JP2012206790A - Film braking device for packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film roll braking device for a packaging machine which has a simple configuration, is low in manufacturing cost, excellent in maintenability, and can control braking pressure corresponding to the winding diameter of the film roll.SOLUTION: A controller 30 which has received a pulse signal 23 from a winding diameter measuring device 20 calculates the winding diameter of the film roll Fr, then, transmits an air pressure instruction signal 18 proportional to the winding diameter to an electropneumatic regulator 16, and then, the electropneumatic regulator 16 supplies air pressure based on the instruction to an air cylinder 14, accordingly, the air cylinder 14 changes a force of pulling a leather belt 11, then, a braking force for the winding shaft is always maintained at an optimum value corresponding to the winding diameter of the film roll Fr.

Description

  The present invention relates to a film braking device in a packaging machine.

  The belt-shaped packaging material Fw is formed into a cylindrical shape by a cylinder making machine to form a cylindrical packaging material Ft, a center seal is applied to the overlapping portion, the packaged product is supplied into the cylindrical packaging material, and before and after the packaged product P. By applying end sealing and cutting, the bag making and filling machine for manufacturing the bag packaging body Bp containing the packaged product inside, or the band-shaped packaging material Fw is cut to a certain size and the periphery of the packaged product P In the overwrapping machine that manufactures the overwrapping body Wp so as to wrap the wrapping material, the belt-shaped packaging material Fw to be used is wound and supplied as a packaging material roll Fr in a roll state. The packaging machine uses the packaging material roll Fr mounted on a take-up shaft, and draws the belt-shaped packaging material Fw from the film roll Fr by a paper feed mechanism.

  The bag making filling and packaging machine includes a continuous operation type in which the conveyance of the packaging material Fw is continuously stopped and an intermittent operation type in which the packaging material is conveyed for each bag. In addition, the overwrapping machine is an intermittent operation type in which a packaging material used for each packaged product is cut.

  In the case of a continuous operation type bag making and filling and packaging machine, if the belt-like packaging material Fw is continuously pulled out, the film roll Fr rotates following the withdrawal of the belt-like packaging material Fw, so that a constant inertia force is obtained. Has occurred. And if a difference arises between the rotational speed accompanying the inertial force, and the drawing-out speed of the film roll Fr, there exists a possibility that slack may arise in the strip | belt-shaped packaging material Fw. If the belt-like packaging material Fw is loosened in this way, for example, when the bag is made by passing through the cylindrical device of the packaging device, the belt-like packaging material Fw snakes to form a center seal portion at a desired location. As a result, the final package may become defective.

In the case of an intermittent operation type bag making and filling packaging machine or overwrapping packaging machine, the film roll Fr rotates by inertia due to inertia when the paper feeding device pulls out and stops the belt-like packaging material Fw having a certain size. There is a possibility that slack may occur in the strip-shaped packaging material Fw.
Therefore, the film roll Fr is provided with a braking device that brakes this rotation, and the rotation of the packaging material roll Fr is applied to apply tension to the belt-shaped packaging material Fw to prevent the occurrence of the slack. .

  The simplest type of braking device of this type is one in which a leather belt is wound around a take-up shaft on which a film roll Fr is mounted. One end is fixed and the other end is fixed via a spring. (For example, refer to the related art in the left column of page 2 of Patent Document 1 and FIG. 5). By this method, an approximate solution can be achieved, the structure is simple, and the maintainability is good. However, in this method, as the roll diameter of the packaging material roll Fr gradually decreases with the consumption of the packaging material and the weight of the packaging material decreases, the inertia in the rotation direction of the film roll Fr also decreases. Along with this, the braking force of the band against the shaft increases. As a result, there is a drawback that the film is stretched by the tension acting on the film, or the supply of the film is delayed.

  As a solution to this problem, Patent Document 1, Patent Document 2, Patent Document 3 and the like have proposed proposals for measuring the winding diameter of the film roll Fr and applying a braking force according to the winding diameter.

In the method disclosed in Patent Document 1, a torque motor that rotates in the direction opposite to the direction in which the film roll Fr rotates following the withdrawal of the belt-shaped packaging material Fw is mounted on the winding shaft on which the film roll Fr is mounted. At the same time, when a voltage generator that generates a voltage proportional to the speed of the winding shaft is installed, and the voltage generator and torque motor are electrically connected via a resistance converter, the speed of the winding shaft increases. The resistance converter controls the electric resistance so that the output torque of the torque motor is reduced (from page 27, left column, line 27 to page 2, right column, line 3 of Patent Document 1). See
The method disclosed in Patent Document 2 performs brake adjustment of a friction brake device using a motor provided on a winding shaft as a drive source in accordance with the winding diameter of the film roll Fr. Based on the input data instructing the type of packaging material to be used, data is stored so that the required maximum braking force for the maximum diameter of the film roll Fr and the required minimum braking force for the minimum diameter are stored, and the maximum braking force is stored. The brake force between the minimum brake force and the minimum brake force is calculated by calculating the winding diameter of the film roll Fr and controlling the motor of the friction brake device so that the braking force is proportional to the diameter (Patent Document 2). (See paragraph 5).

  The method disclosed in Patent Document 3 is obtained by a tension sensor that measures the tension of the belt-shaped packaging material Fw by providing a winding mechanism including an electromagnetic powder brake or a hysteresis brake on the winding shaft on which the film roll Fr is mounted. The braking force is controlled so that the tension is constant (see paragraphs 6 to 7 of Patent Document 3).

  Although some degree of solution can be obtained by these braking force control methods, each method has a problem that the mechanism is complicated and the cost is increased. The braking means is basically a consumable part and must be replaced after a certain period of time. However, the replacement of these brake devices is large and not easy to maintain.

Japanese Patent Publication No. 7-76017 JP-A-5-213319 JP-A-8-198206

  There is a need for a film roll braking device for a packaging machine that has a simple configuration, low manufacturing cost, good maintainability, and can control the brake pressure according to the roll diameter of the film roll.

The invention of claim 1 is a packaging machine that draws a strip-shaped packaging material from a film roll and is used for packaging a packaged product.
A brake mechanism with variable braking pressure on the take-up shaft on which the film roll is mounted;
A roll diameter measuring device for the film roll, and a control device for controlling the braking pressure of the brake mechanism according to the roll diameter of the film roll obtained by the roll diameter measuring device,
The brake mechanism with variable braking pressure includes a leather belt wound around the winding shaft;
An air cylinder that pulls the leather belt;
An electropneumatic regulator that varies the air pressure supplied to the air cylinder according to a command from the control device;
A film braking device in a packaging machine, wherein the film roll winding diameter measuring device comprises a disk having a radial cutout and fixed to the winding shaft and a sensor for detecting the cutout. is there.

  According to the invention of claim 1, by adding a winding diameter measuring device, an air cylinder, and an electropneumatic regulator, the optimum brake pressure corresponding to the winding diameter of the film roll can be controlled even with a simple configuration using a leather belt. Can be able to.

The invention of claim 2 relates to the invention of claim 1, wherein the control device controls the brake mechanism of variable braking pressure to the maximum brake pressure when the winding diameter of the film roll is maximum,
When the roll diameter of the film roll is minimum, the brake pressure is controlled to the minimum, and at the intermediate portion, the brake pressure is controlled in proportion to the roll diameter measured by the roll diameter measuring device of the film roll. It is the film braking device in the packaging machine.

  According to the second aspect of the present invention, the control device has a maximum brake pressure when the roll diameter of the film roll having the largest inertial force is maximum, and a minimum when the roll diameter of the film roll having the smallest inertial force is minimum. In the middle part, the state of the roll diameter of the film roll is controlled by controlling the brake pressure in proportion to the roll diameter measured by the roll diameter measuring device of the film roll. However, control can be performed to maintain the optimum brake pressure.

  A third aspect of the present invention relates to the first aspect of the present invention, wherein the control device temporarily varies the brake pressure variable brake mechanism to a minimum brake pressure at the start of conveyance of the belt-shaped packaging material. Then, the film braking device in the packaging machine is characterized by performing control to return to the brake pressure proportional to the winding diameter.

  According to the invention of claim 3, the control device performs control to temporarily change the brake pressure to the minimum brake pressure at the start of conveyance of the belt-shaped packaging material, and then return to the brake pressure proportional to the winding diameter. It can cope with the stop inertia at the start of the conveyance of the packaging material.

  A fourth aspect of the invention relates to the first aspect of the invention, wherein the control device temporarily changes the braking mechanism of the variable braking pressure type to a maximum braking pressure when the conveyance of the belt-shaped packaging material is stopped. Then, the film braking device in the packaging machine is characterized by performing control to return to the brake pressure proportional to the winding diameter.

  According to the invention of claim 4, the control device performs control to temporarily change the brake pressure to the maximum brake pressure when the conveyance of the belt-shaped packaging material is stopped, and then return to the brake pressure proportional to the winding diameter. It can cope with the rotation inertia when the packaging material is stopped.

  The invention of claim 5 relates to the invention of claim 1, wherein the control device changes the brake pressure proportional to the winding diameter at the start of conveyance of the belt-shaped packaging material to a minimum brake pressure after a lapse of a certain time, A film braking device in a packaging machine that performs control to return to a brake pressure proportional to a winding diameter again at the start of conveyance of the belt-shaped packaging material.

  According to the invention of claim 5, the control device changes the brake pressure proportional to the winding diameter at the start of conveyance of the belt-shaped packaging material to the minimum brake pressure after a lapse of a predetermined time, and again when the belt-shaped packaging material begins to be conveyed. Since it is possible to control to return to the brake pressure proportional to the winding diameter, if there is a margin in the packaging conditions such as the machine rotation speed and bag length, and the influence of the rotational inertia of the film roll during transport of the strip-shaped packaging material is small, By executing the control, the wear of the brake mechanism can be minimized.

  The invention of claim 6 relates to the inventions of claims 1 to 5, wherein the maximum value of the roll diameter of the film roll, the maximum brake pressure when the roll diameter of the film roll is maximum, and the film roll A film braking device in a packaging machine, wherein a minimum brake pressure can be set in a control device for each product by an operation unit when the winding diameter of the film is minimum.

  According to the invention of claim 6, the maximum diameter of the film roll to be used, the maximum brake pressure at the maximum diameter of the film roll, and the minimum brake pressure at the minimum diameter of the film roll are supplied to the control device from the operation unit for each product item. Therefore, any type of packaging material can be used and can be used in combination.

  A seventh aspect of the present invention relates to the first aspect of the present invention, wherein the control device transports the belt-shaped packaging material by a predetermined amount on a test prior to the start of conveyance of the belt-shaped packaging material, while the film is in the meantime. The film braking device for a packaging machine according to claim 1, further comprising a winding diameter measuring mode for measuring and storing a winding diameter of the roll.

  According to the invention of claim 7, prior to the start of conveyance, the belt-shaped packaging material is conveyed on a test basis by a test amount, and a winding diameter measuring mode for measuring and storing the winding diameter of the film roll is provided. Therefore, conveyance of the belt-shaped packaging material can be started with an appropriate brake pressure.

  The invention of claim 8 relates to the invention of any one of claims 1 to 7, wherein the wrapping material drawn from the film roll by the wrapping machine is formed into a cylindrical wrapping material by a cylinder maker, The packaged product is supplied into the cylinder, a center seal is applied to the overlapping portion of the cylinder, the end seals are applied to the front and rear positions of the packaged product of the cylindrical packaging material, and then cut to incorporate the packaged product. It can be a horizontal type or vertical type bag making filling and packaging machine for manufacturing a bag packaging body.

  The invention of claim 9 relates to the invention of any one of claims 1 to 7, wherein the packaging machine cuts the strip-shaped packaging material drawn out of the film roll into a certain size, and then the packaged product. It can be considered as an overwrapping machine that manufactures an overwrapping package so as to wrap around the product.

  In the film braking device of the packaging machine of the present invention, the braking mechanism is a mechanism using a leather belt, so that the structure is simple, the manufacturing cost is low, and the maintainability is good. The brake control is low in cost because no motor or the like is used, but the brake pressure can be controlled in accordance with the roll diameter of the film roll as in the case of using a motor or the like.

It is the schematic of the horizontal type bag making filling packaging machine with which this invention is applied. It is a perspective view of the appearance of a braking device and a winding diameter measuring device. It is a figure explaining the relationship between a braking device, a winding diameter measuring device, and a control device. It is a figure explaining operation | movement of an electropneumatic regulator. It is a figure of the setting screen of the film roll braking device of an operation part (touch panel display). It is a figure explaining the setting of the braking pressure for every product item.

  An embodiment of the horizontal bag making filling and packaging machine of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a horizontal bag making and filling machine to which the present invention is applied. The strip-shaped packaging material Fw drawn out from the film roll Fr mounted on the winding shaft 1 is conveyed downstream by the paper feed roller 2, is curved by the cylinder-making machine 3, is polymerized at the longitudinal edge, and is tubular-wrapped. A material Ft is formed. The tubular packaging material Ft is rotated by a paper drawing roller 4 composed of a pair of rolls in which the packaged product P is conveyed into the cylinder by a supply conveyor (not shown) and sandwiches the overlapping portion of the tubular packaging material Ft. Is further conveyed downstream. The center seal device 5 downstream of the paper drawing roller 4 performs center seal on the overlapping surface of the cylindrical packaging material Ft. After that, the cylindrical packaging material Ft containing the packaged product P is subjected to end sealing and cutting before and after the packaged product P inside the cylindrical packaging material Ft is sandwiched by the end seal device 6, thereby To manufacture. The end seal device incorporates a cutter (not shown) and cuts it.

  The winding shaft 1 is attached to a body frame (not shown) in a cantilever manner, is rotatable, and rotates following the movement of the strip-shaped packaging material Fw being pulled out. A brake device 10 and a winding diameter measuring device 20 are attached to the end of the winding shaft 1 on the main body frame side. The braking device 10 brakes the inertial force generated by rotating following the withdrawal of the strip-shaped packaging material Fw, applies a constant tension to the strip-shaped packaging material Fw, and loosens or excessively stretches the strip-shaped packaging material Fw. Is prevented from occurring. The winding diameter measuring device 20 is a device that measures the diameter of the film roll Fw from the amount of rotation of the winding shaft.

Configurations of the braking device 10 and the winding diameter measuring device 20 will be described with reference to FIGS. 2 and 3. The braking device 10 is provided at the end of the take-up shaft 1 on the main body frame side, the leather belt 11 wound around the take-up shaft 1, and a leather belt fixing that fixes one end of the leather belt 11 to the main body frame. Part 12, connecting part 13 for connecting the other end of leather belt 11 to air cylinder 14, air cylinder 14 for pulling leather belt 11, variable air supply pipe which is an air pipe connecting air cylinder 14 and electropneumatic regulator 16 15, an electropneumatic regulator 16 that supplies air of pressure based on the air pressure command signal 18 from the control device 30 to the air cylinder 14, a command signal line 19 that transmits the air pressure command signal to the electropneumatic regulator 16, and the electropneumatic regulator 16 An air supply pipe 17 for supplying constant pressure air from an air source, a control device 30 for controlling the entire machine including the braking device 10, and an operation unit 32 of the control device 30 It is.
The winding diameter measuring device 20 detects the notch of the detection plate 21 and the detection plate 21 which are provided at the end of the winding shaft 1 on the main body frame side and are provided with radial notches on the periphery, The sensor 22 is configured to transmit the pulse signal 23 to the control device 30, and the pulse signal line 24 is configured to transmit the pulse signal 23 to the control device 30. In this embodiment, the sensor 22 uses an optical sensor, but may be a magnetic sensor.

  Next, operations of the braking device 10, the winding diameter measuring device 20, and the control device 30 will be described with reference to FIG. In the film braking device of the packaging machine according to the present invention, the control device 30 that has received the pulse signal 23 from the winding diameter measuring device 20 calculates the winding diameter of the film roll Fr, and outputs an air pressure command signal 18 proportional to the winding diameter. By sending the air pressure to the air cylinder 14 by the electro-pneumatic regulator 16 to the air regulator 16, the force with which the air cylinder 14 pulls the leather belt 11 changes, and the braking force against the take-up shaft becomes the film roll. An appropriate value corresponding to the winding diameter of Fr is always maintained. How to explain each detail.

First, regarding the measurement of the winding diameter of the film roll Fr, since the detection plate 21 is coaxially attached to the end of the winding shaft 1, the film roll Fr rotates following the withdrawal of the strip-shaped packaging material Fw. Then, since the winding shaft 1 also rotates, the detection plate 21 also rotates. As a result, the sensor 22 alternately detects the notched portion and the portion that is not so, and the pulse signal 23 is obtained. The control device 30 calculates the winding diameter of the film roll Fr from this pulse signal. Since the number of notches provided in the detection plate 21 is known, the number of pulses obtained when the winding shaft 1 makes one revolution is also known. If this pulse is counted while the belt-like packaging material Fw having a length corresponding to the bag is sent, the winding diameter of the film roll Fr can be obtained. That is, if the number of pulses obtained while feeding the belt-shaped packaging material Fw of the length of one bag and the number of pulses obtained when the winding shaft 1 makes one rotation, how many turns the winding shaft 1 is obtained, The circumference of the film roll can be obtained from the numerical value and the length of the integral bag, and the diameter of the film roll can be calculated from the circumference. If the roll diameter of the film roll Fr is small, the circumference is also short, so many pulses are counted while the belt-shaped packaging material Fw of the length of one bag is sent, and if the roll diameter of the film roll Fr is large, Since the circumference is also long, the fact that a small number of pulses are counted while the belt-shaped packaging material Fw having the length of one bag is sent is used.
It is also possible to detect the film end of the film roll using the pulse signal 23 from the winding diameter measuring device 20.

  Next, regarding the electropneumatic regulator 16 that receives the air pressure command signal 18 from the control device 30 and varies the air pressure supplied to the air cylinder 14, the electropneumatic regulator 16 responds to the command signal as described above. It is a device that supplies air with a high pressure. As shown in FIG. 4, the electropneumatic regulator 16 used in this embodiment is of a type that varies the output air pressure 45 based on the 0V-5V command voltage 40. As a default setting, the minimum command voltage 42 is the minimum when the command voltage 42 is 0V. If the air pressure 43 (for example, 0.1 megapascal) and the maximum air pressure 44 (for example, 0.5 megapascal) when the maximum voltage command 41 is 5V are set, 0.1 MPa for a command signal of 0V, When the command signal is 5V, the air pressure of 0.5MPa is output, and when the command is between 0V and 5V, it is proportional to the command on the straight line connecting the coordinates of 0V / 0.1MPa and 5V / 0.5MPa. Air pressure is output.

  Next, the control device 30 includes a voltage output that can change 0V-5V in units of 0.1V in 50 steps as the air pressure command signal 18. In addition, for each product to be manufactured, the setting value 51 of the braking force at the maximum film roll diameter, the setting value 52 of the braking force at the minimum film roll diameter, and the setting value 50 of the maximum diameter of the film roll to be used can be set and stored. It is configured. This is because the maximum roll diameter and film width of the film roll used for each product may be different, and the packaging conditions such as the machine rotation speed and bag length per bag are also different, so the optimum braking pressure is applied. Because it is necessary to add. These set values are set by the operation unit 32 connected to the control device 30 as shown in FIG. 3, and the control device stores each product item. In this embodiment, 0V-5V of the air pressure command signal 18 has a resolution of 50 steps in units of 0.1V. However, the resolution can be lowered and approximate control can be performed. It can also be controlled.

  The operation unit of the present embodiment is a touch panel display. FIG. 5 shows a screen of the operation unit of this embodiment. The setting value 50 of the maximum diameter of the film roll sets the maximum winding diameter, that is, the winding diameter of the film roll in a new state that is not used. This is because the minimum winding diameter, that is, the diameter of the paper tube is standardized and fixed at 90 mm, but the maximum winding diameter may change depending on the user's specification. In the present invention, the braking pressure, that is, the air pressure command signal 18 output from the control unit changes in accordance with the winding diameter. Therefore, if the maximum winding diameter changes, the unit voltage (0. The unit of the reduction amount of the winding diameter with respect to 1V) is different. For example, if the setting value 50 of the maximum diameter of the film roll is 400 mm, the minimum winding is 90 mm, so the amount of change in the winding diameter is 310 mm. When this is divided into 50 stages, 0.1 V is obtained every 6.2 mm. Will change the voltage. In addition, if the setting value 50 of the maximum diameter of the film roll is 800 mm, the minimum winding is 90 mm, so the amount of change in the winding diameter is 710 mm. When this is divided into 50 stages, 0.1 V is obtained every 14.2 mm. Will change the voltage.

  Next, the setting value 51 of the braking force when the film roll diameter is maximum and the setting value 52 of the braking force when the film roll diameter is minimum are set. It is provided because it depends on whether a certain level of braking pressure is required. As described above, the inertial force generated by the rotation of the film roll Fr following the withdrawal of the strip-shaped packaging material Fw differs depending on the packaging conditions such as the film width, the machine rotation speed, and the bag length per bag. It is. For example, when there is a product item 01 using a wide film and a product item 02 using a narrow film, the product item 01 using a wide film is wide and has a large weight, so that the inertial force is also large. It is necessary to increase the braking force greatly, and the product item 02 using a film having a narrow width needs to have a lower braking force than the product item 01. In this case, as shown in FIG. 6, in the case of the product item 01 that needs to increase the braking force, the maximum braking force 60 of the product item 01 is set to the maximum command voltage 5V = air pressure 0.5 MPa, and the product item 01 In the case of the product item 02 in which the minimum brake force 61 is set to the command voltage 1V = 0.18 MPa and the brake force needs to be weaker than the product item 01, the maximum brake force 62 of the product item 02 is set to the maximum command voltage. If 4V = air pressure is set to 0.42 MPa and the minimum braking force 63 of the product item 02 is set to the command voltage 0.5V = 0.14 MPa, an appropriate braking force can be obtained.

  The film roll diameter measurement value monitor 53 displays the current winding diameter measured by the control device. The film roll measurement value reset button 54 is a button for returning the measurement value of the winding diameter to the initial state. The initial state refers to a state in which the control device 30 cannot grasp the winding diameter. For example, immediately after turning on the machine, when the film is finished, when the film roll is replaced, or when the product item is switched, the film roll Fr mounted at that time is a new film roll that is not in use. Since the controller 30 cannot grasp whether the film roll is used or not when the conveyance of the belt-shaped packaging material Fw is started and the winding diameter measurement is not performed, in such a state, the setting of the braking force at the maximum film roll diameter is performed. An intermediate air pressure command signal 18 between the value 51 and the brake force setting value 52 when the film roll diameter is minimum is temporarily set, and when the winding diameter measurement is performed, a process of changing to an appropriate air pressure command signal 18 is performed. A film roll measurement value reset button 54 is provided in case the controller 30 cannot grasp that the film roll Fr has been replaced. In this embodiment, a button is provided on the touch panel display of the operation unit 32, but a switch may be provided separately.

  In the present embodiment, in an initial state where the control device 30 cannot grasp the winding diameter, an air pressure command intermediate between the braking force setting value 51 when the film roll diameter is maximum and the braking force setting value 52 when the film roll diameter is minimum. Although the signal 18 is set temporarily, a winding diameter measurement mode for measuring a winding diameter of the film roll Fr while carrying a certain amount of packaging material as a test is provided, and winding is performed automatically or manually before normal operation. It can also be configured to perform diameter measurement.

  In the horizontal bag making filling and packaging machine of the present embodiment, control is performed to change the braking pressure from an appropriate value according to the winding diameter at the start and stop of transport of the belt-shaped packaging material Fw. This is to reduce the braking pressure to prevent excessive elongation at the start of conveyance of the belt-shaped packaging material Fw, and to prevent excessive elongation. At the time of stopping conveyance of the belt-shaped packaging material Fw, to reduce the braking pressure This is to prevent excessive sagging. Further, the variable function of the braking pressure at the start and stop of conveyance of the belt-shaped packaging material Fw can be set to “use / do not use” for each product item. Furthermore, it is possible to set the value of the braking pressure at that time for each product item.

  Furthermore, when there is a margin in the packaging conditions such as the machine rotation speed and bag length and the influence of the rotational inertia of the film roll during the transport of the strip-shaped packaging material is small, the brake pressure proportional to the winding diameter at the start of the transport of the strip-shaped packaging material Fw When the rotational inertia of the film roll Fr becomes stable after a lapse of a certain time, the brake pressure is changed to the minimum brake pressure, and at the start of conveyance of the belt-shaped packaging material, the brake pressure is again returned to the brake pressure proportional to the winding diameter, and the control corresponding to the stop inertia is performed. Can also

  As mentioned above, although the Example to the horizontal type bag making filling machine of the film braking device in the packaging machine which is this invention was described, it cannot be overemphasized that this invention is applicable also to a vertical type bag making filling packaging machine and an overwrapping packaging machine.

DESCRIPTION OF SYMBOLS 1 Winding shaft 2 Paper feed roller 3 Tube making machine 4 Paper drawing roller 5 Center seal device 6 End seal device 10 Braking device 11 Leather belt 12 Leather belt fixing | fixed part 13 Connection part 14 Air cylinder 15 Variable pressure air supply pipe 16 Electropneumatic regulator Reference Signs List 17 Air supply pipe 18 Air pressure command signal 19 Command signal line 20 Winding diameter measuring device 21 Detection plate 22 Sensor 23 Pulse signal 24 Pulse signal line 30 Control device 31 Packaging material conveyance state signal 32 Operation unit 40 Command voltage 41 Maximum command voltage 42 Minimum command voltage 43 Minimum air pressure 44 Maximum air pressure 45 Output air pressure 50 Setting value of maximum film roll diameter 51 Setting value of braking force when film roll diameter is maximum 52 Setting value of braking force when film roll diameter is minimum 53 Monitor of film roll diameter measurement 54 Reset button of film roll measurement Tan 60 Maximum braking force 61 of product item 01 Minimum braking force 62 of product item 01 Maximum braking force 63 of product item 02 Minimum braking force of product item 02

Claims (9)

In a packaging machine that draws a strip of packaging material from a film roll and uses it to wrap packaged products,
A brake mechanism with variable braking pressure on the take-up shaft on which the film roll is mounted;
A roll diameter measuring device for the film roll, and a control device for controlling the braking pressure of the brake mechanism according to the roll diameter of the film roll obtained by the roll diameter measuring device,
The brake mechanism with variable braking pressure includes a leather belt wound around the winding shaft;
An air cylinder that pulls the leather belt;
An electropneumatic regulator that varies the air pressure supplied to the air cylinder according to a command from the control device;
A film braking device in a packaging machine, wherein the film roll winding diameter measuring device comprises a disk having a radial cutout and fixed to the winding shaft and a sensor for detecting the cutout. The control device is
When the roll diameter of the film roll is maximum, the brake mechanism with variable brake pressure is controlled to the maximum brake pressure,
When the roll diameter of the film roll is minimum, control to the minimum brake pressure,
The film braking device in a packaging machine according to claim 1, wherein the intermediate portion is controlled to have a brake pressure proportional to the winding diameter measured by the winding diameter measuring device of the film roll.   The control device performs control to temporarily change the brake mechanism of the variable braking pressure type to the minimum brake pressure at the start of conveyance of the belt-shaped packaging material, and then return to the brake pressure proportional to the winding diameter. The film braking device in the packaging machine according to claim 1, wherein   When the transport of the belt-shaped packaging material is stopped, the control device temporarily changes the brake pressure variable brake mechanism to the maximum brake pressure, and then performs control to return to the brake pressure proportional to the winding diameter. The film braking device in the packaging machine according to claim 1, wherein   The control device changes the brake pressure proportional to the winding diameter at the start of conveyance of the belt-shaped packaging material to a minimum brake pressure after a lapse of a certain time, and again sets the brake pressure proportional to the winding diameter at the start of conveyance of the belt-shaped packaging material. The film braking device for a packaging machine according to claim 1, wherein a return control is performed.   The maximum value of the roll diameter of the film roll, the maximum brake pressure when the roll diameter of the film roll is maximum, and the minimum brake pressure when the roll diameter of the film roll is minimum. The film braking device for a packaging machine according to any one of claims 1 to 5, wherein the film braking device can be set for each of the packaging machines.   Prior to the start of transporting the belt-shaped packaging material, the control device transports the belt-shaped packaging material by a fixed amount on a test basis, and includes a winding diameter measurement mode for measuring and storing the winding diameter of the film roll during that time. The film braking device in a packaging machine according to any one of claims 1 to 5, wherein   The wrapping machine drawn from the film roll by the wrapping machine is formed into a cylindrical wrapping material by a cylinder maker, the packaged product is supplied into the cylinder, a center seal is applied to the overlapping portion of the cylinder, and the cylindrical packaging is provided. The bag making and filling and packaging machine for producing a bag packaging body in which the packaged product is built by cutting the material after end sealing is applied to the front and back positions of the packaged product. Item 8. The film braking device in the packaging machine according to Item 7. The packaging machine according to claim 1, wherein the packaging machine is an overwrapping machine that manufactures an overwrapping body by cutting a strip-shaped packaging material drawn from the film roll into a certain size and wrapping around the packaged product. The film braking device in the packaging machine in any one of Claims 1-7.

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