JPH01294415A - Method and apparatus for automatic packaging - Google Patents

Abstract

PURPOSE:To impart to adjusting members a rapid and effective flexibility to change their setting conditions with response to articles to be packaged, by changing the setting conditions thereof to meet differences of the articles from the memory stored regarding the previous setting conditions thereof. CONSTITUTION:A required article number is inputted. This signal is applied to a memory yard 1 and an arithmetic circuit 2, whereby the setting conditions of each of the adjusting members A1-An corresponding to the article number retrieved from the memory yard 1 is inputted into the arithmetic circuit 2. The arithmetic circuit 2 retrieves the setting conditions of each of the adjusting members at the end of the operation from a memory yard 3 for computing the differences in the setting conditions between these adjusting members. In doing so, a drive circuit 4 activates all drive mechanisms B1-Bn simultaneously, whereby a pulse signal generated from each of pulse generators 10a-10n is inputted into a drive circuit 7. The drive circuit 7 integrates them respectively and, when the difference between the integrated and preset values becomes zero, energizes a stopping circuit 9 to effect a selective operation of normally closed contact point E1-E2 for stopping said drive mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic packaging method and apparatus for various packaging machines connected to various filling machines such as an overlap packaging machine, a row packaging machine, or a blister filling machine.

[Prior art] As an example of a packaging machine, an overview of an overlap packaging machine is given in Part 6.
As shown in FIG. This packaging machine 50 is provided with a receiving table 52 facing an incoming container 51 into which box-shaped articles W are sent, and a lateral extruder 53 is provided on this table 52. Reference numeral 54 denotes guide plates for regulating both sides of the articles carried in by the carry-in conveyor 51. A slide table 55 is provided opposite to the receiving table 52, a vertical extruder 56 is provided on this table, and a delivery table 57 is provided opposite to the table 55 with a gap therebetween.
hang down.

58 is a feed guide plate that sandwiches the feed table 57;
9 is a film feeding mechanism, 60 is a film cutter, 6
1 is a seek plate, and 62 is a press plate that presses the article on the delivery q table 57.

However, when packaging the product W, the acceptance guide plate 54.54
, the stroke of the lateral extruder 53, the distance between the feed guide plates 58 and 58, the length of the film to be fed out, the rise and lateral reciprocating distance of the seek 61, the lowering position (pressing position) of the presser plate 62, etc. (hereinafter, these are determined) are collectively referred to as adjustment members)! ! Set the dimensions to suit the product (hereinafter referred to as setting conditions). After that, when the number of products W sent by the carry-in conveyor 51 reaches a predetermined number, the transverse extruder 53
It is pushed out onto the slide table 55 by. Next, the slide table 55 is advanced to approach the delivery table 55, and the product W is pushed out onto the delivery table 57 by the vertical extruder 56. At this time, the product W is sent out onto the table 55 so as to wrap around the hanging film F, the film F is cut by the cutter 60, the top surface of the product is covered and fixed by the film F by the presser plate 62, and the guide piece 63 The lower end of the film is pushed up, the front and back ends of the film are overlapped, and the seek 61 is raised to weld.

[Problem to be solved by the invention]

Each of the above adjustment members needs to be adjusted to a predetermined setting condition position for each product. For this reason, adjustment has conventionally been done manually, but there are problems such as the need for extremely laborious work.

For this reason, attempts have recently been made to use a computer to store product-specific setting conditions for each adjustment member, and to operate each adjustment member to achieve a predetermined setting condition simply by inputting the product number. However, for boat fishing, first set each adjustment member to the origin (
Although a method has been adopted in which the device returns to the reference position (also referred to as a reference position) and then shifts to predetermined setting conditions, it has the disadvantage that returning to the origin requires time.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to quickly and effectively change the setting conditions of an adjusting member for a packaged product.

[Means to solve the problem]

In order to achieve the above object, in the packaging method of the present invention, an adjustment member is set to adjust each product to a required position in a packaging machine such as an overlap packaging machine or a bag making machine that sequentially sends out products and wraps them with a film. remember the conditions,
Based on the setting conditions of each adjustment member at the end of packaging work, calculate the difference between the setting conditions of the above-mentioned members for the next product, drive each member simultaneously to change the conditions, and move each member to the setting condition position. It was designed to stop.

Further, the packaging device according to the second invention includes an adjustment member to be adjusted according to the dimensions for packaging products of different dimensions, such as a film feeding member, a drive mechanism therefor, and an operation circuit, and the operation circuit includes a drive mechanism and an operation circuit for each product. a memory yard for storing the setting conditions of the adjustment member; a storage yard for the current setting conditions of the member at the end of packaging work; and an arithmetic circuit that calculates the difference in the new product setting conditions based on the current setting conditions by inputting a new product number. The drive mechanism of each adjustment member is driven simultaneously, and the difference distance is shifted in each desired direction.

The drive mechanism may include a pulse generator such as an encoder that emits a pulse signal in proportion to the distance traveled, and the operating circuit may integrate the pulse signals to calculate the amount of travel and compare it with the difference distance.

Further, each drive mechanism may be driven by a pulse current generated by a pulse generator, and the operating circuit may integrate the number of pulses to calculate the amount of movement of the adjustment member.

Further, it is preferable that the operating circuit includes a means for sorting out the magnitude of the amount of movement of each adjustment member and arranging the size order of the amount of movement.

The operating circuit also includes means for determining the forward/reverse rotation of the drive mechanism based on the difference between the current condition of the adjustment member at the end of the work and the setting condition for the input product number, and selectively operates the forward/reverse switch for the drive mechanism operating motor. It is preferable.

Note that when the ratio between the amount of movement of the adjusting member and the cumulative amount of pulses of the drive machine (chopsticks) is non-linear, the operating circuit calculates the recent value by dividing both into multiple parts and linearizing the divided sections. It is preferable to include an arithmetic circuit.

Furthermore, it is preferable that the operating circuit includes means for correcting backlash by moving the adjusting member further backward from the set condition position and then moving forward to the position when moving the adjusting member in the reverse direction.

[For production]

When switching packaging products, each adjustment member is converted to a predetermined setting condition based on the current position. In this case, y
By providing a pulse generator in the A phasing material drive mechanism, it functions as a means for measuring the migration distance.

Note that when each drive mechanism is driven by a pulse current generated by a pulse generator, the distance traveled by each adjustment member can be measured by integrating the number of pulses.

Furthermore, by rearranging the amount of movement of the adjusting member in order of size, it is easy to determine when to stop.

Furthermore, the adjustment members move in either the forward or reverse direction to make a transition based on the current value, and a forward/reverse changeover switch is provided as a selection means, and by switching this, each member can be moved in the forward or reverse direction at the same time. migration and reduce operation time.

In this case, when moving in the reverse direction, backlash can be corrected by moving slightly backward beyond the set condition and then moving forward to the desired position.

〔Example〕

1 to 4 show a first embodiment. This embodiment is applied to the above-mentioned overlap packaging machine 50, and the above-mentioned adjusting members such as the film feeding mechanism 59 are operated by a computer. FIG. 1 is a schematic block diagram of the operation procedure.

The operating circuit CPU includes a storage yard 1 for storing setting conditions for each product, an arithmetic circuit 2, and a current setting condition storage yard 3 (hereinafter referred to as "time storage yard") for temporarily storing setting conditions at the end of work.

The arithmetic circuit 2 is connected to each W@phasing material 1. A2 . . . A transition distance for An is calculated and applied to the drive circuit 4. The drive circuit 4 includes a forward/reverse rotation determining means 5 for determining the forward/reverse running direction of each adjustment member, and operates forward/reverse changeover switches 7a to 7n provided on each adjustment member drive power fI6, and then switches the drive power source 6 to The provided main switch is closed, and each adjustment member AtxAn is activated simultaneously, and each is stopped when a predetermined setting condition is reached. Note that each adjustment member AI-An is provided with drive mechanisms B1 to Bn including motors M1 to Mn, respectively. This drive mechanism is such that the adjustment member is moved via the sliding pieces DI, D2, D3, etc. by the rotation of screw rods C1, C2, etc., and the adjustment member AI is the aforementioned population guide. A plate 54.54 is shown, a left-right thread is carved in the screw rod C1, and the guide plate 54.54 moves synchronously in the expanding or contracting direction depending on the length of the product W by rotation of the motor M+.

Further, the adjustment member A2 indicates a lateral extruder 53, in which a press plate 53a is attached to the screw rod C2 via a sliding piece D3, and the press plate 53a is moved back and forth by the rotation of the motor M2, and the product is centered when extruded. is adjusted so that it coincides with the center line of longitudinal extrusion by the longitudinal extruder 56.

Other drive mechanisms B3 to Bn are omitted with motors M3 to Mn. Note that 10a, 10b, . . . indicate pulse generators such as encoders, and screws C1, C
A pulse is generated in accordance with the rotation angle of No. 2, that is, the amount of movement of the adjustment member back and forth, and is fed back to the drive circuit 4.

The operating procedure will be explained below based on the run mode shown in FIG. First, input the required product number. This signal is applied to the storage yard 1 and the arithmetic circuit 2, and the setting conditions of each adjustment member A I-A n corresponding to that number are extracted from the storage yard 1 and input to the arithmetic circuit. The arithmetic circuit 2 retrieves the adjustment member setting conditions at the end of the work from the temporary storage yard 3, compares the two, and calculates the difference. Ql
-Qn indicates the difference with respect to each adjustment member A1 to An. This Ql-Qn has both positive and negative values. However, plus means the amount of shift in the direction of larger numbers, and minus means the amount of shift in the direction of smaller numbers.

Next, the absolute values of the differences Ql-Qn are rearranged in order from the smallest value to the largest value. This is to facilitate the calculation of each adjustment member using - number of calculation circuits.

At the same time, the plus and minus signals of the difference Q1xQn are applied to the drive circuit 4, and the drive circuit 4 operates the forward/reverse rotation determining means 5 to selectively switch each of the forward/reverse changeover switches 7a to 7n. The differences Q1 to Qn are also applied to the drive circuit 4. As a result, the drive circuit 4 activates the starting circuit 7, closes the main switch 8, and simultaneously drives all drive mechanisms 81 to Bn.
Pulse signals emitted from each of 0a to Ion are input to the drive circuit 7.

The drive circuit 7 integrates each, and when the difference from the set value (difference value Q) becomes O, activates the stop circuit 9 and closes the normally closed contact El-E.
2 is selected and activated to stop the drive mechanism.

When all the drive mechanisms Bl-Bn stop, a termination signal is applied to the arithmetic circuit 2, and the arithmetic circuit 2 inputs the newly input product setting conditions to the setting condition storage yard 3 and stores them, thereby ending the process. .

Note that the above embodiment shows an example in which the difference Q values are rearranged and stored in the order of magnitude, but when the arithmetic circuit 2 is equipped with a large number of calculation functions that perform calculations for each adjustment member, there is no need to rearrange them. .

Furthermore, when rotating in the negative direction (reverse direction), there is backlash between the threaded rod and the sliding piece or between the reduction gears, which may cause an error between the number of pulses and the actual transition distance.

In order to correct this, when rotating in reverse, the motor rotates a certain distance further than the difference Q value and then stops, then shifts to forward rotation, shifts to the set value, and stops.

In addition, in the drive mechanism 81xBn, the relationship between the number of pulses and the transition distance is not necessarily linear like the relationship between a screw rod and a sliding piece. For example, it may be driven via a cam or an arc, and the relationship may be non-linear. An example of this is shown in FIG.

Reference numeral 20 denotes a guide groove 2 which is attached to a sliding piece 22 that is screwed into a threaded rod 21, and which is carved in the drive plate 23 in the radial direction.
4 is fitted. This piece 20 also fits into a fork 26 attached to a driven shaft 25, the rotation of the drive plate 23 swings the fork 26, and the back and forth movement of the piece 20 along the guide groove 24 is caused by the fork 26. change the swing angle. A drive gear 27 is attached to the driven shaft 25, which meshes with the driven gear 28 to rotate the film delivery roller 30 via a chain 29. 31 is a pressure roller, which comes into contact with the feeding roller 30 and clamps the film F;
The rotation of the feeding roller 30 feeds out the film F, or separates the film F to allow the feeding roller to move back.

Note that 32 is a pulse generator, and M is a drive motor.

In this case, the ratio between the movement of the sliding piece 22, that is, the rotation of the threaded rod 21, and the circumferential speed of the feeding roller 30 is non-linear.

In this case, the number of pulses and the above-mentioned circumferential velocity may be calculated by using a calculation formula, but they may also be replaced by approximate values. The procedure is shown in Figure 4. The figure shows the pulse count number and transition distance (
In this example, the relationship between the rotation angle of the feeding roller and the rotation angle of the feeding roller is shown, and the relationship between the two is shown by a curve F.

This curve Fji: is multi-divided and the dividing point is a.

b, c... Then, calculate the count number Pa and transition distance ia for point a, and set the distance fa in this case to f
It is displayed as a=Ka*Pa. However, Ka is a coefficient and is obtained from actual measurements. And the distance between a and b is considered to be a straight line, and the coefficient K
Calculate by applying a. Next, for point b, calculate the count number Pb that increases from point a and the transition distance or 1, 2
It is expressed as b=Kb-Pb. However, Kb is a coefficient.

Similarly, for point 0, 1c = Kc - Pc, and for point d, d = Kd - Pd... Therefore, in the figure, shi = Ka - Pa + Kb 豐Pb + KcΦPC + Kd - Pd
+ is set to d-P (Δd).

In addition, 35 in the figure is a manual operation circuit, and the selection switch 36
It is connected to the required drive mechanism Bl-Bn and driven by opening/closing switch 37, and is applied to fine adjustment.

Next, FIG. 5 shows a second embodiment. In this embodiment, the motors N1 to N of the driving machines 11GI to Gn of the adjustment members A1 to An are
Let n be a pulse motor, - pulse generators PG
The controller is driven by pulses sent from the controller, and the pulse signals are also applied to the operating circuit CPU.

In this case, each drive mechanism G1 to Gn does not require a pulse generator such as an encoder as shown in the previous example. That is, the starting circuit 7 opens and closes the main switch 40 as well as a switch 41 provided in the input circuit for the operating circuit CPU. As a result, each of the drive mechanisms G1 to Gn is driven, and the drive pulses are integrated in the operating circuit CPU, and each adjustment member AI-An is stopped at the set position in the manner described above. In this case, as in the previous example, when the absolute values of the differences Q are rearranged in order from the smallest value, all the calculations can be performed with one calculation function.

In the figure, parts that are the same as those in the previous example are given the same reference numerals, and explanations thereof will be omitted.

〔Effect of the invention〕

The present invention has the following effects.

When changing the setting conditions of the adjustment member for packaging different products, the previous setting conditions are memorized and the conditions are changed based on this, so the predetermined conditions can be changed after returning to the conventional origin (or reference point). Unlike the previous method, the distance traveled can be shortened and conditions can be changed quickly.

Furthermore, by providing a pulse generator such as an encoder in the drive mechanism of the adjusting member and calculating the number of pulses using an operating circuit, it is possible to accurately measure the amount of movement of the adjusting member.

Further, by driving the drive mechanism in pulses using a pulse current generated from a pulse generator as a drive power source, and by integrating the number of pulses in an operating circuit, it is possible to simplify the measurement of the distance traveled by each adjustment member.

Furthermore, by rearranging the migration distances of all adjustment members in order of size, calculations can be simplified.

In addition, the adjustment members move in the plus direction and the minus direction, respectively, based on the previous setting position, and by selectively switching the forward/reverse selector switch, when the power is turned on, each adjustment member simultaneously moves in the required direction, allowing operation. You can measure time savings.

Furthermore, when the amount of movement of the adjustment member and the amount of integrated pulses of the drive mechanism are non-linear, the calculation can be made more quickly by providing an arithmetic circuit that calculates approximate values.

Furthermore, when moving from the current position in the negative direction, the backlash of the drive mechanism is corrected by moving further in the negative direction from the set condition position to a predetermined distance, then in the positive direction and moving to the set condition position. I can do it.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment, Figure 1 is a block diagram of the operation procedure, Figure 2 is a run mode diagram of the operation process, and Figure 3 is an example of the drive mechanism of the adjustment member. Explanatory diagram, Figure 4 is an explanatory diagram of approximate value calculation procedure in case of non-linear proportionality, and Figure 5 is
The figure is a block diagram of the operating procedure of the second embodiment, and Figures 6 and 7 are schematic explanatory diagrams of the overlap packaging machine.
The figure is a plan view thereof, and FIG. 7 is a front view thereof. CPtJ is an operation circuit, 1 is a storage yard, 2 is an arithmetic circuit, 7a to 7n are forward/reverse changeover switches, 10a to 10
n is a pulse generator, Al-An! 4 Adjustment member, Bl-B
n is a drive mechanism, and PG is a pulse generator. blasphemy

Claims (8)

[Claims] (1) In packaging machines such as overlap packaging machines and bag making machines that sequentially send out products and wrap them with film, the setting conditions of the adjustment members that are adjusted to the required positions for each product are memorized, and each product is Based on the setting conditions of the adjusting member as a reference, the difference between the setting conditions of the above-mentioned members for the next product is calculated, and each member for changing the conditions is driven at the same time, and each moves to the setting condition position and stops. automatic packaging method. (2) Equipped with an adjusting member to be adjusted according to the dimensions of products such as film feeding members for packaging products with different dimensions, a drive mechanism thereof, and an operating circuit, and the operating circuit stores the setting conditions of the adjusting member for each product. and a storage yard for the current setting conditions of the above-mentioned members at the end of the packaging work, and an arithmetic circuit that calculates the difference in the new product setting conditions based on the above-mentioned current setting conditions by inputting a new product number. An automatic packaging device characterized in that the drive mechanisms are simultaneously driven to shift the difference distances in respective required directions. (3) Claim 2 characterized in that the drive mechanism is equipped with a pulse transmitter such as an encoder that emits a pulse signal in proportion to the distance traveled, and the operating circuit integrates the pulse signals to calculate the amount of travel and compares it with the difference distance. Automatic packaging equipment as described. (4) The automatic packaging apparatus according to claim 2, wherein each drive mechanism is driven by a pulse current generated by a pulse generator, and the operating circuit integrates the number of pulses to calculate the amount of movement of the adjustment member. (5) The automatic packaging apparatus according to claim (2), (3) or (4), wherein the operating circuit includes means for selecting the magnitude of the amount of transfer of each adjustment member and rearranging the size order of the amount of transfer. (6) The operating circuit is equipped with means for determining the forward/reverse rotation of the drive mechanism based on the difference between the current condition of the adjustment member at the end of the work and the set condition for the input product number, and selects the forward/reverse switch for the drive mechanism operating motor. Operating claims (2) (3)
) or the automatic packaging device described in (4). (7) When the ratio between the amount of movement of the adjustment member and the amount of integrated pulses of the drive mechanism is non-linear, the operating circuit calculates the recent value by dividing both into multiple parts and linearizing the divided sections. The automatic packaging device according to claim 2, 3, or 4, comprising an arithmetic circuit. (8) Claim (2), wherein the operating circuit is provided with means for correcting backlash by moving the adjustment member further backward from the set condition position when moving the adjustment member in the reverse direction, and then moving forward to the position.
(3) The automatic packaging device described in (4) or (6).