Source: http://www.google.com/patents/US5158183?ie=ISO-8859-1&dq=6181294
Timestamp: 2014-03-15 09:44:30
Document Index: 670524469

Matched Legal Cases: ['art 64', 'art 64', 'art 64', 'art 64', 'art 64', 'art 64', 'art 64']

Patent US5158183 - Buffer system for the temporary storage of flat objects such as letters, and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA buffer system for the temporary separate storage of flat articles such as letters for sorting, video coding or other postal processing, uses a buffer which acts as a mechanical RAM and contains a number of storage pockets for separate storage of articles. A conveyance system is provided by elastic...http://www.google.com/patents/US5158183?utm_source=gb-gplus-sharePatent US5158183 - Buffer system for the temporary storage of flat objects such as letters, and buffer for use in said buffer systemAdvanced Patent SearchPublication numberUS5158183 APublication typeGrantApplication numberUS 07/609,586Publication dateOct 27, 1992Filing dateNov 6, 1990Priority dateNov 17, 1989Fee statusLapsedAlso published asCA2029837A1, CA2029837C, DE69026794D1, DE69026794T2, EP0429118A1, EP0429118B1Publication number07609586, 609586, US 5158183 A, US 5158183A, US-A-5158183, US5158183 A, US5158183AInventorsJohannes H. M. Beerman, Harro M. V. Leijenhorst, Jan F. Suringh, Frank P. Van PomerenOriginal AssigneeKoninklijke Ptt Nederland N.V.Export CitationBiBTeX, EndNote, RefManPatent Citations (12), Non-Patent Citations (2), Referenced by (8), Classifications (20), Legal Events (8) External Links: USPTO, USPTO Assignment, EspacenetBuffer system for the temporary storage of flat objects such as letters, and buffer for use in said buffer systemUS 5158183 AAbstract A buffer system for the temporary separate storage of flat articles such as letters for sorting, video coding or other postal processing, uses a buffer which acts as a mechanical RAM and contains a number of storage pockets for separate storage of articles. A conveyance system is provided by elastic clamping on an endless conveyor. The conveyance system is separately controllable in the storage pockets as a letter catchment, retainment and ejection device. Buffers are situated along a branching feed section. Letter logging signals are transmitted for every letter conveyed along the feed section and run in parallel with the branched feed section. These signals in all cases include a letter identification code assigned when the letter is fed into the system. At that stage an application control continuously makes a selection of letters which are eligible for discharge from the system. The system can readily be equipped either as a sorting system or as a video coding system.
We claim: 1. Buffer systems for carrying out a buffer process comprising feeding flat objects, such as letters, provided with scannable symbols, in an unordered sequence, temporarily storing them and discharging them in an ordered sequence, which buffer system comprisingstorage means for temporarily storing the objects fed in, a means feed track along which the objects are fed from a system inlet in the direction of the storage means, a main discharge track along which the objects are discharged from the storage means in the direction of a system outlet, system control means for controlling the carrying out of the buffer process, object signalling means incorporated at the system inlet which send object signals to the control means via an object signal connection from each object fed via the system inlet, the system control means comprising storage control means for controlling the storage means, process control means for receiving the object signals and for continuously determining which objects are fed, stored and discharged, first and second process signal connections which connect the process control means to the storage control means; characterized in that the storage means include a number of parallelly ordered storage locations for receiving, temporarily retaining and ejecting every object individually; the process control means including means forassigning an object identification code to each object on receiving the associated object signals, compiling object logging signals and transmitting them via the first process signal connections, which object logging signals contain the object identification code of an object which has to be stored, receiving storage indication signals via the first signal connections, which storage indication signals contain the object identification code for each stored object, and compiling process control signals and transmitting them over the second process signal connections, which process control signals contain the object identification code of each object which has to be discharged, and the storage control means includes means for causing objects to be stored in the storage means in an individually identifiable manner on receipt of object logging signals received via the first process signal connections, and compiling the storage indication signals and transmitting them via the first signal connections to the process control means, and causing stored objects to be discharged on the basis of the process control signals received via the second process signal connections. 2. Buffer system according to claim 1, characterized in thatthe storage means comprise a number of buffers which are each provided with a buffer feed track connected to the main feed track, a number of individually controllable buffer pockets, and a buffer discharge track connected to the main discharge track, the storage control means comprise buffer control means for each buffer, under the control of which the buffer pockets of the associated buffer are able to receive an object from the buffer feed track, temporarily retain it and eject it in the direction of the buffer discharge track, the main feed track comprises one or more branches to which the buffers are connected by means of their respective buffer feed tracks, a branch gate corresponds to each branch in the main feed track and a buffer gate corresponds to each connection of the buffer feed track, with which gates objects can be selectively deflected towards the desired branch of the main feed track or in direction of the associated buffer feed track, respectively, a gate control including means for is appended to each branch gate and each buffer gate, the first process signal connections connect each gate control, on the one hand, to the gate control of the branch gate located immediately upstream in the main feed track or to the process control means if the gate is the first gate as viewed from the system inlet, and on the other hand, to the gate controls or the gate control and the buffer control means of the gates or gate and buffer situated immediately downstream in each of the gate directions, the second process signal connections connect the process control means to the buffer control means of each buffer, each gate controlcausing the gate to be set, on the basis of object logging signals containing an object identification code of a subsequent object approaching the gate downstream and received via the first process signal connections, in a certain gate position for said object, and sending the object logging signals relating to said object further via the first process signal connections in a direction corresponding to said gate position. 3. Buffer system according to claim 2, characterized in that the process control means comprise discharge process means for continuously selecting of object identification codes of stored objects which have to be discharged and for causing the selected object identification codes to be incorporated in the process control signals.
5. Buffer system according to claim 3, characterized in thatthe object signals comprise sorting characteristics, and the discharge process means perform said selecting, and determine a sequence of discharge on the basis of the sorting characteristics of the instantaneously stored objects. 6. Buffer system according to claim 2, characterized in thatthe buffer control means of each buffer comprise first processor means for retaining a buffer status relating to which object is stored in which buffer pocket and for delivering upstream, via the first process signal connections, a capacity signal which indicates the instantaneous storage capacity of the buffer after every change in the buffer status, every gate control comprises second processor means forretaining the instantaneous storage capacity downstream in each of the two gate directions on the basis of capacity signals received from both gate directions, determining the said gate position as a function of the instantaneous storage capacity downstream in each of the gate directions, and delivery upstream a capacity signal which indicates the sum of the storage capacities in each of the gate directions, via the first process signal connections. 7. Buffer system according to claim 6, characterized in that each buffer gate control is integrated in the buffer control means of the corresponding buffer.
8. Buffer system according to claim 2, characterized in thatevery pocket in the buffer system is identifiable for the process control means by means of a pocket identification code, pocket assignment means are included in the process control means for assigning a free pocket to each object to be stored by adding the pocket identification code of a free pocket to the object identification code in the object logging signal, each gate control determines said gate position on the basis of the pocket identification code encountered in the object logging signal, and each buffer control causes an object to be stored in the free pocket determined with the pocket identification code encountered in the object logging signal. 9. Buffer system according to claim 8, characterized in that the pocket identification code comprises a buffer number code uniquely identifying a buffer and a pocket number code uniquely identifying a pocket inside a buffer.
22. Video coding system for providing objects with an object code for the purpose of automatically processing said objects, comprising:storage means including a number of parallelly ordered storage locations for receiving, temporarily retaining and discharging each object individually; a main feed track along which the objects are fed from a system inlet in the direction of the storage means, a main discharge track along which the objects are discharged from the storage means in the direction of a system outlet, storage control means for controlling the storage means, process control means for continuously determining which objects are fed, stored and discharged, video image pick-up means positioned at the system inlet for picking up video image signals from passing objects, one or more video coding stations for displaying said object video images and for keying in object codes, video image control means for receiving the video image signals, for deriving object signals from the received video image signals and sending them to the process control means, for causing the object video images to be displayed, and for receiving the object codes keyed in, code printing means positioned near the system outlet for applying the object code to objects passing the code printing means and connected to the process control means by a write signal connection, a bidirectional connection between the video control means and the process control means, first and second process signal connections which connect the process control means to the storage control means;said process control means including means for receiving the object signals via the bidirectional connection, assigning an internal object identification code to each object on receiving the associated object signals, compiling object logging signals and transmitting them via the first process signal connections, which object logging signals contain the object identification code of an object which has to be stored,receiving storage indication signals via the first signal connections, which storage indication signals contain the object identification code for each stored object, and compiling process control signals and transmitting them over the second process signal connections, which process control signals contain the object identification code of each object which has to be discharged, and despatching the process control signals with said object identification codes in order to cause the objects corresponding to said object identification codes to be discharged, and presenting the object codes via the write signal connection to the code printing means in a sequence corresponding to that in which the objects are discharged, said video image control means including means forreceiving the object identification codes assigned by the process control means via the bidirectional connection, and sending back to the process control means the object identification codes, each together with the corresponding object code keyed in, via the bidirectional connection, and the storage control means including means forcausing objects to be stored in the storage means in an individually identifiable manner on receipt of object logging signals received via the first process signal connections, compiling the storage indication signals and transmitting them via the first signal connections to the process control means, and causing the objects stored therein in an individually identifiable manner to be discharged on the basis of the process control signals received via the second process signal connections. 23. Video coding system for providing objects with an object code for the purpose of automatically processing said objects, comprising:a main feed track along which the objects are fed from a system inlet, a main discharge track along which the objects are discharged in the direction of a system outlet, storage means including a number of parallelly ordered storage locations for receiving, temporarily retaining and discharging each object individually, which storage means comprise a number of buffers which are each provided with a feed track connected to the main feed track, a number of individually controllable buffer pockets, and a discharge track connected to the main discharge track, storage control means for controlling the storage means, which storage control means comprise buffer control means for each buffer, under the control of which the buffer pockets of the associated buffer are able to receive an object from the feed track, temporarily retain it and eject it in the direction of the discharge track, the main feed track comprises one or more branches to which the buffers are connected by means of their respective feed tracks, a branch gate corresponds to each branch in the main feed track and a buffer gate corresponds to each connection of the feed track of a buffer, with which gates objects can be selectively deflected towards the desired branch of the main feed branch or in the direction of the associated feed branch, respectively, a gate control is appended to each branch gate and each buffer gate, process control means for continuously determining which objects are fed, stored and discharged, video image pick-up means positioned at the system inlet for picking up vide image signals from passing objects, one or more video coding stations for displaying said object video images and for keying in object codes, code printing means positioned near the system exit for applying the object codes to the objects passing the code printing means, first process signal connections which connect each gate control, on the one hand, to the gate control of the branch gate located immediately upstream in the main feed track or to the process control means if the gate is the first gate as viewed from the system inlet, and on the other hand, to the gate controls or the gate control and the buffer control means of the gates or gate and buffer situated immediately downstream in each of the gate directions, second process signal connections, which connect the process control means to the buffer control means of each buffer,said process control means including means for receiving the video image signals, assigning an internal object identification code to each object on receiving the associated video image signals, compiling object logging signals and transmitting them via the first process signal connections, which object logging signals contain the object identification code of an object which has to be stored, causing the video image signals of an object to be presented at an available video coding station and receiving the object code keyed in, continuously selecting of object identification codes of stored objects which have to be discharged, receiving storage indication signals via the first signal connections, which storage indication signals contain he object identification code for each stored object, and compiling process control signals and transmitting them over the second process signal connections, which process control signals contain the selected object identification code of each object which has to be discharged, and a time indication for the determination, by the respective buffer control means, of the time instant at which an object to be discharged has to appear at the system outlet, and causing said object code to be applied with the code printing means at a time instant derived from the time instant at which the object must be at the system outlet, each gate control including means forcausing the gate to be set, on the basis of object logging signals containing an object identification code of a subsequent object approaching the gate downstream and received via the first process signal connections, in a certain gate position for said object, and sending the object logging signals relating to said object further via the first process signal connections in a direction corresponding to said gate position, and the buffer control means of each buffer including means forcausing objects to be stored in free buffer pockets in an individually identifiable manner on receipt of object logging signals received via the first process signal connections, compiling the storage indication signals and transmitting them via the first signal connections to the process control means, and causing, on the basis of the received process control signals, the objects stored therein in an individually identifiable manner to be discharged on moments derived from the time indications in order to let arrive them at time instants at the system outlet as determined by the process control means. Description
SUMMARY OF THE INVENTION The object of the invention is to provide a highly flexible buffer system and a buffer for flat objects such as letters in which objects fed along a feed track and unordered sequentially can be stored in an individually identifiable manner and then be ejected again via a discharge track selectively and independently of the feed on the basis of selection criteria determined during storage, which buffer system and buffer do not, in addition, have the disadvantages mentioned of the known techniques. A buffer system for carrying out a buffer process comprising feeding flat objects, such as letters, provided with scannable symbols, in an unordered sequence, temporarily storing them and discharging them in an ordered sequence, which buffer system comprises
REFERENCES (1) German Auslegeschrift No. 1,277,606 Title: Verteilforderanlage fur mit abtastbaren Sortiermarkmalen versehene flache Sendungen, wie insbesondere Postsendungen (Distribution and conveyance system for flat consignments, such as in particular postal consignments, provided with scannable sorting features).
DESCRIPTION OF EXEMPLARY EMBODIMENTS Although the invention is in principle suitable for use in systems in which the temporary, separate storage of individually identifiable, essentially flat objects associated with certain rigidity limits is necessary, it will be explained with reference to systems which are suitable for letter post processing. More particularly, two buffer systems according to the invention will be described, one suitable for sorting letters and one suitable for video coding letters. But first of all, what is common in both systems will be described.
FIG. 3 shows diagrammatically a buffer having only 8 pockets. In principle, however, this number can be chosen to be as large as desired, depending on the application. In an operational system, a buffer will comprise, for example, 16, but preferably 32 or even 64 pockets. The construction of a pocket 28, which will be described below in detail with reference to FIG. 4, is therefore such that the invention provides a very compact continuous row of parallel pockets, each pocket of which adjoins the buffer feed track 21 at a suitably chosen angle, in this case 30
FIG. 4 shows a buffer pocket, namely in section (a) in a plan view, in section (b) in a side elevation and in section (c) in greater detail, the input of each pocket in plan view. Each pocket comprises two identical walls 51 which are offset slightly with respect to each other and have a somewhat concave/convex profile when viewed in longitudinal section and of which the flat ends 52 and 53 which respectively adjoin the buffer feed track 21 and the buffer discharge track 22 again lie approximately in the same plane. The pockets adjoin one another in such a manner that every wall 51 is the dividing wall of two consecutive pockets. Over the concave side formed between the flat ends 52 and 53, an endless elastic conveyor cord 54 is stretched more or less rectangularly over four flat conveyor wheels 55, fitted in pairs on the flat ends 52 and 53. One of the conveyor wheels 55' can be driven as a result of a rigid coaxial coupling to a drive wheel 56 over which a drive cord 57 runs to a motor 58 (N.B. this corresponds to motor 31 in FIG. 3). The drive is carried out in a manner such that a forward section 54a (upper side of the rectangle) of the conveyor cord 54 is driven in a direction which corresponds to the conveyance directions in the buffer feed and discharge tracks 21 and 22. The return section 54b (lower side of the rectangle) of the conveyor cord 54 and the drive (motor 58, drive cord 57, the drive wheel 56 and the conveyor wheel 55') are located below a strip 59 which serves as base plate inside the pocket and which is vertically mounted on each wall 51 in parallel with the forward section 54a of the conveyor cord. Fitted at the back of said concave side, that is to say at the convex side, of each wall 51 is a sliding block 60 which is provided with a channel 61 which is able to accommodate the forward section 54a of a conveyor cord 54 on an adjacent wall 51. At the side where the pocket adjoins the buffer feed track 21, the wall 51 is extended by means of a flat section 62 comprising an intermediate section 63 rigidly joined at one side to the wall and an end section 64 rotatably joined, preferably by means of an elastic hinge 65, to the other side of the intermediate section 63. Said end section 64 comprises two parts, one wider part 64a above the base plate strip 59 and a narrower extension 64b. Said narrower extension 64b is joined via a yoke 68 coupled at two sides by means of elastic hinges 66 and 67 to the driving end 69 of a plunger-type solenoid 70. As a result of this connection, the wider part 64a is able to act as a gate vane. For this reason, said part 64a is also designated hereinafter as gate vane part or gate vane for short (and corresponds to the pocket gate 29 in FIG. 3, while the plunger-type solenoid 70 with its driving end 69 corresponds to the pocket gate drive 30). With the plunger-type solenoid 70 in an inactivated state, said broader part has a position in which said part is approximately parallel to the buffer feed track 21 and closes off the entrance of the pocket in this position. In the activated state of the plunger-type solenoid 70, said part 64a is approximately parallel to the plane in which the conveyor cord 54 is stretched and the pocket is opened. The plunger-type solenoid is fitted on an angular support 71 which is mounted in its turn under the base plate strip 59 at the flat end 52 of the wall 51. Conveyance in the buffer feed track 21 is brought about by a number, in this case 3, of endless conveyor cords 72 which are able to interact to produce conveyance with flexible elastic flaps 73 fitted on the end of the gate vane part 64a between recesses 74. In the closed state of the gate vane part 64a, said flaps project at an angle of approximately 30 They are therefore able to deliver that normal force which is necessary to bring about a sliding/entraining conveyance of letters which are located in the buffer feed track 21 between the endless conveyor cords 72 and the flaps 73. In the opened state, as a result of the presence of the recesses 74 the gate vane part 64a is able to intervene as a counter current gate in said sliding/entraining conveyance and feed a letter from the buffer feed track 21 into the pocket.
Messages despatched via said asynchronous communication channels have a record structure, opened and closed by unique start and stop codes, and within the record, have one or more fields, for example a message code which indicates the type of message and further parameters which are associated with said code. In the description below of the message exchange during the initiation process and the buffer process (see E.5.7 and E.5.8 respectively), use will be made of the signs &lt; and &gt; to differentiate the start and stop codes and the various fields inside a record.
INIT1 =&amp;lt;SOR&amp;gt;&amp;lt;INIT1-TAG&amp;gt;&amp;lt;W/M&amp;gt;&amp;lt;WISSELNR&amp;gt;&amp;lt;BUFFERNR&amp;gt;&amp;lt;EOR&amp;gt;
FOUT (fault=&amp;lt;SOR&amp;gt;&amp;lt;FOUT-TAG&amp;gt;&amp;lt;FOUTCODE&amp;gt;&amp;lt;WISSELNR&amp;gt;-&amp;lt;BUFFERNR&amp;gt;&amp;lt;EOR&amp;gt;
INIT2=&amp;lt;SOR&amp;gt;&amp;lt;INIT2-TAG&amp;gt;&amp;lt;WISSELNR&amp;gt;&amp;lt;BUFFERNR&amp;gt;-&amp;lt;#-VAKKEN&amp;gt;&amp;lt;EOR&amp;gt;
INIT3=&amp;lt;SOR&amp;gt;&amp;lt;INIT3-TAG&amp;gt;&amp;lt;MAX-WISSEL&amp;gt;&amp;lt;MAX-BUFFER&amp;gt;&amp;lt;LM1&amp;gt;-&amp;lt;LM2&amp;gt;&amp;lt;LT1&amp;gt;&amp;lt;LT2&amp;gt;&amp;lt;LF2&amp;gt;&amp;lt;LF2&amp;gt;&amp;lt;EOR&amp;gt;
BBS=&amp;lt;SOR&amp;gt;&amp;lt;BBS-TAG&amp;gt;&amp;lt;BIC&amp;gt;&amp;lt;BL&amp;gt;&amp;lt;EOR&amp;gt;
INVAK=&amp;lt;SOR&amp;gt;&amp;lt;INVAK-TAG&amp;gt;&amp;lt;BIC&amp;gt;&amp;lt;EOR&amp;gt;
OVERLOOP (overflow)=&amp;lt;SOR&amp;gt;&amp;lt;OVERLOOP-TAG&amp;gt;&amp;lt;BIC&amp;gt;&amp;lt;EOR&amp;gt;
PRODUKT (product)=&amp;lt;SOR&amp;gt;&amp;lt;BN&amp;gt;&amp;lt;BIC-[1]&amp;gt;&amp;lt;BIC-[2]&amp;gt;-----&amp;lt;BIC-[BN]&amp;gt;&amp;lt;EOR&amp;gt;
TIJDPRODUCT (time product)=&amp;lt;SOR&amp;gt;&amp;lt;BN&amp;gt;&amp;lt;BIC-[1]&amp;gt;&amp;lt;TI-[1]&amp;gt;----&amp;lt;BIC-[BN]&amp;gt;&amp;lt;TI-[BN]&amp;gt;&amp;lt;EOR&amp;gt;
&amp;lt;TIME-TAG&amp;gt;
VAKLEEG (pocket empty)=&amp;lt;SOR&amp;gt;&amp;lt;VAKLEEG-TAG&amp;gt;&amp;lt;#-LEEG&amp;gt;-&amp;lt;EOR&amp;gt;
SHORT DESCRIPTION OF THE DRAWING The invention will be explained in greater detail with reference to a drawing, in which:
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