Transport system and transport method

• US 8,019,468 B2
• Filed: 04/25/2007
• Issued: 09/13/2011
• Est. Priority Date: 05/12/2006
• Status: Active Grant

• Current Assignee: Murata Machinery Limited (Muratec), Nippon Telegraph and Telephone Corporation, Nippon Telegraph and Telephone West Corporation (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Murata Machinery Limited (Muratec), Nippon Telegraph and Telephone Corporation, Nippon Telegraph and Telephone West Corporation (Nippon Telegraph and Telephone Corporation)
• Inventors: Hayashi, Takao, Kawano, Hiromichi, Sone, Hiroki, Yamada, Yoshinori, Kobayashi, Toyokazu, Inoue, Akiya, Tsujino, Masayuki
• Primary Examiner(s): Bahta; Kidest
• Application Number:
  US12/300,203
• Publication Number:
  US 20090208313A1
• Time in Patent Office: 1,602 Days
• Field of Search: 700/113, 700/112, 700/226, 700228-230, 700/121, 701/23, 701/20, 701/19, 701/25, 701/200, 401/88.01, 401/88.02, 404/222.01, 705/28.27, 705/226
• US Class Current: 700/228
• CPC Class Codes: G06Q 10/08 Logistics, e.g. warehousing, loading or distribution; Inventory or stock management

Abstract

A transport scenario composed of a basic transport (From) from a transport starting point to, e.g., a buffer near the transport destination point and a basic transport (To) from the buffer to the transport destination point is created in response to a transport request of a production controller for transport whose loading times at the transport starting point and at the transport destination point are specified. The buffer is reserved so as to perform the basic transport (From) and the basic transport (To), transport vehicles are allocated, the travel time to the transport starting point or the buffer and the travel time from the transport starting point or the buffer are estimated, and transport instructions are given to the transport vehicles. The possibility that the loading times are out of the specified period is evaluated. If the possibility is larger, the impossibility of a just-in-time transport is notified to the production controller.

Claims

1. A transport system for transporting articles between a plurality of processing devices by a plurality of auto-guided transport vehicles, the system comprising:

buffers in a plurality of positions along a traveling route of the auto-guided transport vehicles for temporarily storing the articles,

transport instruction issuing means for issuing two kind of transport instructions;

(i) “

From”

instructions corresponding to transportation instructions from transport source processing devices to stopover buffers, and (ii) “

To”

instructions corresponding to transportation instructions from the stopover buffers to transport destination processing devices, the “

To”

instructions having designated arrival times at the transport destination processing devices and being input from outside the transport system,

allocation means for allocating the transport instructions to the auto-guided transport vehicles,

estimating means for estimating times and positions at which the auto-guided transport vehicles will become empty (i) at the stopover buffers after performing the “

From”

instructions, and (ii) at the transport destination processing devices after performing the “

To”

instructions,

predicting means for predicting the times and the positions at which the transport instructions will be issued in the future, based on at least the “

To”

instructions, and

auto-guided vehicle allocating means for running empty auto-guided transport vehicles, based on the times and positions estimated by the estimating means at which the auto-guided transport vehicles will become empty, and for allocating the empty auto-guided transport vehicles to be transported based on instructions that will be issued in the future, in accordance with the times and the positions predicted by the predicting means at which the transport instructions will be issued in the future.

2. A transport system according to claim 1,

wherein the traveling route includes a plurality of intra-bay routes along bays with the processing devices and an inter-bay route connecting the intra-bay routes, and

wherein the auto-guided vehicle allocating means allocates the empty auto-guided vehicles from another part of the traveling route to an intra-bay route based on a difference between a number of issues of the transport instructions with pickup positions in the intra-bay route and a number of the auto-guided transport vehicles that become empty on the intra-bay route estimated by the estimating means.

3. A transport system according to claim 1,

wherein said allocation means estimates traveling times from current positions to pickup positions of the auto-guided transport vehicles allocated by the auto-guided vehicle allocating means and allocates the transport instructions to the auto-guided transport vehicles so that the auto-guided transport vehicles arrive at the pickup positions at predetermined times based on the traveling times estimated by the allocation means.

4. A transport system according to claim 2,

wherein the predicting means predicts the number of the auto-guided transport vehicles that become empty in each intra-bay route from the number of allocated transport instructions whose transport destinations are on the intra-bay route.

5. A transport method for allocating transport instructions to a plurality of auto-guided transport vehicles by a controller and transporting articles between a plurality of processing devices by the auto-guided transport vehicles comprising:

providing buffers in a plurality of positions along a traveling route of the auto-guided transport vehicles for temporarily storing the articles,

issuing two kind of transport instructions;

(i) “

From”

instructions corresponding to transportation instructions from transport source processing devices to stopover buffers, and iii) “

To”

instructions corresponding to transportation instructions from the stopover buffers to transport destination processing devices, the “

To”

instructions having designated arrival times at the transport destination processing devices and being input from outside the transport system,

allocating the transport instructions to the auto-guided transport vehicles,

estimating times and positions at which the auto-guided transport vehicles will become empty (i) at the stopover buffers after performing the “

From”

instructions, and (ii) at the transport destination processing devices after performing the “

To”

instructions,

for predicting the times and the positions at which the auto-guided transport instructions will be issued in the future, based on at least the “

To”

instructions, from the positions of the stopover buffers and pickup times in the transport instructions “

To”

, and

running empty auto-guided transport vehicles, based on the times and positions estimated by the estimating means at which the auto-guided transport vehicles will become empty, and

allocating the empty auto-guided transport vehicles to be transported based on instructions that will be issued in the future, in accordance with the times and the positions predicted by the predicting means at which the transport instructions will be issued in the future.