JPS6222360Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field in which the Invention is Used] This invention relates to a device that stacks manufactured bags one after another on a pedestal and stores them in an orderly manner.

[Prior art and its problems]

In conventional well-known bag making machines, flat tubes manufactured by the inflation method are transported by a fixed size by a pair of intermittent conveyors,
Each time the conveyor stops, the part is welded in the transverse direction, and the part sent out from the intermittent conveyor is cut from near the welded part, and the bags are successively made into bags and stacked on a pedestal, or the film is made into a strip. The bags are folded in half or folded while being conveyed intermittently on a conveyor, and each time the conveyor stops, they are welded in the transverse direction using a knife edge or heated wire to form bags in sequence.
They are transferred one by one onto a pedestal using a conveyor that operates continuously or intermittently, and are stacked and arranged in order.

Each time a predetermined number of sheets are stacked, a buzzer sounds and the sheets are manually removed from the pedestal, or an automatic conveyance device is used to remove them each time.

However, such a known device requires manpower and requires frequent operation of the automatic conveyance device, which is not preferable from the standpoint of labor and energy conservation.

Accordingly, a device has already been published that lowers the pedestal by a predetermined distance each time a specific number of bags are stacked on the pedestal. As an example, Jikko Sho 49-10621
There is a publication.

However, in this device, the pedestal is lowered by a fixed size regardless of the thickness of the bag fabric, so the difference in height between the delivery height and the surface of the top layer of bags stacked on the pedestal is not necessarily optimal. If this difference in height is too large, the bags will not be aligned, and if it is too low, the next bag that is being sent out will come into contact with the stacked bags, causing the bags to become disordered and stacking impossible.

In order to solve these drawbacks, it is conceivable to simply install a level sensor that detects the level of the top layer of bags, but this sensor incorrectly detects the falling bags that are being stacked one after another from above and outputs an activation signal. However, there is a risk of accidentally lowering the pedestal.

〔the purpose〕

This invention ameliorates the drawbacks of the previously known devices and other solutions, in particular without detecting the level of bags floating and falling from the delivery conveyor until they are stacked on the pedestal, and which constantly The pedestal is positioned at a height that matches the thickness and bulk, so that a large number of bags can be made accurately, for example.
It is designed to allow about 50,000 to 20,000 sheets to be stacked.

[Means for solving problems]

This invention is a device in which a substantially horizontal pedestal is provided on the discharge side of a bag delivery conveyor of a bag making machine, and the pedestal is provided so that its height can be changed by a lifting device. A photoelectric level sensor is fixed to the machine frame at a position slightly lower than the delivery position of the bag delivery conveyor, and is used during the remainder of the delivery period excluding the initial non-delivery period of the conveyor. A signal switch is provided that outputs an output signal once every cycle during the first half of the bag delivery period, and uses an AND signal of the sensor's ON signal and the signal switch's ON signal as an input signal to operate the hoisting device. The above problems have been solved by a bag making machine equipped with an automatic stocker, which is characterized by being equipped with a control device for a lifting device that lowers the table.

[Effect]

Since this device is constructed as described above, first, before starting operation, operate the lifting device and move the pedestal to the highest bag receiving position, that is, the height of the empty pedestal. Set it at a position slightly lower than the optimum position of the photoelectric level sensor.

When the bag making machine is operated, the bags fall onto the pedestal one after another at the beginning of the conveyor's delivery period and the subsequent stop period. be done.

However, during this period, since the signal switch is off, no command input signal is issued to the control device that operates the hoisting device.

Next, in the latter half of the conveyor's non-feeding period, excluding the initial period, the bags settle on the pedestal and are in a stable state.

In this way, the bags are stacked one after another on the pedestal, and when the level rises and the photoelectric level sensor emits an output signal during the later transport of the conveyor's non-feeding period, the signal switch also emits an output signal at this time. Therefore, the control device of the hoisting device receives an input signal, and the hoisting device begins to lower the pedestal, but if the photoelectric level sensor turns off due to the descent of the pedestal, the input signal to the control device turns off. Then, the lifting device stops and the pedestal stops at that position.

The following bags are stacked on a pedestal, and the pedestal is lowered while the photoelectric level sensor outputs an output signal when the topmost bag in the stack is activated by the signal switch, excluding the initial non-feeding period of the conveyor. do.

〔effect〕

In this device constructed and operated as described above, the bag-making machine is controlled by the control device having the above-mentioned construction so that the bags are delivered by the delivery conveyor, and the bags are sequentially stacked neatly on the pedestal, and the height of the bags is adjusted. reaches the height of the sensor and the signal switch issues an output signal at this time to lower the pedestal, so the height between the delivered bag and the top surface of the bag on the pedestal is always appropriate. maintained at a certain height.

More specifically, the ON signal of the sensor is ANDed with the ON signal of the signal switch by the synchronous cam, which is operated once during the remaining delivery period excluding the initial non-delivery period of the conveyor or the subsequent bag delivery period. Since a control device is provided for the lifting device which lowers the pedestal only by a signal, the signal turns on said sensor when the bag discharged from the discharge conveyor is lowered at the beginning of the non-feeding period of the conveyor. There is no risk of malfunction such as the pedestal falling when the pedestal is pressed only.

In addition, when the pedestal descends and the sensor turns off, the pedestal stops, so there is no risk of the pedestal descending too far, and the pedestal is stacked to accommodate bulky applications, regardless of the thickness of the bag material or the size of the delivery pitch. can be maintained at an appropriate height.

[Embodiment]

The invention will now be explained based on the illustrated representative embodiment.

In the figure, reference numeral 10 denotes a bag making machine, which conveys a synthetic resin bag material belt 12 by a pair of intermittent conveyors, which is a type of bag delivery conveyor 11.
The bag is transferred by a predetermined size (length or width) at a time.
Each time the conveyor stops, a welding device 13 welds the bag material belt 12 in the cross direction, and at the discharge side of the transfer conveyor 11, a cutting device 14 cuts the vicinity of the seal portion welded in the cross direction, forms bags, and the bags 15 are stacked in sequence on the receiving table 16 of the autostocker.

The illustrated pedestal 16 can be moved up and down by a lifting device 17 consisting of a hydraulic elevator, and a hydraulic pump 18 is driven to feed oil into a hydraulic cylinder 19 to raise the pedestal 16. By closing the solenoid valve 20, the pedestal 16 is stopped in place, the solenoid valve 20 is activated, and the hydraulic cylinder 1
By allowing the oil to return to the tank 21 from 9,
The pedestal 16 is provided so as to be lowered by its own weight and the weight of the groups of bags 15 on the pedestal 16.

22 is a photoelectric level sensor, and a pedestal 16
It is installed in the machine frame of the bag making machine 10 on both sides above, with a projector on one side and a light receiver on the machine frame on the other side, and the beam of light shining on the light receiver is horizontal. Bags 15 are sent out by conveyor 11.
It is provided so that it is slightly lower than the height of , that is, about 1 cm to 2 cm below. The height of the projector and receiver is set such that the vertical position can be slightly changed and fixed with respect to the machine frame. For example, it can be moved and fixed along a vertical guide provided on the machine frame.

The above-mentioned transfer conveyor 11 has a crank 24 provided on the main shaft 23 which normally rotates continuously, and converts the movement of the crank 24 into a reciprocating movement of a fan-shaped gear 25.
Only the rotation in the transfer direction is connected via a one-way clutch or an electromagnetic clutch, so that the rotation in one direction is performed at intervals.

A synchronous cam 26 is fixed to the main shaft 23, and contacts a signal switch 27, which is a micro switch fixed to the frame of the bag making machine, once per cycle, and closes the signal switch 27 once per cycle. The timing is such that the signal switch 27 is closed once during the remainder of the stop period of the conveyor 11 excluding the initial period or the first half of the transfer period following the said period.

The operation of such an embodiment will be explained together with the control device 28 for the hoisting device.

First, before starting operation, turn on the motor switch SW ₁ of the pump 18, drive the pump 18, and at the same time energize the solenoid SOL-2 of the solenoid valve 20 to switch the solenoid valve 20, and drive the oil into the cylinder. 19, the pedestal 16 is raised, and when the upper limit position is reached, a partially movable member in the lifting device 17 turns on the limit switch LS-3, stops driving the pump 18, and , the solenoid valve 20 is returned to the neutral position, the oil supply to the cylinder 19 is cut off, and the pedestal 16 is stopped at the upper limit position, that is, the highest position.

The highest position of this pedestal 16 is preferably a position slightly lower than the height of the photoelectric sensor 22.

Next, remove your finger from this motor switch SW ₁ ,
Turn this off.

When the bag making machine 10 is operated, the bags 15 are stacked one after another on the pedestal 16, and when the signal switch 27 is turned on to the synchronous cam 26 fixed to the main shaft 23, the sensor 22 outputs an output signal. When turned on, the solenoid SOL ₁ of the solenoid valve 20 is energized by these AND signals, the solenoid valve 20 is switched so that the oil in the cylinder 19 communicates with the tank 21, and the oil in the cylinder 19 is transferred to the tank. 2
1 and lower the pedestal 16.

When the sensor 22 is turned off due to the lowering of the pedestal 16, the solenoid SOL ₁ of the solenoid valve 20 is deenergized and the solenoid valve 20 is returned to the neutral position where the supply of oil to the cylinder 19 is cut off.

If the bag making machine 10 continues to operate and the sensor 22 is turned on again while the signal switch 27 is on, the pedestal 16 is similarly lowered. This operation is repeated until the pedestal 16 reaches the lowest position, and when the pedestal 16 reaches the lowest position, that is, the lower limit position, the limit switch LS ₂ detects this, and the bag making machine 1
Stop 0.

During the above-mentioned operation, the light beam of the photoelectric sensor 22 is blocked once while the bag 15 sent out from the conveyor 11 is falling, and the sensor 22 issues an on signal, but this period is different from the non-feeding period. Since it is an initial stage, the signal switch 27 is off, and no signal is output from the AND element, so the solenoid valve 20 continues to maintain the neutral position. As a result, the pedestal 16 does not descend.

[Effects specific to embodiments]

This embodiment has the following unique effects in addition to the effects of the above invention.

The control device 28 for the lifting device 17 that lowers the pedestal 16 only energizes the solenoid for switching the electromagnetic valve 20 for returning the oil in the hydraulic cylinder 19 to the tank 21. Since the weight of the bags 15 above is used, the consumption of electrical energy for lowering is small, and the pedestal 16 can be fixed simply by setting the solenoid valve 20 to the neutral position. No electricity or other motive power is required.

In the above-mentioned embodiment, the delivery conveyor 11 is explained as an example of intermittent operation, but if the delivery conveyor is in continuous operation, the delivery period is the period in which the bags 15 are actually delivered, and the delivery period is the period in which the delivery conveyor is in operation. The non-feeding period is the period when the bag is not being fed out even if the bag is being fed out, and even if such a device is used, the invention remains the same.

Separator tape 4 for each predetermined number of bags 15 sent out by the bag making machine equipped with the automatic stocker of the present invention
An example of use with device 40 for inserting 1 will now be described.

First, the structure of this device 40 will be explained, and then its operation will be explained.

Immediately above the delivery conveyor 11, a tape delivery conveyor 42 is installed in the same direction as the bag material strip 12 to be sent out, toward the cutting section of the cutting device 14. The setting value of the cycle counter for counting (for example, a number such as 10, 20, . . . or 50, or any other arbitrary number), and when feeding out the bag material strip 12, the tape feeding conveyor 42 is controlled by an independent motor 43. actuated by the tape 41
For example, a bag making machine of 10
It is cut together with the bag material strip 12 by a cutting device 14.

A device 40 for inserting this tape is a device for inserting the tape into the bag material strip 1.
It is designed to be able to slide along two horizontal guides 44 in the transverse direction, and usually two or three are provided, each of which can be independently movable and fixed along the guides 44.

Such a tape insertion device 40 is particularly effective if the pedestal 16 is always in the correct position.

After all, the area of the cut piece 46 of the tape 41 is small, about 4 cm x 5 cm at most, and the area of the cut piece 46 of the tape 41 is small, about 4 cm x 5 cm.
Since the cut pieces 46 are cut and fall together with the bag, if the falling height is not about 2 cm or less, there is a risk that the cut pieces 46 will separate from the bag and blow. However, when combined with the above-mentioned device, the head difference can be reduced and the bag can be positioned between the bags, resulting in an excellent effect. Further, there is no need to provide a separate cutting device, and a single bag delivery conveyor can be used to transport three or more bag material strips 12.

[Brief description of the drawings]

The drawings relate to this invention, and Figure 1 is
FIG. 2 is a front view showing the relationship between the level sensor and the pedestal, FIG. 3 is a logic diagram of the control device, and FIG. The figure is a plan view showing the relationship between the tape insertion device and the bag making machine of the present invention. Symbols in the figure: 10...Bag making machine, 11...Bag delivery conveyor, 12...Bag material band, 13...Welding device, 14...Cutting device, 15...Bag, 15...
pedestal, 17... lifting device, 19... hydraulic cylinder, 20... solenoid valve, 22... photoelectronic level sensor, 23... main shaft, 26... synchronous cam, 27...
...Signal switch.

Claims (1)

[Claims for Utility Model Registration] (1) In a device in which a substantially horizontal pedestal is provided on the discharge side of the bag delivery conveyor of a bag making machine, the height of the pedestal is increased by a lifting device. is displaceably provided, and a photoelectric level sensor is fixed to the machine frame at a position slightly lower than the delivery position of the bag delivery conveyor. A signal switch is provided that issues an output signal once every cycle during the delivery period or the first half of the subsequent bag delivery period, and an AND signal of the on signal of the sensor and the on signal of the signal switch is used as an input signal, A bag making machine equipped with an automatic stocker, characterized in that a control device for the lifting device is provided to operate the lifting device and lower the pedestal. (2) Registration of a utility model characterized in that the hoisting device is a hydraulic elevator, and the control device for lowering the hoisting device opens and closes a valve for removing oil from a hydraulic piston in response to the AND signal. A bag making machine equipped with an automatic stocker according to claim 1. (3) The bag making machine equipped with an auto stocker according to claim 1 of the utility model registration claim, wherein the delivery conveyor is one of a continuous operation type and an intermittent operation type.