JPH04132010U - Pinch detection mechanism of heat sealing machine for packing equipment - Google Patents

Abstract

(57) [Summary] [Purpose] Detects whether a foreign object such as an object to be packed or a finger is caught during sealing operation. This also prevents machine breakdowns and injuries. [Structure] An upper pressing plate 13 is provided which interlocks the pack film 6 above the sealing part in conjunction with the pressure bonding of the seal bar 9 and the pressing bar 10. A pressure detection tape switch 14 is attached to the tip contact surfaces of the upper press plates 13 to detect the pressure when a foreign object is sandwiched between the tip contact surfaces of the pair of upper press plates 13. When a foreign object is caught, the pressure generated by the foreign object is detected by the pressure detection tape switch 14.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be used in a device that continuously packs waste such as garbage or products. This relates to a heat sealing machine.

0002

[Conventional technology]

Generally, this type of device uses a tube-shaped pack film as shown in Figure 5. There is a continuous packing device that uses This device inputs the items to be packed from the input port. It enters the pack film whose lower opening is fused and closed, and after being put in, it is transported by a feed roll. After feeding a certain amount of packaging film, it is processed by a heat sealing machine. This is a device that fuses and fuses. The heat sealing machine of this device uses an electric heater. It consists of a seal bar for fusion and a presser bar for pressing the seal. A pack film is sandwiched between them, and two bars are pressed together to fuse and cut. .

0003

[Problem that the idea aims to solve]

However, if the object to be packed is caught between the two bars during the seal crimping operation, , leading to damage to the heat sealing machine, and injury to fingers if fingers were caught. There was a problem with the This invention was made in view of the above problems, and the purpose of this invention is The machine can detect if a foreign object such as an object to be packed or a finger is caught during the seal operation. The heat sealing machine for pack equipment can prevent malfunction or injury. The purpose is to provide a detection mechanism.

0004

[Means to solve the problem]

In order to achieve the above purpose, the pinch detection mechanism of the heat sealing machine for the pack device of this invention is In conjunction with the crimping of the seal bar 9 and presser bar 10, the pack filler is attached above the sealing part. between the tip contact surfaces of the pair of upper press plates 13. Press the upper side of the pressure detection tape switch 14 that detects pressure when a foreign object is caught between the It was attached to the tip contact surface of the plate 13. In other words, if a foreign object becomes trapped, The pressure generated by the pinching is detected by the pressure detection tape switch 14, and the presence of foreign objects is detected. control circuit 20 to stop and reverse the seal crimping operation. It has become so.

[0005]

[Effect]

Move the seal bar 9 and presser bar 10 close to each other and press the seal. If an object to be packed or a finger or the like is caught between the seal bar 9 and the presser bar 10, A pressure detection switch 14 detects the pressure applied between the upper holding plate 13 and the upper holding plate 13 . this Upon detection, the sealing operation can be stopped and reversed by the operation control circuit 20, and the heat sealing It works to prevent damage to the machine and ensure safety.

[0006]

【Example】

The pack device holds a tubular pack film 6 as shown in FIG. The holder 1, the feeder 2 that feeds the pack film 6, and the pack film 6 are A heat sealing machine 3 that seals sheets and a stock section 4 that stocks packed bags. It consists of The pack film 6 is folded into cassettes, and there are dozens of them. It has a length of m. The pack film 6 is inserted into the inside of the holder 1 through the upper end. It is threaded downward. In addition, the bag lower opening 8 of the pack film 6 is fused and closed. Since it is closed, a pack bag body 7 is formed inside the pack film 6. Upward When an object to be packed is inputted from the input port 5 located in the bag, it enters the pack bag body 7. next Both side edges of the pack film 4 are sandwiched between the feed rolls 2a of the feeder 2 located below this. Then, rotate the feed roll 2a to feed the pack film 6 downward. At the same time as this Objects to be packed are also sent downward. This feed amount should be adjusted according to the size of the item to be packed. It's a reasonable length. After this, the heat sealing machine 3 located below the feeder 2 seals. By crimping the bar 9 and the presser bar 10, the middle of the pack film 6 is Perform sealing and fusing. At this time, a shape is formed inside the holder 1 along with the upper opening of the pack bag. The lower opening 8 of the completed pack body 7 is also fused and closed at the same time, so it is difficult to insert the next pack item. becomes possible. Also, since it is fused during heat sealing, the packed bag will fall under its own weight. It falls towards the direction and is stored in the stock part 4 at any time. This device operates as described above. It is something. In this invention, heat sealing machine 3 is devised in a series of functional operations to remove foreign particles. A pinch detection mechanism has been added.

[0007] The heat sealing machine 3 mainly uses a sealing bar 9 and a presser bar as shown in FIGS. 1 and 2. 10, each connected by two slide shafts 11, on which the reciprocating movement The seal is opened and closed by opening and closing the seal. Seal bar 9 is heated with an electric heater inside. It is supposed to be done. The operating means of the seal bar 9 and the presser bar 10 is, for example, a wire. A screw-rotation slide type with a screw mechanism using a puller or a slide shaft. Either one is fine. The seal bar 9 and the presser bar 10 are fixed to a bar mount 22, Further, the bar mount 22 is fixed to a slide block 23. Two slide sheets The shaft 11 is inserted into the slide block 23 as shown in FIG. The seal can be operated opening and closing. As shown in FIG. Two guide holes 24 are bored with a certain span. In this guide hole 24 The slide pins 25 are slidably inserted through the respective slide pins 25, and are arranged in front of the slide pins 25. A lower film holder 12 is connected to a slide pin 25. Bar mount 22 A compression spring 26 is interposed between the lower film holder 12 and the pressure spring 26. The spring force of the mounting spring 26 provides pressure holding force for the lower film holder 12. Ru. Attach the base of the upper holding plate 13 to the rear of the slide pin 25 using the fixing ring 27. The film holder 12 is fixed thereto and is integrated with the film holder 12 on the lower side of the seal portion. upper side The holding plate 13 has an L-shaped angle shape, and the tips of the pair of upper holding plates 13 are are facing each other. When the seal bar 9 and the presser bar 10 are crimped, the upper The tip of the side presser plate 13 and the lower film presser 12 are pressed against each other. . Figure 2(b) is a diagram showing the operating state of the film presser when the seal part is crimped. be. Below the seal, the pack film 6 is sandwiched between the lower film presser 12, Its own weight is held by the force of the compression spring 26. Also, the upper holding plate 13 The pack film 6 above the seal part is sandwiched between the tip contact surfaces and pressed against the seal bar 9. The tension between the bar 10 and the upper end of the holder 1 generated when closing is applied directly to the sealing part. The pack film 6 is held down so that it does not get caught.

[0008] The tip of the upper presser plate 13 on the presser bar 10 side among the pair of upper presser plates 13 A pressure detection tape switch 14 is attached along the entire length. This pressure test The known tape switch 14 is generally commercially available. This pressure sensing The way to install the pressure switch 14 is to provide a groove 13a at the tip and apply pressure to this groove 13a. It is attached by fitting the detection tape switch 14. Seal bar 9 Do not attach the pressure detection tape switch 14 to the tip of the upper holding plate 13 on the side. However, a pad 16 corresponding to the pressure detection tape switch 14 is provided. Figure 2 (a ) is a diagram of the operation of this function. If a foreign object hits the tip of the upper holding plate 13, the pressure detection tape switch 14 detects pressure, thereby detecting the presence of a foreign object. In addition, the pressure detection Since the loop switch 14 extends over the entire length, it can be detected at any position. Also The pressure detection tape switch 14 is connected to the operation control circuit 20 and receives a pinch detection signal. When No. A is input to the operation control circuit 20, the seal crimping operation is stopped and reversed. If there is no foreign object, the pressure will not be detected and the operation will proceed until seal crimping [Fig. 2 (b) )], when the seal is crimped, it inevitably hits the pad 16 on the opposite side and pressure is generated. The pressure detection tape switch 14 is activated. To prevent this, apply pressure just before seal crimping. A release switch 15 is installed to release the function of the force detection tape switch 14. . This release switch 15 may be a photo sensor or a limit switch. Cancellation When the detection release signal B is sent from the switch 15 to the operation control circuit 20, the pressure detection The detection of the tape switch 14 is released. The release position is a few mm directly from the seal crimp. Before. As a result, when pressure is generated by pinching a foreign object, it is reversed and heat-sealed. It has a function to hold the seal crimp when pressure is generated during crimping. Ru. FIG. 4 shows the operation timing of the release switch 15. Is the seal crimping operation started a? The detection range c is from point b to point b where the release switch 15 is activated. The range e from where the seal is crimped to the seal crimped d is a range e that is not detected, and this range e is several mm. be.

[0009]

[Effect of the idea]

As described above, this invention works in conjunction with the crimping of the seal bar and presser bar to It is equipped with an upper holding plate that sandwiches the pack film on both sides, and the tips of the pair of upper holding plates connect. Press the pressure detection tape switch upward to detect pressure when a foreign object is caught between the surfaces. Since it is attached to the contact surface at the tip of the sealing plate, it is recommended to bring the seal bar and presser bar close together. If the object to be packed or your fingers are caught between the upper holding plates when moving the It is possible to detect the presence of foreign objects by using a tape switch for It can easily detect the presence of foreign objects, and it also uses a tape switch for pressure detection. You can stop the seal crimping operation by electrically connecting it to the operation control circuit, or It is now possible to turn the machine upside down, preventing damage to the heat sealing machine when foreign objects are caught. It is possible to improve the safety at the same time.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a heat sealing machine according to an embodiment of the present invention.

FIG. 2 is a sectional view illustrating the operation of the same as above.

FIG. 3 is an explanatory diagram illustrating the same control as above.

FIG. 4 is an explanatory diagram illustrating the timing of operation of the release switch same as the above.

FIG. 5 is a schematic sectional view showing the entire pack device same as above.

[Explanation of symbols]

6 Pack film 9 Seal bar 10 Holding bar 13 Upper holding plate 14 Tape switch for pressure detection

Claims (1)

[Scope of utility model registration request] Claim 1: In a heat sealing machine for a pack device, which welds the pack film by sandwiching a tube-shaped pack film between a seal bar and a presser bar that can be freely moved close to and apart from each other, and also melts and cuts the pack film, the seal bar This pressure detection tape switch is equipped with an upper holding plate that sandwiches the pack film above the sealing part in conjunction with the crimping of the presser bar, and detects pressure when a foreign object is caught between the tip contact surfaces of the pair of upper holding plates. A pinch detection mechanism for a heat sealing machine for pack equipment, which is attached to the tip contact surface of the upper holding plate.