JP2896101B2 - Workpiece split supply method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of dividing and supplying a work, which is applied, for example, to sequentially supply articles to be packed to a packaging machine.

[0002]

2. Description of the Related Art Conventionally, in a packaging apparatus, as shown in FIG.
After transferring the work 50 without any gap at 51 and further dividing the work 50 into a single piece or a predetermined number, the work 50 is transported by a transfer conveyor 57 having an attachment 55 that circulates and rotates at a predetermined interval.
And the packaging material via the foamer 53 arranged downstream
It is packaged in 54.

In the packaging apparatus, how to supply a predetermined number of the plurality of works 50 to the transfer conveyor 57 is an important issue. That is, it is necessary to supply the work 50 from the divided supply conveyor 51 to the attachment 55 of the transfer conveyor 57 with good timing. For this reason, conventionally,
Servo motor to be proportional to the transfer speed of attachment 55
The divided supply conveyor 51 is driven intermittently by driving the divided supply conveyor 51 at 58 and detecting the leading end of the first work 50 that has reached the downstream end of the divided supply conveyor 51 by the work detection sensor 60. In some cases, the timing of feeding the work 50 to the transfer conveyor 57 is corrected.

[0004]

However, in the above-described conventional means, since the divided supply conveyor 51 is temporarily stopped, a large number of works 50 in the pressing state on the upstream side of the divided supply conveyor 51 are mutually connected. Pulsations that collide with each other periodically occur. This pulsation phenomenon is caused by the work 50
It becomes more noticeable as the workpiece 50 is transported at a higher speed, and there is a possibility that the workpiece 50 may be shifted to cause an error in the supply timing to the transport conveyor 57, and that the workpiece 2 may fall off from the upstream conveyor. High-speed transfer of 50 was difficult, and it was a factor that could not improve packaging capacity.

Therefore, instead of intermittently operating the divided supply conveyor 51, it is conceivable to increase or decrease the speed by controlling the servo motor 58 by a microcomputer.
Since the servo motor 58 is controlled by the microcomputer, there is a disadvantage that the device becomes complicated and expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and can prevent intermittent feeding of a divided supply conveyor, smoothly divide a work without pulsation, and supply the divided work to a transfer conveyor. Another object of the present invention is to provide an inexpensive work dividing and supplying method with a simple structure.

[0007]

The technical means taken by the present invention to solve the above-mentioned problem is that a plurality of works 2 are divided.
In order to receive from the supply conveyor 3 to the transfer conveyor 7, the servo motor 5, which is driven independently of the transfer conveyor 7,
It is connected to the divided supply conveyor 3 and the transfer conveyor 7
The servo motor 5 is controlled by a signal proportional to the rotation speed.
In the method of dividing and supplying the work controlled by the control device 19, the work 2 reaching the downstream end of the divided supply conveyor 3 is
When the work detecting sensor 17 detects the tip,
The device 19 stops transmitting signals to the servo motor 5, and
The motor 5 is divided and supplied by the discharge of the accumulated pulse.
A Before decelerating 3 and stopping the split supply conveyor 3
Then, from the divided supply conveyor 3 to the transfer conveyor 7,
The origin signal, which is the timing reference for supplying the
Of the detection means provided on the rotating shaft 14 of the transfer conveyor 7
From the origin signal transmission sensor 15 that detects rotation to the control device 19
When transmitted, the control device 19 drives the servo motor 5 again.
Pulse signal to feed the divided feed conveyor 3 at a predetermined speed.
To speed up .

[0008]

According to the method of the present invention, the control unit 19 controls the servomotor 5 according to the transfer speed of the transfer conveyor 7, so that the split supply conveyor 3 transfers the work 2 at a predetermined speed. When the work detecting sensor 17 detects the leading end of the work 2 that has reached the downstream end of the split supply conveyor 3, the control device 19 stops transmitting signals to the servomotor 5.

At this time, the servo motor 5 decelerates the divided supply conveyor 3 by the accumulated pulse, and the stop time is delayed. Further, when the origin signal is transmitted to the control device 19 before the divided supply conveyor 3 stops at the time of deceleration of the servomotor 5, the control device 19 sends a driving pulse signal to the servomotor 5 again to perform divided supply. The speed of the conveyor 3 is increased to a predetermined speed.

Therefore, the work 2 is reliably supplied to the transfer conveyor 7 from the divided supply conveyor 3 whose speed has been increased and the supply timing has been corrected. Moreover, since the divided supply conveyor 3 is not stopped, the work 2 is smoothly received, and the work 2 on the upstream side of the divided supply conveyor 3 or the like is not stopped.
Pulsation can be prevented.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an upstream conveyor connected to a device for manufacturing or processing a work 2 (not shown). Reference numeral 1a denotes a pressing belt device provided on the downstream side and above the upstream conveyor 1, and the interval between the pressing belt device 1a and the upstream conveyor 1 is adjusted to a distance sandwiching the supplied work 2 therebetween. At the same time, they are interlocked and connected by the gear mechanism 4 or the chain mechanism so as to operate synchronously. The upstream conveyor 1 and the pressing belt device 1a constitute a divided supply conveyor 3.

Reference numeral 5 denotes a servomotor for driving the upstream conveyor 1 and the pressing belt device 1a. The servomotor 5 is connected to the upstream conveyor 1 via a speed reducer 6. The servomotor 5 is driven by a pulse signal from a control device 19 described later. The rotation speed and the rotation angle are controlled with high precision.

Reference numeral 7 denotes a transfer conveyor arranged on the downstream side of the upstream conveyor 1, and a belt conveyor 7a adjacent to the downstream end of the upstream conveyor 1 and a packing machine arranged in a downstream direction from an intermediate position of the belt conveyor 7a. 9 and a conveyor 8 with placement sections provided over a former 10. The conveyer 8 with a placement section has a plurality of attachments 12 for pressing workpieces attached at a predetermined pitch L1 to a chain 11 which can be driven in circulation. In addition, the conveyor 8 with the loading section and the front
The conveyor belt 7a is connected to the belt conveyor 7a in an interlocking manner, is driven by the driving source of the packaging machine 9 and is driven separately from the divided supply conveyor 3, and the transfer speeds of the conveyor 8 with the loading section and the belt conveyor 7a are the same. Is set to

Reference numeral 13 denotes an encoder serving as a signal generating means provided on a rotating shaft 14 which rotates once at one pitch of the attachment 12, that is, a desired number of encoders for each rotation of the rotating shaft 14. A pulse signal is generated and transmitted to a control device 19 described later. Reference numeral 15 denotes an origin signal for detecting the rotation of a cam 16 serving as a detection means provided on the rotation shaft 14 and transmitting an origin signal (one rotation signal) serving as a timing reference to the control device 19 for each rotation of the rotation shaft 14. 3 shows a transmitting sensor. Note that the angular phase of the cam 16 can be freely adjusted, and the detected portion of the cam 16 has a width so that one rotation signal is transmitted to the control device 19 for a predetermined time. .

Reference numeral 17 denotes a pressing belt device for the split supply conveyor 3.
A work detection sensor comprising a photoelectric sensor or the like provided in the upper position in the vicinity of the downstream exit of 1a so as to be vertically adjustable so as to be adjustable in the vertical direction. It is configured to be transmitted to.

Next, the control device 19 will be described. The control device 19 generates a driving pulse for driving the servo motor 5 based on the pulse signal transmitted from the encoder 13 and transmits the driving pulse to the servo motor 5. Has functions. Here, the drive speed of the divided supply conveyor 3 is set in proportion to the packaging operation speed of the packaging machine 9.

The control device 19 includes a work detection sensor.
When the signal from 17 is received, the transmission of the pulse signal to the servomotor 5 is stopped, and the sensor for transmitting the origin signal is also provided.
Upon receipt of the signal from 15, a predetermined pulse signal is transmitted to the servo motor 5 again, and the servo motor 5 is driven to the predetermined speed again. The control device 19 includes:
The one rotation signal of the origin signal transmission sensor 15 is input for a predetermined time, but the signal of the work 2 by the work detection sensor 17 is delayed from the one rotation signal of the origin signal transmission sensor 15, and If the signal of the work 2 is input to the control device 19 within this predetermined time, the control device 19 continues to send a pulse signal to the servomotor 5. This control uses a logic circuit that does not use a microcomputer.

Next, a control method in the above apparatus will be described in detail with reference to the timing charts of FIGS. For example, the standard length L of the workpiece 2 in the transfer direction A is 100 mm, and the pitch L1 of the attachment 12 is 2 mm.
00 mm respectively, and the packaging machine 9
Is packed at 60 packs / min (1 pack / sec), the transfer conveyor 7 is driven at a speed of 200 mm / sec.

In addition, the driving speed of the upstream conveyor 1 is set to 1
00 + αmm / sec (α> 0). Drive speed 10
The reason for setting 0 + αmm / sec will be described below. Assuming that there is no error in the length of the work 2 and that there is no timing deviation between the transfer conveyor 7 and the divided supply conveyor 3, the driving speed of the upstream conveyor 1 is set to 100.
If the speed is set to mm / sec, all the works 2 can be reliably supplied from the upstream conveyor 1 to the transfer conveyor 7, but in reality, there is a slight error in the length of the work 2 or the transfer conveyor 7 And the upstream conveyor 1 have a timing difference.

Therefore, it is necessary to correct the timing difference for each work 2, and the work 2 transferred to the upstream conveyor 1 is transferred to the belt conveyor 7 a of the transfer conveyor 7.
To arrive at the downstream end of the upstream conveyor 1 earlier than the receiving timing of the upstream conveyor 1 and decelerate the upstream conveyor 1 and the pressing belt device 1a, and correct the timing by increasing the speed before stopping. I have.

When a large number of works 2 are supplied to the upstream conveyor 1 under the above conditions, each work 2 is transferred on the upstream conveyor 1 in a pressing state where the front and rear end faces abut each other. The upper end of the work 2 is pressed by the upstream conveyor 1 and the pressing belt device 1a without slippage by the upper surface thereof being pressed by the pressing belt device 1a, and the tip 2a of the work 2 reaching the downstream end of the pressing belt device 1a is removed. The work detection sensor 17 detects.

The signal of the work detecting sensor 17 is supplied to a control device.
When transmitted to 19, the control device 19 stops transmitting the pulse signal to the servo motor 5. Here, a pooled pulse is generated in the servomotor 5 due to a delay in rotation at the rising edge, and the pooled pulse is generated by the servomotor 5.
As a result, the transfer speed of the upstream conveyor 1 and the pressing belt device 1a is reduced (part in FIG. 3).

On the other hand, the packaging machine 9 is operating at a predetermined working speed, and therefore, the transfer conveyor 7 also operates at a constant speed.
The detected portion of the rotating cam 16 is detected by the rotating device 15, and one rotation signal is transmitted to the control device 19. Since the control device 19 transmits a predetermined pulse signal to the servomotor 5 again by the one rotation signal, the servomotor 5 increases the speed of the upstream conveyor 1 and the pressing belt device 1a holding the work 2 to a predetermined speed. (Part in FIG. 3), upstream conveyor 1
The timing of the transfer conveyor 7 and the work 2
Is supplied to the transfer conveyor 7 from the divided supply conveyor 3 whose speed has been increased.

The correction of the supply timing is performed without stopping the upstream conveyor 1 and the pressing belt device 1a as described above.
Can be smoothly supplied, and pulsation of the work 2 located on the upstream side can be prevented.

Further, the work 2 transferred to the belt conveyor 7a is supplied between the attachments 12 of the divided supply conveyor 3 rotating at the same speed as the transfer conveyor 7. The work 2 separated from the belt conveyor 7a is pressed by the attachment 12, supplied to the former 10 at a predetermined interval, and pillow-wrapped by the wrapping film 23.

In the above case, the case where the detection signal of the work 2 by the work detection sensor 17 is transmitted to the control device 19 faster than the one rotation signal of the transfer conveyor 7 has been described. Due to the length of the workpiece 2 being longer than the length or a transfer error of the workpiece 2 on the upstream side, the signal of the workpiece 2 by the workpiece detecting sensor 17 is transmitted to the origin signal transmitting sensor 15.
May be delayed from the one-rotation signal.

In this case, only by comparing the input timings of the two signals, as shown in FIG. 4, the controller 19 transmits the pulse signal to the servomotor 5 until the next one rotation signal is input. But not for this, attachment
There is a possibility that one pitch of 12 becomes empty. However, since the apparatus of this embodiment has the width T1 in the reception time of one rotation signal, even if the control device 19 receives the work detection signal after receiving the signal, the rotation signal of the one rotation signal is received. During reception, the control device 19 continues to send a pulse signal to the servomotor 5 to operate the servomotor 5.
Therefore, the work 12 can be attached 12 without interruption.
It is possible to reliably supply in between. Also,
The origin signal transmitting sensor 15 is connected to the rotating shaft 14 of the transfer conveyor 7.
Since the configuration is such that one rotation signal of the cam 16 provided in the sensor is detected, there is an advantage that the structure is simple and reliable detection is possible.

In this embodiment, the servo motor 5 is used as described above.
Is stopped, and before the servo motor 5 stops, the servo motor 5 is driven again by one rotation signal. Therefore, as shown in FIG. 3, if the rotation signal of the origin signal transmitting sensor 15 generates one rotation signal slowly, the rotation of the servomotor 5 stops, and the upstream conveyor 1 and the pressing belt device 1a may also stop.

However, the case where one rotation signal is input to the control device 19 after the upstream conveyor 1 and the pressing belt device 1a are stopped means that the packaging machine 9 is operated at a low speed, and accordingly, the divided supply conveyor 3 and the The transfer conveyors 7 are also rotating at a low speed. Therefore, the pulsation of the work 2 on the upstream side is negligible, and does not hinder the supply of the work 2 at all.

The present invention is not limited to the above-described embodiment. For example, the signal generating means is not limited to the encoder 13 but may be a tachogenerator. Become.

Further, in the above-described embodiment, the one rotation signal is transmitted to the control device 19 for a predetermined time by giving a width to the detected portion of the cam 16, but a timer is provided to transmit the origin signal. The signal from the sensor 15 is sent to the control device 19 for a predetermined time.
May be transmitted. Furthermore, the origin signal is
Although the rotation of the rotation shaft 14 is detected and a timing reference is taken for each rotation of the rotating shaft 14, the origin signal may be obtained from a microcomputer output of the packaging machine 9 synchronized with the transfer conveyor 7,
It is needless to say that a DC or AC servomotor can be employed as the servomotor 5, and other components are not limited to those in the above embodiment.

[0032]

According to the present invention , the work detecting sensor detects the leading end of the work which has reached the downstream end of the divided feeding conveyor.
The control device stops sending signals to the servomotor.
Stop, and the servo motor is split
Slow down the feed conveyor and stop the split feed conveyor.
Before the work is transferred from the split supply conveyor to the transfer conveyor
The origin signal, which is the timing reference for supplying
Detects the rotation of the detection means provided on the rotating shaft of the conveyor
Is transmitted from the origin signal transmission sensor to the control device,
The control device sends a drive pulse signal to the servomotor again.
In order to increase the speed of the divided supply conveyor to a predetermined speed , when the work is divided and supplied from the upstream divided supply conveyor to the transfer conveyor, the divided supply conveyor is not intermittently fed. Can be smoothly supplied, and the pulsation of the work on the upstream side of the divided supply conveyor or the like can be effectively prevented. In particular, as the work is transferred at a higher speed, the effect becomes more remarkable, and the speeding up of the apparatus can be easily achieved.

Further, the present invention can be performed by a simple logic circuit or the like for controlling a servo motor by an on / off signal, and has a simple structure as compared with the case where microcomputer control is performed.
There is an advantage that the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a split feeder showing one embodiment of the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a timing chart in a case where a signal of a work detection sensor is transmitted to a control device faster than a signal of an origin signal transmission sensor.

FIG. 4 is a timing chart in a case where a signal of a work detection sensor is transmitted to a control device later than a signal of an origin signal transmission sensor.

FIG. 5 is a schematic front view showing a conventional example.

[Explanation of symbols]

2 ... Work, 3 ... Divided supply conveyor, 5 ... Servo motor, 7 ... Transport conveyor, 13 ... Encoder, 16 ... Cam, 17
... workpiece detection sensor, 18 ... detection means, 19 ... control device

Claims (1)

(57) [Claims] 1. A conveyor for dividing and supplying a plurality of works (2).
(3) In order to receive the transfer conveyor (7) from the servo motor that independently drives the transfer conveyor (7) (5) is connected to the divided supply conveyor (3), the transfer
The signal is proportional to the rotation speed of the conveyor (7).
Work of the robot motor (5) controlled by the controller (19)
In the split feeding method , the tip of the work (2) reaching the downstream end of the split feeding conveyor (3) is detected.
When the control sensor (17) detects, the control device (19)
Signal transmission to the servo motor (5),
(5) is divided supply conveyor by discharge of accumulated pulse
(3) is decelerated and the split supply conveyor (3) stops.
Previously, transfer conveyor from said split supply conveyor (3)
It becomes a timing reference for supplying the work (2) to (7).
The origin signal is the rotation axis (14) of the transfer conveyor (7).
Origin signal transmission to detect the rotation of the detection means provided in
When sent from the sensor (15) to the control device (19),
The device (19) again drives the servo motor (5) for driving pulses.
Send a signal to move the split feed conveyor (3) to a specified speed
A method of dividing and supplying a work, wherein the speed is increased .