to the performance of the feeder/singulator. It is expected that at times the mail will not be properly edged in the tray. As a result the mail exiting flip unloader 111 will be improperly edged. Automatic mail edging is used to edge the mailpieces. The edging is performed while in the flip unloader box 121, immediately after discharge from the flip unloader box 121 or as the mail is being transferred through the slides. This may be performed by a number of techniques, including gravity, motion and vibration.

(60) The act of inverting the mail in flip unloader 111 back to the upright position after removal of the tray 131 (FIGS. 18-20) has a small but measurable impact on the edge alignment of the mail. It is possible to minimize the edge misalignment during unloading by tuning the apparatus 101, but it was determined that there will need to be some edge alignment improvement mechanisms incorporated into the system. In one example, edge alignment is established in flip unloader 111 portion of the machine. The result is that the mail is edged along two adjacent edges. Once the mail slug 230 is properly edged and aligned, the slug can be transferred along decline slide 115 without degradation.

(61) Occasional mail piece errors may occur in flip unloader 111 and there are designs that will make many of these errors self correcting. For example, mail that is placed sideways in the tray will fall between the tubes of decline slide 115 and be collected and contained in a trough. No operator invention would be required for this error.

(62) Mail slug transfers on decline slide 115 work smoothly. The multi-rail design of the decline slide structure has inherent advantages and allows for the slug control combs to pass through the structure and move as required. In one example, the slug support combs will be at a slight angle to aid in controlling the slug as it moves along decline slide 115.

(63) FIGS. 36-39 depict the mail edger operation within the flip unloader 111 and on decline slide 115. In FIG. 36, mail moves down the flip unloader box 121. In FIG. 37, the mail shifts as a result of gravity edge against vertical side 3705 of flip unloader box 121. FIG. 39 shows a modified flip unloader box 3921 in which edging is performed.

(64) FIG. 38 is a diagram depicting edging of mail moving down decline slide 115 or in flip unloader 121. As the mail slug 230 moves on decline slide 115, edging rollers 429 rotate to urge the mail against decline slide support rails 251 on decline slide 115, as described above in connection with FIG. 4. Edging rollers 429 are positioned at a slightly shallower angle than tubes 227, with the upslope ends of edging rollers 429 slightly below the level of tubes 227. This allow the mail to smoothly transition onto edging rollers 429. It is also possible to provide a taper at the lead ends of tubes 227, which would allow the mail to pass the lead edges of tubes 227 without catching on the lead edges.

(65) FIG. 39 is a diagram depicting the use of rolling tubes in the flip unloader box 3921, used for edging of mail within the flip unloader. A plurality of rollers 3929 are located in the bottom flip unloader box 3929. When the mail 230 rests against rollers 3929, the rollers urge the mail to one side of box 3929. Rollers 3929 are rotationally driven by motor 3947, either continuously or during a part of the rotational operation of flip unloader when the mail 230 rests against rollers 3929.

(66) Box 3921 may be open between rollers 3929, leaving open space as depicted at 3951. The open space 3951 facilitates discharge of mail not in the slug, and the stray mailpieces may then be retrieved from the floor or a catch tray (not shown) and placed back in the mail sorting line.

(67) The edging may therefore be performed in flip unloader box 121 against side 3705 or along decline slide 115, or elsewhere. Alternatively, the edging may take place at multiple locations.

(68) As mail slug 230 is transferred along decline slide 115 it has been found that the integrity of the slug is best maintained if the tines of the support combs are at a slight angle. This angle helps maintain the mail slug 230 against the decline slide support rails 251 on decline slide 115. As mail slug 230 is transferred from decline slide 115 to the horizontal feed table 321, the tines of the combs (e.g., combs 339, 3341, shown in FIG. 35) work best when perpendicular.

(69) Basic Configuration

(70) The basic configuration of flip unloader 111 may include

(71) flip unloader 111 with edging;

(72) decline slide 115 to transition slide 316;

(73) transition slide 316 to feed table transfer; and

(74) feed table transfer from transition slide 316 to the feeder/singulator.

(75) Modalities

(76) In the process of developing any new technology, there is a fair amount of trial and error that leads to further development and retrial. Each step in the maturation of the concept provides a learning experience on what works and what does not work. Overall, there are always some major revelations, or lessons learned, that form the foundation of the design process; those are presented here.

(77) In order to automate the unloading and feeding of letter mail in the trays, some standards are enforced to govern the preparation of mail in the tray. As in any process automation, some boundaries need to be defined in regard to the input. Typically product orientation and size are controlled at the input to an automated industrial process. In the case of flip unloader 111, it is often specified that the letter mail in the tray be of proper orientation (correct facing and standing on edge) and of the proper size (quantity of mail in the tray); this in order to maximize the unloading efficiency.

(78) Space Requirements

(79) In order to minimize the floor space occupied by mail transfer apparatus 101, as much of the hardware as possible may be ceiling supported. Floor supports may be tucked against the feeder/singulator machine wherever possible or outriggers are erected without inhibiting machine access.

(80) FIGS. 40 and 41 are schematic diagrams showing the relationships of the components in plan and side (elevation) views. In this example configuration, the apparatus 101 is located to receive trays from above the feeder/singulator, with the tray flip unloader 111 located substantially above the floorspace, and decline slide 115 and transition slide 316 feeding down to the feeder/singulator.

(81) Also shown is a tray discharge cart 4013 that receives empty trays from tray discharge chute 1613. In the case of slant edged trays (trays 131), the trays, upon dropping into discharge cart 4013 will possibly nest (not shown). If the trays are straight edged, then the trays can be stacked in discharge cart 4013 without nesting.

(82) Design Factors

(83) Mail manipulation on the feeder/singulator feed table requires overtaking a moving target (the mail already on the feed table moving toward the singulator) with the mail being introduced from the mail transfer apparatus 101. Presently, the operator performs this function using two hands and the feeder/singulator feed paddle. The design of the present apparatus duplicates the operator's manipulations with automated comb/paddle replacements. The feed rate is feeder/singulator paced so the automated function is quick, smooth and precise.

(84) As was discussed in a previous section, mail that has been unloaded from a tray will almost always require edge alignment. It is expected that this function will be performed in the flip unloader box 121. Automatic edge alignment is integrated into the design of the mail transfer apparatus 101. An operator presently utilizes a vibratory device and his hands to jog and align the mail piece edges. In automatic operation, the end over motion coupled with rotational urging will align the mail against the side wall and bottom of the flip unloader box 121 or on the decline slide 115.

(85) In addition to the mail processing requirements for the mail transfer apparatus 101, there are additional motions associated with jam clearing and tray rejects. The design allows for the feeder/singulator to be operated via manual feed with an operator. This requirement demands that the flip unloader device be moved out of the way for operator access to the sorter.

(86) In order for the feeder/singulator to be used for sequencing or other manual sorting, there is the need for the mail transfer apparatus 101 to be stowed or retracted or otherwise moved out of the way for an operator to manual feeding. The motions of the flip unloader box 121 and lid 122 have independent functions that are capable of working in unison. These motions include flip unloader box 121 rotation in both directions with at least six different stop positions and lid open to three different positions and close. The flip unloader 111 may include a full tray or half tray or may be empty so the movements may be smooth with a variable load. In addition, the mass of a lid actuator for lid 122 will be part of the load reflected to the flip unloader's prime mover.

CONCLUSION

(87) It will be understood that many additional changes in the details, materials, steps and arrangement of parts, which have been herein described and illustrated to explain the nature of the subject matter, may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims.