JPS60112521A - Speed control type shifting device - Google Patents

Abstract

PURPOSE:To improve the shifting efficiency by adjusting the time allocation of the high/low speeds of a succeeding acceleration conveyor according to the arrival timing of transport objects on a carry-in conveyor to a predetermined position and shifting the transport objects to a predetermined position on a carrier. CONSTITUTION:A pulse P is generated by a pulse generator 9 every time the predetermined number of carriers pass a fixed position, and the number N of clock pulses are counted repeatedly by a shift pitch designation means 20 every time this pulse P is inputted. The number of pulses in response to the required low-speed operation time and calculated by a governing operation time judgment means 21 based on the counted data N from this designation means 20, the counted data (n) of clock pulses counted by this designation means 20 before a transport object detector generates a detection signal (r), and the ratio C of the high/low speed difference value against the high speed value of an acceleration conveyor. The acceleration conveyor currently transporting transport objects is switched by a speed adjustment means 22 from a high-speed operation to a low-speed operation during the time in response to the calculated pulses, thus the transport objects are shifted from the carry-in conveyor to the carriers without being stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for conveying trays (7) of a tray conveyor that moves at a constant speed with a constant pinch, by controlling only the speed of conveyed objects that arrive at a fixed position at an arbitrary time without stopping. The present invention relates to a speed-controlled transfer device for transferring general equipment to a predetermined position.

For example, when a stack of newspapers is transported using a tray conveyor for automatic sorting by destination, conventionally, the stacks of newspapers are transported to a position close to the tray conveyor using an input conveyor installed on the side of the tray conveyor, and then placed in a fixed position. The stack of newspapers was then moved to a predetermined position on the tray by stopping the newspaper at a certain point, and then restarting the stack of newspapers at a fixed timing using a tray position detection signal. 1 just before such transfer
A clutch brake is usually used to stop and start general consignments, but it is difficult for clutch brakes to operate at a high frequency of more than 60 times per minute, and general consignments that arrive earlier than the designated timing are temporarily stopped. In addition, since the general consignment that arrives late is transferred to the next tray, the transfer efficiency is low, and the stop time accumulates, leading to the risk that the preceding (1ul) consignment may collide with the subsequent consignment. Conventional transfer devices of this type have various drawbacks.

The purpose of the present invention is to provide a carrier that moves at a constant speed with a constant pinch! To provide a speed-governing type transfer device which eliminates the above-mentioned drawbacks of the conventional method by transferring a general article carried in by a manual conveyor to a fixed position on a carrier only by speed control without stopping it. .

Therefore, in the present invention, the acceleration conveyor of the front wheel portion of the carry-in conveyor is adjusted according to the slowness between the time when the carried object arrives at the detection point on the carry-in conveyor and the time when the carried object passes a predetermined position of the carrier to which the carried object is to be transferred. The method is characterized in that the low-speed operation time and the high-speed operation time are determined by a microcomputer (hereinafter referred to as microcomputer), and the transported object is transferred onto a predetermined Ill device.

Examples of the present invention will be described below. In Fig. 1, 1 is a tray conveyor, on which a tray 2 which can be tilted laterally as an Ill. is attached with a certain pitch.
Move at a constant speed in the direction of the arrow. The 1ul 1 person conveyor 3 installed above the tray conveyor 1 has an infeed conveyor 4, a timing conveyor 5, and an acceleration conveyor 6.7 that are connected to each other. The first general article M, which has been transferred in the same direction as the first article M, is placed at a desired position on the tray 2.

In order to successfully load and transfer the articles M that arrive irregularly to a predetermined position on the tray 2 that moves at a constant speed, an optical detector 8 is provided at a detection position X on the timing conveyor 5 to detect the arrival of the articles M. The pulse generator 9 generates a carrier timing pulse each time, for example, the center of every other tray 2 arrives at a suitable synchronization position Z upstream from the position X.

FIG. 1a shows a case where when the conveyed object M arrives at the detection position X, the tray 2a to which it is to be fed is exactly at the synchronous position Z, and the conveyed object M drives the accelerating conveyors 6 and 7 at a low speed V. As a result, it is placed into the tray 2a at position Y as shown in Figure b. In addition, C in the same figure shows a case where when the IM conveyed article M arrives at position
．． 7 is driven at high speed V, it is thrown into the tray 2b at position Y as shown in figure d. Further, Fig. e shows a case where, when the conveyed object M arrives at position X, the tray 2C is at a position that has advanced by a length l smaller than two trays from the position Z, and in this case, the accelerating conveyor 6. By automatically distributing the high and low speed times 7 according to the length l, the conveyed object M is placed on the tray 20 at the position Y as shown in figure f.

In the above embodiment, a 1ift conveyed article M is transferred to every other tray 2, but this is because the conveyed articles M are input and transferred at two places to one tray conveyor 1, and generally, the IM is transferred from n places. If consignments M are to be transferred, one general consignment M is to be transferred every (n-1) consignments.

The timing conveyor 5 is a belt conveyor, and as shown in FIG.
B are drilled in two rows so as to be different from each other in the front and rear. The optical detector 8 has a pair of sensors lla and Ilb, each of which is connected to a long hole 10a from an optical fiber 12.
.

When the light is received through 10b, the signals a and b shown in FIG.
is generated, and the logical sum signal C disappears when the first transported object M blocks the light, so that it is detected that the transported object M has arrived at the position X. According to this optical detection method, arrival at a fixed position can be accurately detected regardless of the height, shape, etc. of the article M.

FIG. 4 shows the state of movement of the conveyed object M between positions X-7 in FIG. The general conveyance M that has arrived at point The moving state in the case of FIG.
The moving state in the case of FIG. In the case of FIG. 1e, the tray 20 has moved forward by l when the conveyed object M arrives at x, so I! In order for the consignment M to recover the delay time t (between a and d in Fig. 4) corresponding to β,
From point d, it reaches point e at a low speed V, and then returns to point 0 at a high speed V. That is, the longer the arrival time of the conveyed object M at point X, the larger t becomes, and the shorter the low-speed movement time between de and e becomes.
The high-speed travel time between e and c becomes longer, and the average speed becomes larger.

As is clear from the figure, between time t and the low-speed movement time and high-speed movement time, t+C(T-t) + (A-C(T-t) v)/
There is a relationship of V=CT. However, C is a constant determined by the ratio of V and V, and A is the distance between X7. 2 In the above equation, when 1=0, A=CTv, and when t=T, T+A/V=CT ″,', C=1+A/VT=1+Cv/V, ゛, c=v/
(v-v) Therefore, if V=3V, C=1.5.

FIG. 5 is a control block circuit diagram for commanding the acceleration V or V to the acceleration conveyor 6.7. The optical detector 8 generates the detection signal r when the conveyed object M arrives at the position x, and the pulse generator 9 generates the Iff timing pulse p as described above. Signals p, r and a clock pulse S with a period Δt are input to the microcomputer 14, and if the clock pulse S is generated during one cycle T of the signal p, then T=NΔt.
And the delay time t of signal r with respect to signal p is t=
It can be expressed as nΔt (n is the number of clock pulses) (FIG. 4).

In this case, in FIG. 4, the low-speed movement time T1 is T,=C(N-n)△t, and the high-speed movement time T2 is T2=CT-nΔt-C(N-n)△-(C- 1)n
△t. Therefore, by counting the number n of clock pulses that occur during the delay time of the signal r with respect to the signal p, the microcomputer 14 can obtain a speed command signal W that changes in response to T++T2, and the changeover switch W can be changed by the signal W. Then, an AND signal of the speed V or V setting signal set in the low speed setting device 15 and the high speed setting device 16, respectively, and the signal r is applied to the motor controller 17 to control the speed of the motor 18 of the acceleration conveyor 6.7. The speed signal of the motor 18 is sent to the controller 1 by the tachogen 19 directly connected to the motor 18.
7 for closed loop control of the motor 18.

The microcomputer 14 uses the tray conveyor 1 as a means of realizing functions.
The conveyor 6.7 is determined based on the transfer pick number specified by 420 and the delay of 7 hours t from when the tray 2 reaches position 2 until the conveyed object M to be transferred to it arrives at position x. Low speed operation time T.

and a speed adjustment means 22 that determines a low-speed operation time and a high-speed operation time.

FIG. 6 is a flowchart showing the operation of each of the means 20, 2L 22 mentioned above. - First, when the program starts, the transfer pitch specifying means 20 repeats the operation of counting N clock pulses S by inputting the signal p and then resetting (steps ■, ■), and the low-speed operation time determining means 21 , the number of pulses n counted up to the time when the signal r is input is taken in, and pJ-n
Calculate the value of C(N-n) from the value of . This value is the number of clock pulses during the low-speed operation time TI (steps ① to ①). Then, in the speed adjusting means 22, C(N-
Subtract clock pulse S by 1 from the value of n), output a low speed command until the subtracted value becomes 0, and output a high speed command when it becomes 0 (“Ste Knob ■ ~ ■)”. The thread winter ends.

The changeover switch W is normally closed toward the high speed setting device 16, and is closed toward the low speed setting device 15 only when low speed operation is required. Therefore, the speed adjusting means 22 only needs to determine the low-speed operation time T, and there is no need to separately regulate the high-speed operation time T2.

When the conveyance item M is a bundle of newspapers, the newspapers folded into eight will be transferred to the acceleration conveyor 6 faster than those folded into four and transferred to the front band of the tray 2, so the newspaper will be folded into eight. In this case, the timing conveyor 5 is automatically slowed down and controlled so that the tray 2 is transferred to the center. To distinguish between 4-fold and 8-fold, three (3) solid optical detectors placed in the transport direction are used so that in the case of 4-fold, all of the light is blocked at the same time, and in the case of 8-fold, only two are blocked at the same time. Alternatively, this can be done by counting the number of pulses until the newspaper bundle passes.

In the above embodiment, the conveyed articles M are loaded into the tray 2 from above, but they may also be transferred from the side of the tray conveyor. Since it is connected, the acceleration conveyor6.
The speed of the accelerating conveyor 6.7 is determined so that the speed v, V of 7 becomes the minute speed in the direction of the tray conveyor 2.

In addition, the above embodiment is an example in which, after the tray 2 arrives at the Z position, the first transported object M arrives at the detection point In this case, the accelerating conveyor, which normally operates at low speed, may be operated at high speed for a time corresponding to tl, and then return to low speed operation.

In this case, the number of pulses (C-1) corresponding to high speed time T2
n is calculated in the regulating operation time determining means 21, and a high speed command is output from the opening speed adjusting means 22 for the time corresponding to this number of pulses.

The present invention has the above configuration, and when transferring an object from an incoming conveyor to a carrier such as a tray conveyor, the object is moved to a predetermined position on the incoming conveyor without having to temporarily stop the object as in the conventional case. According to the arrival timing of the accelerating conveyor, the time distribution between the two high and low speeds of the following accelerating conveyor is adjusted and the conveyed object is transferred to a predetermined position on the carrier, so frequent speed adjustments of the accelerating conveyor can be performed smoothly. At the same time, the transfer efficiency is good because there is no need to temporarily stop the conveyed object immediately before transfer, as is the case with conventional methods, and the subsequent conveyed object is placed in front of the first one.
It has excellent effects such as not colliding with ull-conveyed items.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 a to f are schematic elevational views showing the transfer action of the present invention with respect to various relative positional deviations between the carrier and the conveyed object, and Fig. 2 shows a detector. Fig. 3 is a signal waveform diagram of the detector, Fig. 4 is an explanatory diagram of the operation of the accelerating conveyor, Fig. 5 is a control block circuit diagram, and Fig. 6 is a flow chart of the microcomputer. show. 1...Constant speed conveyor 2...Carrier 3...1111 person conveyor 5...Timing conveyor 6.7...Acceleration conveyor 8...Detector 9...
・Pulse generator 17...Motor controller 20...Transfer pitch specifying means 21...Governing operation time judgment means 22...Speed adjustment means M...Transferred object p...Carrier timing pulse r ...Detected signal

Claims (1)

[Claims] 1! A transfer device that transfers objects from a general conveyor to a predetermined number of carriers on a constant-speed conveyor in which containers are attached with a certain pinch, and a detection system that detects when the 111-person conveyor has arrived at the detection position of the IB conveyor. a timing conveyor equipped with a timing conveyor and an acceleration conveyor connected to the tip of the timing conveyor and controlled to switch between high and low speeds, and generating a carrier timing pulse every time the predetermined number of carriers pass a fixed position; the number N of clock pulses corresponding to the period of the generator and the carrier timing pulse each time the pulse is input;
transfer pitch designating means for repeatedly counting the number of clock pulses, the N count data input from the transfer pitch designation means and the number n of clock pulses counted by the transfer pitch designation means until the detection signal of the detector is generated. control operation time judgment means for calculating the number of pulses corresponding to the required low speed operation time from the count data and the ratio C of the high and low speed difference value to the high speed value of the acceleration conveyor, and the acceleration conveyor is normally operated at high speed. Outputs the reference speed command signal and determines the speed governing operation time. a speed adjustment means for outputting a low speed command signal to operate the acceleration conveyor at a low speed for a time corresponding to the number of pulses calculated by M; and a speed adjusting means for outputting a low speed command signal to operate the acceleration conveyor at a low speed; A speed-governing type transfer device that includes a motor controller that controls the speed during transport of objects.