JPS59108620A - Material feeder - Google Patents

Abstract

PURPOSE:To automatically transport materials in a stack magazine sheet by sheet by providing material transport means with a detector for detecting the rising position of the uppermost material and controlling the rising amount of a lifter according to a detection value to reduce the number of detectors. CONSTITUTION:Detectors 12, 13 for detecting the rising position of the uppermost material 15 after a vacuum cup 10 is lowered to a fixed position are disposed in the vicinity of material transport means. When the uppermost material 15 is positioned above the upper limit of the rising position, an upper limit detector 12 is switched on, and data smaller than thickness data of the material 15 is output as thickness data to a driving motor of a lifter 17, thereby controlling the rising amount of the lifter 17. When the uppermost material is positioned below the lower limit of rising position, a lower limit detector 13 is switched on, and data larger than thickness data of the material is output as thickness data to the lifter 17, thereby controlling the rising amount of the lifter to locate the uppermost material 15 at the optimum position. Subsequently, the material 15 is adsorbed by the vacuum cup 10 to be raised and conveyed to a press machine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for stacking a plurality of materials contained in a stack magazine into one
This invention relates to a material supply device that can sequentially supply sheets one by one to a press device.

In general, this glue material supply device lowers a vacuum cup 1 of a material conveyance device to a predetermined position as shown in Fig. 1, and collects a plurality of materials (blank materials) 3 stacked and stored in a frame 2 of a stack magazine. The uppermost blank material 3a is picked up and raised, and the receiver passes this blank material 3a to a press device (not shown). On the other hand, the lifter 4 raises the blank material 3 in the frame body 2 by the plate thickness t of the blank material 3 every time the blank material is conveyed, so that the topmost blank material 3a is always at a constant height. Make it. By operating the lifter 4 in this manner, it is possible to interlock with the press operation earlier than p1.

Furthermore, if the stack magazine 5 is provided with a plurality of stations as shown in FIG. 1 as shown in FIG.
Even when all the blanks 3 at one station have been conveyed, it is possible to move to the next station, and the blanks 3 can be continuously supplied without stopping the press operation.

However, when the lifter 4 raises the blank material 3 by a certain plate thickness r9 of the blank material 3, the position of the uppermost blank material 3a may become lower than the desired feed level due to variations in plate thickness, etc. As a result, the vacuum cup 1 may not be able to suction (clamp) the blank material 3a, causing misfeed, or the vacuum cup 1 and the blank material 3a may interfere and break. .

In order to solve the above problems, the conventional material feeding device
A limit switch for setting the feed level was provided on the frame of each station to control the feed level so that the top blank material 3a was always at a constant level.

However, in such conventional material feeding devices, the feed level must be set by the position of the limit switch mounted on the frame, and therefore l) in a stack magazine having multiple stations, the limit switch set for each station must be set; 2) If the blank material is small and the stations are close to each other, it is difficult to install a limit switch. 3) If the feed level changes due to changes in mold height, etc. There were problems such as the need to set the limit switch again.

An object of the present invention is to provide a material supply device that can solve the above problems.

According to the present invention, a detector is provided near the vacuum cup of the material conveying means to detect the rising position of the highest material among the plurality of materials stored in the stack magazine after the vacuum cup has descended to a predetermined position. The amount of lift by the lifter is controlled based on the output of this detector.

The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 3 shows the main part of the mechanism of the material supply device according to the present invention, in which a beam 11 projects from the bottom of the vacuum cup 10, and an upper limit switch 12 and a lower limit switch 13 are provided on this beam 11. There is.

The upper limit switch 12 and the lower limit switch 13 are provided to define the upper and lower limits of the ascending position of the uppermost blank 15a of the blanks 15 housed in the frame 14 of the stack magazine.
6 is lowered and the vacuum cup 10 stops at a predetermined feed level, the raised position of the uppermost blank material 15a is detected. That is, by turning on the upper limit switch 12, it is possible to detect an excess of the amount of rise of the blank material 15, and by turning off the lower limit switch 13, it is possible to detect an insufficient amount of rise of the blank material 5. . Note that the upper limit switch 12 and the lower limit switch 13 are arranged such that their operating points are shifted by a predetermined tolerance (for example, 1 mm).

@4 Figure is a block diagram showing an embodiment of a rising amount control circuit of a material supply device according to the present invention. In FIG. 4, first, the start switch 2o is turned off, the subtraction circuit 21 is inactivated, that is, the signal 11'' is not applied from the subtraction circuit 21 to the OR circuit 22, and then the preparation button O is pressed. At this time, the vacuum cup 10 (third cause) is stopped at a predetermined feed level, the blank material 15 is being lifted by the lifter 17, and the upper limit switch 12 and lower limit switch 13 are both off.

Since the lower limit switch 13 is off, it outputs a signal 10'', and the inverter 24 inverts this signal 10'' and outputs it to the AND circuit 25, enabling the AND circuit 25 to operate.Here, When the preparation button 23 is pressed, a signal "1" is sent from the preparation button field to the AND circuit 2.
5. Motor 27 via OR circuit 22 and amplifier 26
is applied to the lifter 17'' by the driving force of the motor 27.
is raised.

The blank material 15 rises with the rise of the 7-pointer 17, and the uppermost blank material 15m is lower limit switch 13.
When reaching the detection position, the output signal of the lower limit switch 13 becomes @1'', and the inverter 24 outputs this signal @l
” is inverted and added to the AND circuit 5, making the AND circuit 5 inoperable. Therefore, the output signal of the OR circuit 22 becomes @0
'', the rotation of the motor 27, that is, the lifting of the lifter 17 is stopped, and the inverter 4, which inverts the output signal @0 of the OR circuit 22, outputs an inverted signal ``1#'' as the positioning completion signal ED.

When the conveyance device receives the positioning completion signal ED,
The best blank material 15a is removed by the vacuum cup 10.
Then, the arm 16 is raised, conveyed to a press device (not shown), and transferred to the press device.

On the other hand, when the AND circuit 5 becomes inoperable and outputs the signal ``o'', the inverter 29 inputting this signal ``o'' sends the signal ``1#'' to the load terminal LD of the latch circuit 31 via the OR circuit. Add to. The latch circuit 31 activates the upper limit switch 12 and the lower limit switch 13 by the rising edge of the signal "'l#" applied to the load terminal LD.
The output signals of are latched, and each launched signal is applied to an AND circuit 32 and a NAND circuit 33, respectively. The AND circuit 32 outputs a signal @1' to the subtraction instruction input 8U of the addition/subtraction circuit 34 when both the two input signals are @1'' (when both the limit switches 12 and 13 are on), and the NAND circuit 33 When both the human input signals are 01 (when the limit switches 12 and 13 are both off), a signal @1'' is output to the addition instruction input AD of the addition/subtraction circuit 34.

In this case, since the lifter 17 is stopped after the lower limit switch 13 is turned on, the lower limit switch 13 is turned on and the upper limit switch 12 is turned off. All of the circuits 33 output a signal "'o#".

The addition/subtraction circuit 34 instructs the amount of lifter 17 to rise, and calculates thickness data t corresponding to the thickness of one sheet of blank material 15.
and correction data 沁, which is smaller than the plate thickness data t, are added. Outputs the increase amount command value shown in .

In Table 1, when both the upper limit switch 12 and the lower limit switch 13 are turned on and No. 91 11'' is added to the subtraction instruction manual SU from the AND circuit 32, the data obtained by subtracting the correction data product from the plate thickness data t ( t-4) as the rising amount command value, and the rising limit switch 12
and the lower limit switch 13 are both turned off, and when the signal "'1#" is applied to the addition instruction manual AD from the NAND circuit 33, the data (1+ciJ) which is the sum of the plate thickness data t and the correction data product is set as the increase amount command value. If the signal @1'' is not applied to either the addition instruction input AD or the subtraction instruction input SU, the plate thickness data t is output as the increase amount instruction value.

The increase amount command value outputted from the addition/subtraction circuit A is preset in the subtraction circuit 21 at substantially the same timing as the latch timing of the latch circuit 31. In this case, plate thickness data t is preset as the increase amount command value.

The start switch 20 is turned on at an appropriate time after the above-mentioned first positioning completion signal ED is input to the conveyance device and the vacuum cup 10 has suctioned and raised 15 m of blank material.When the switch is turned on, the start switch 20 is turned on. The signal ``1'' from 2o is applied to the enable terminal EN of the subtraction circuit 21, enabling the subtraction circuit 21 to operate.

The subtraction circuit 21 is constituted by, for example, a down counter, and when enabled, applies a signal @1'' to the motor 27 via the OR circuit 22 and the amplifier 26 to drive the motor 27 unless the count value becomes O. The lifter 17 is raised by the driving force of the motor 27, and a pulse train is added from the pulse oscillator 35 to the subtraction manual power DN of the subtraction circuit 21 in accordance with the amount of rotation of the motor 27 (the amount of rise of the slide 17). .The subtraction circuit 21 counts down the pulses that are sequentially added from the ascending command value when preset as @, and when the count value reaches 0, it outputs a signal ""0".
Output.

When the output signal of the subtraction circuit 21 becomes @0#, the motor 27
The rotation of , that is, the raising of the 7-pointer 17 is stopped, and the inverter 28 outputs the inverted gear signal "'1" as the positioning completion signal ED.

By the above-mentioned operation, the blank material 15 is raised by an amount outside its thickness, and the uppermost blank material 15a is in a waiting state at the feed level.

After the conveyance device passes the blank material 15 to the press device, the arm 16 descends and stops at a predetermined feed level, and the conveyance device outputs the conveyance device home position signal IN (''1#) and It adsorbs the blank material 15a and starts to rise.The signal IN is applied to the load terminal LD of the launch circuit 31 via the OR circuit 30, and the latch circuit 31 is activated by the rising edge of the signal IN as described above. 12 and lower limit switch■3
Latch the output signal.

Based on the outputs of the limit switches 12 and 13, the adding/subtracting circuit 34 outputs a command value corresponding to the next increase M to be raised. When the position of the material i5a deviates from the predetermined feed level by a predetermined amount, the plate thickness data t is corrected by the correction data product (addition or subtraction of the correction data η), and this corresponds to the next rise M to be raised. output as a command value.

Thereby, the amount of rise of the blank material 15 can be controlled so that the uppermost blank material 15a can stand by at a substantially constant height.

In this embodiment, the upper limit switch 12 and the upper limit switch 13 are used as position detectors for the uppermost blank material, but the present invention is not limited to this. For example, as shown in FIG. 5, one displacement sensor 36 may be used. You can also do this. By using this displacement sensor (6), the mounting part becomes simple, and the upper and lower limits of the ascending position of the uppermost blank material 15a can be easily changed by the circuit part (Fig. 6) of this displacement sensor 36. can.

That is, the displacement sensor 36 sends voltage signals corresponding to the position of the displacement detection body 36a to the comparators 37 and 38, respectively.
is added to the A input of A voltage signal corresponding to the desired upper limit position is applied to the B input of the comparator 37 from the upper limit setting volume 39, and a voltage signal corresponding to the desired lower limit position is applied to the B input of the comparator 38 from the lower limit setting polyneum 40. A signal is added.

Since the comparators 37 and 38 each output a signal @1# when the large input becomes larger than the B input, the comparator 37 outputs a signal when the northernmost blank 15a is above the preset upper limit position. The comparator 38 outputs a signal "1" when the uppermost blank material 15a is at or above the preset lower limit position.In other words, the output signals of the comparators 37 and 38 are set to the upper limit position described above. It can be used as a signal equivalent to the output signals of the limit switch 12 and lower limit switch 13.

As explained above, according to the present invention, since the position detector is provided on the conveying device side, there is no need for a limit switch for each station that accommodates blank materials, which is a problem with the conventional method, and the number of limit switches can be reduced. Decrease sharply.

Further, since the feed level is set on the conveying device side (the lowered position of the vacuum cup), the feed level can be extremely easily changed in accordance with changes in the height of the mold, etc.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the main parts and general composition of the material supply device, FIG. 2 is a perspective view showing an example of a stack magazine, and FIG. FIG. 4 is a block diagram showing one embodiment of the upper and external view control circuit of the material supply device according to the present invention, FIG. 5 is a mechanical diagram of main parts showing another embodiment of the material supply device according to the present invention, and FIG. 6 is the circuit part of the displacement sensor 0 10... Vacuum cup, 11... Beam, 12...
- Upper limit switch, 13... Lower limit switch, 14... Frame, 15... Blank material, 16.
...Arm, 17...Lifter, 20...Start switch, 21...Subtraction circuit, 23...Preparation button,
27...Motor, 34...Addition/subtraction circuit, 36...
displacement sensor. Figure 1'Figure 2

Claims (1)

[Claims] a material conveying means for lowering a vacuum cup to a predetermined position, adsorbing the best material among a plurality of materials stored in a stack magazine, and conveying the material to a press device; and a material conveying means for conveying the material. and a lifter that lifts the material in the stack magazine by the thickness of each material based on the thickness data of the material, the material supplying device is disposed near a vacuum cup of the material conveying means, and the vacuum cup is placed in the vicinity of a vacuum cup of the material conveyance means, After descending to the position,
a detector for detecting the raised position of the uppermost material in the stack magazine; and based on the output of the detector, when the uppermost material is above the upper limit of the raised position, the lifter uses data smaller than the plate thickness data as plate thickness data. and a lifting amount control means for outputting data larger than the sheet thickness data to the lid as sheet thickness data when the uppermost material is below the lower limit of the lifting position.