JPH04132012U - Pinch detection mechanism of heat sealing machine for packing equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to detect whether a foreign object such as an object to be packed or fingers is caught during sealing operation. [Structure] A swing detection plate 11 is attached to a seal bar 9 and a holding bar 10 so as to be swingable back and forth. A detection switch 15 is provided to sandwich a foreign object between a pair of swing detection plates 11 and detect when the swing detection plates 11 swing backward. If a foreign object is detected, the seal crimping operation is stopped and reversed.

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 6. 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 , a swing detection plate 11 is attached to the seal bar 9 and the presser bar 10 so as to be able to swing back and forth. , when a foreign object is sandwiched between a pair of swing detection plates 11 and the swing detection plates 11 swing backward. A detection switch 15 for detection is provided on one of the seal bar 9 and the pressing bar 10. Ta. In other words, when a foreign object is caught, the swing detection plate 11 swings and retreats, The detection switch 15 is turned on to detect the presence of a foreign object and communicate with the operation control circuit 20. If a foreign object is detected, the seal crimping operation is stopped and reversed. It has become so.

[0005]

[Effect]

When moving the seal bar 9 and presser bar 10 close together, the vibration is detected. If some object is caught between the tip contact surface of the plate 11, the swing detection plate 11 will move around the fulcrum. It swings and is pushed backwards. Therefore, the detection switch 15 installed at the rear is turned on. The detection function works by turning it on. Upon this detection, the operation control circuit 20 stops the seal operation. It has a function that prevents damage to the heat sealing machine and ensures safety. to read.

[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 part of the pack film 6 is Perform sealing and fusing. At this time, the inside of the holder 1 along with the upper opening of the pack body 7 Since the lower opening 8 of the pack body 7 formed in input becomes possible. Also, since it is fused during heat sealing, packed bags are It falls downward and is stored in the stock section 4 at any time. This device operates as described above. It is something to do. In this invention, the heat sealing machine 3 is improved in a series of functional operations, Added a foreign object detection mechanism.

[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 18, 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. A swing detection plate 1 is provided above the seal bar 9 and the presser bar 10. 1 has been installed. This swing detection plate 11 is located below the seal bar 9 and the presser bar 10. It also functions to sandwich and hold the pack film 6 together with the film presser 12 provided in the Sleep. The swing detection plate 11 is attached to fulcrums 13 on both sides of the seal bar 9 and the presser bar 10. It is attached and swings around this fulcrum 13. Seal part In the state where is open, the swing detection plate 11 is pulled by the spring 14. The position is fixed by a stopper 17. Tip contact surface of swing detection plate 11 The position of 11a needs to be adjusted so that it protrudes several mm in front of the seal crimping surface. The shape of the end contact surface 11a is rounded to prevent scratches when the pack film 6 is sandwiched. It is bent into a shape. Also, a detection switch is installed behind the swing detection plate 11 on the presser bar 10 side. 15 is attached. Preferably, this uses a photosensor. Next This operation is explained below. The swing detection plate 11 swings backward around the fulcrum 13. Therefore, if a foreign object is caught between the seal bar 9 and the presser bar 10, the tips may contact each other. They hit the surface 11a and are pushed backward. At this time, the swing detection plate 1 of the presser bar 10 The switching board 11b of No. 1 turns on the detection switch 15 to detect the presence of a foreign object. Ru. This state is shown in FIG. 3(a). Since the vibration detection plate 11 is located at the full length of the seal width, It can be detected in any position. Furthermore, the detection switch 15 is connected to the operation control circuit 20. When the pinch detection signal A is input to the operation control circuit 20, the seal crimping operation is started. Stop and reverse operations. If there is no foreign object, the detection switch 15 is turned on until the seal is crimped. Although it operates without turning on, [Fig. 3(b)], when the seal is crimped, the end contact inevitably occurs. Since the tactile surface 11a makes contact and is pressed, the detection switch 15 is turned on. prevent this To do this, a release switch 16 cancels the function of the detection switch 15 immediately before seal crimping. has been installed. This release switch 16 can also be a photo sensor or limit switch. But that's fine. A detection release signal B is sent from the release switch 16 to the operation control circuit 20. Then, the detection of the detection switch 15 is released. The position to release is a few mm from the seal crimping. Just before. FIG. 5 shows the operation timing of the release switch 16. Seal crimping operation The detection range c is from the start point a to the point b where the release switch 16 is activated, and the release switch 16 is activated to the seal crimping d is the range e in which detection is not made, and this range e is It is several mm.

[0008]

[Effect of the idea]

As described above, the present invention includes a swing detection plate that automatically swings back and forth between the seal bar and the presser bar. If a foreign object is caught between a pair of rocking detection plates and the rocking detection plates swing backwards, A detection switch is installed on one side of the seal bar or presser bar to detect When moving the seal bar and presser bar closer together, the vibration detection plate If any object is caught between the tip contact surface, the swing detection plate will swing around the fulcrum. The detection function is activated by being pushed backwards and turning on the detection switch. It is possible to detect foreign objects caught in the The seal crimping action can be stopped or reversed by making an electrical connection to the circuit. This makes it possible to prevent damage to the heat sealing machine when foreign objects get caught. This can improve safety.

[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 front view showing an enlarged main part of the same as the above.

FIG. 3 is a front view illustrating the operation same as the above.

FIG. 4 is an explanatory diagram illustrating the operation same as the above.

FIG. 5 is an explanatory diagram illustrating the timing of operation of the release switch same as the above.

FIG. 6 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 11 Oscillation detection plate 15 Detection switch

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 A swing detection plate is attached to the and presser bar so that it can swing back and forth,
Pinch detection in a heat sealing machine for pack equipment, which is equipped with a detection switch on one of the seal bar or presser bar to detect when a foreign object is sandwiched between a pair of swing detection plates and the swing detection plate swings backward. mechanism.