JPH0212809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to preventing sealer from being caught in packaging equipment.

BACKGROUND OF THE INVENTION Among conventional packaging devices, a three-sided seal packaging device will be explained based on FIG. It is sent to a bag forming device 6 via rollers 5. On the other hand, the object to be packaged 7 is transferred to the entrance conveyor 8.
It is pushed into the bag forming device 6 by the chain blade 9. The film 4 is moved in the direction of the arrow with the object to be packaged 7 contained in the film 4 formed into a bag by the bag forming device 6. The edges of the film 4 formed by the bag-forming device 6 are stretched, and the edges are vertically sealed 12 by a vertical sealer 11. Wrapping objects 7 are set at predetermined intervals in the vertically sealed film 4 by the lead conveyor 13.
is supplied to the end sealers 14 and 15 in a built-in state. The end sealers 14 and 15 have the function of horizontally sealing 16 the vertically sealed film 4 and cutting it with cutters 17 and 18. The upper end sealer 14 rotates clockwise around a sealer shaft 20 and has a sealer 21 and a cutter 17. The lower end sealer 15 is rotated counterclockwise by a sealer shaft 22 in synchronization with the upper sealer shaft 20, has a sealer 23 and a cutter 18, and has a cushion piece 24 wound around the sealer shaft 22. This cushion piece 24 is for reliably passing the packaged object 7 conveyed by the lead conveyor 13 to the next exit conveyor 25. Horizontal seal 16 by end sealers 14 and 15
The cut packaged products 26 are transferred to an exit conveyor 25.
transported by. The object to be packaged 7 is conveyed while being pushed by the chain blade 9 of the entrance conveyor 8, and is pushed into the bag forming machine 6, but when the object to be packaged 7 is supplied to the entrance conveyor 8, it may be set in an abnormal state, or Or, if the object to be packaged is bread, the relative position of the film 4 formed into a bag by the bag-forming device 6 and the object to be packaged 7 may shift due to factors such as variations in the dimensions of the baked bread during the baking process. There are cases. If this relative position shifts, the packaged object 7
When the end sealers 14 and 15 perform the lateral seal 16, they become trapped.

FIG. 7 shows a sealer jamming prevention mechanism in a conventional packaging device. A photoelectric switch 57 is installed on the lead conveyor 13, and a sprocket 46 that rotates via a chain 47 by a sprocket 44 that is fixed to the output shaft of the speed governor 40 and a timing shaft 45 to which it is fixed are installed. . This timing axis 45 has an actuator 51.
is attached and the proximity switch 52 detects this position. Now, the packaged object 7 and the end sealers 31, 3
When the positional relationship of 4 is appropriate and as shown in Figure 5,
A photoelectric switch 57 on the lead conveyor 13 is installed between the objects 7 to be packaged, and the actuator 51 is set so that when the photoelectric switch 57 is not detecting the object 7 to be packaged, the proximity switch 52 is detecting the actuator 51. put. If the packaged object 7 is displaced, the photoelectric switch 57 detects the packaged object 7 and the actuator 51 is detected by the proximity switch 52, or the photoelectric switch 57 detects the packaged object 7.
However, the actuator 51 is not detected by the proximity switch 52. A circuit was built to stop the machine in such a situation.
When the machine stops, the displaced object to be packaged 7 is manually removed, the packaging device is started again, and the work is restarted.

Problems to be Solved by the Invention In the above-mentioned jamming prevention mechanism, the positional shift of the packaged object 7 is detected and the packaging device is stopped, and each time the shifted packaged object must be manually removed or corrected. This requires a lot of manpower, and furthermore, it significantly reduces the operating rate of the equipment.

The present invention aims to solve such problems.

Means for Solving the Problems In order to achieve the above object, the packaging device according to the present invention supplies a packaged object to a packaging film formed into a bag by a bag forming machine using an entrance conveyor, and The body is conveyed by a lead conveyor while it is embedded in the film to an end sealer attached to a pair of upper and lower end sealer shafts equipped with a clutch and a brake in order to seal the packaging film.
A detection device installed on the lead conveyor detects the distance between the objects to be packaged, and a preset signal is generated using this detection signal and a signal generator attached to a timing shaft that is connected to the end sealer shaft and rotates. It has an arithmetic circuit that generates a signal when the object to be packaged on the lead conveyor is in an abnormal position by comparing it with a reference pulse every rotation, and a memory circuit that memorizes this signal. With the brake in operation and the brake in operation, only the end sealer shaft is stopped rotating at a position where the object to be packaged does not contact the upper and lower end sealers, and the packaging device continues to operate as it is to catch the object to be packaged. Let it be discharged without any problem. Next, when the object to be packaged is transferred to the normal position, no signal is generated from the arithmetic circuit and the memory circuit, the brake is deactivated, the clutch is activated, and the end sealer rotates to return to the normal position. It is characterized by being in an operating state, and it automatically prevents objects that may be caught in the wrapping without stopping the operation of the packaging equipment, so the packaging equipment can be operated without reducing operating efficiency. Continuous operation is performed.

Embodiment An embodiment of the present invention will be described with reference to FIG. 2. The object to be packaged 7 is placed into a film 4 formed into a bag by a bag forming machine (not shown), and is passed through an entrance conveyor (not shown). Move in the direction of the arrow while being pushed in. The film 4 is transferred to the end sealers 31 and 3 by the lead conveyor 13 with the packaged object 7 built therein.
4. 30 is an upper end sealer shaft, and an end sealer 31 is attached to the center of this sealer shaft 30, and a gear 32 is attached to the end. 33
is a lower end sealer shaft, an end sealer 34 is attached to the center of the sealer shaft 33, and a sprocket 37 is fixed to an armature 36 via a synchro-tooth clutch 35 that is always connected to the drive side only at a fixed position. has been done. A gear 39 is fixed to the other end of the sealer shaft 33, and a brake 38 is attached coaxially thereto. Since this gear 39 and the gear 32 fixed to the upper end sealer shaft 30 mesh with each other, the upper and lower end sealers 31 and 34 always rotate synchronously.

A sprocket 37 fixed to the lower end sealer shaft 33 and a sprocket 42 fixed to the output shaft 41 of the speed governor 40 are connected by a chain 43. Another sprocket 44 is fixed to this output shaft 41, and is connected by a chain 47 to a sprocket 46 which rotates a timing shaft 45 which also rotates once for each revolution of the lower end sealer shaft 33.

A signal (pulse) is provided at the other end of the timing axis 45.
A signal generator (pulse encoder 50) that generates
A timing actuator 51 is also attached for actuating a clutch 35 and a brake 38 attached to the lower end sealer shaft 33. 52 to 56 are proximity switch groups;
2 and 53 are a clutch on sensor and a clutch off sensor of the clutch 35; 54 and 55
are a brake-on sensor and a brake-off sensor for the brake 38, and 56 is a reset sensor. 57 is a photoelectric switch that detects the positional shift of the packaged object.

A sprocket 49 fixed to an input shaft 48 of a speed governor 40 is connected to a drive sprocket 62 fixed to an output shaft 61 of a drive motor 60 and sprockets 64 and 65 fixed to an intermediate shaft 63 by chains 66 and 67. has been done.

A sprocket 73 for driving a film feeding transmission 70, a film feeding sprocket 71, and an encoder 72 for detecting film feeding is fixed to the intermediate shaft 63. Reference numeral 74 indicates a chain for driving a film feeding roller (not shown) and the lead conveyor 13. Reference numeral 75 indicates a chain for driving a sprocket 76 fixed to the shaft of the encoder 72.

When the packaging device is started, the drive motor 60 rotates, and each shaft rotates in unison by the sprocket group and chain group. Along with this, the pulse encoder 50 for rotating the timing shaft 45 and the encoder 72 for detecting film advance also rotate, and generate signals at set timings (described later). At the same time, each actuator 51 also rotates, and the proximity switches 52-56 generate set timing signals.

The lower end sealer shaft 33 is rotated by the rotation of a sealer shaft sprocket 37 via a chain 43 stretched over a sprocket 42 fixed to an output shaft 41 of a speed governor 40.

FIG. 3 shows the packaged object 7 in its normal position (when the end sealers 31 and 34 rotate to seal the film).
A timing chart showing the operating states of the clutch 35 and the brake 38 when the clutch 35 and the brake 38 are conveyed on the lead conveyor 13 while holding the packaged object 7 (in a position where the packaged object 7 is not caught) is shown. Clutch 3 in case of misalignment due to the above circumstances
5 shows a timing chart showing the operating states of the brake 38 and the brake 38.

A indicates the signal of the reset sensor 56, and B indicates the signal of the pulse encoder 50, which is set depending on the size of the object to be packaged 7. In this embodiment,
It is set to pulse.

C indicates a signal from the encoder 72 for film feeding, which is set according to the length of one bag of film used to wrap the object 7, and is set as a y pulse. The reference pulse D is set at (y-x) by the difference between these x and y pulses. The packaged object 7 is moving while being contained within the packaged film 4, and the signal detected by the photoelectric switch 57 is shown at E. F is the reference pulse D and the packaged object 7
A signal obtained by calculating a signal with a detection signal E in a calculation circuit is shown, and G shows a signal of a storage circuit to be stored when signal F is generated. In the case of FIG. 3, it is in a normal state, so signals F and G are not generated.

H to K indicate signals from the proximity switch groups 52 to 55 that operate the clutch 3 and brake 38, H is the clutch off sensor 53, brake on sensor 54, J is the brake off sensor 55, and K is the clutch on sensor. 52 shows the signals generated.

When the photoelectric switch 57 detects a positional shift of the object to be packaged 7, the upper and lower end sealers 31 and 34 are stopped at a position where they do not come into contact with the object to be packaged 7, and then when the normal state is achieved, the upper and lower end sealers 3 are stopped again.
1 and 34, the proximity switches 52 to 55 are set to generate signals H to K at the positions shown in FIG. L and M indicate the mechanical operation of the clutch 35 and brake 38;
indicates the operating state of the clutch 35, and M indicates the operating state of the brake 38.
Indicates the operating status of the

To explain based on FIG. 3, under normal conditions, the clutch 35 is always operating and the brake 3
8 is always in an inoperative state, so the lower end sealer shaft 33 continues to rotate. One upper end sealer shaft 30 rotates synchronously because gears 32 and 39 are engaged with each other. In this state, signals A to E and H to K are generated, but since the signal F of the arithmetic circuit is not generated, the signal G of the memory circuit is also not generated, and therefore the clutch 35 and brake 38 are Continuous operation is performed while maintaining the same state.

To explain based on FIG. 4, the object to be packaged 7 is transferred on the lead conveyor 13 due to some reason, and the object to be packaged 7 is transferred by the upper and lower end sealers 31 and 34.
When inputting the signal, the signal F is generated by calculating the reference pulse D and the signal E, and the signal G of the memory circuit indicates that the signal G is generated. At this time, clutch 3
5 is operating, but after that, the clutch 35 becomes inactive due to the signal H from the clutch-off sensor 53, and after a moment, the brake 38 becomes activated due to the signal I from the brake-on sensor 54, and the upper and lower The end sealers 31 and 34 stop rotating. This is done at a relative angle (FIG. 6) where the upper and lower end sealers 31, 34 do not come into contact with the packaged object 7. For this reason, the packaged object 7 that has been misaligned
passes between the upper and lower end sealers 31 and 34, which are stopped without being laterally sealed. After one cycle has elapsed, a reset signal A is generated by the reset sensor 56 and the memory circuit becomes inactive, but the clutch 35 and brake 38 remain in their current state.

If the next packaged object 7 is transferred in a normal state, the arithmetic circuit will not generate the signal F and the memory circuit will be in an inactive state, so the signal from the brake-off sensor 55 will be J disables the brake 38, and then a signal K from the clutch-on sensor 52 causes the clutch to be activated. For this reason, the lower end sealer shaft 33 starts rotating, and the upper and lower end sealers 31 and 34 engage with each other to seal the film 4.

That is, when the packaged object 7 is contained in the packaging film 4 and is being conveyed on the lead conveyor 13, the photoelectric switch 57 of the packaged object 7 provided on the conveyor 13 detects a positional shift. Then, even if the packaging device is continuously operated by the motor 60, the rotation of the end sealer shafts 30, 33 can be stopped at a predetermined position (at a relative angle at which the end sealers 31, 34 do not come into contact with the packaged object 7), The displaced object 7 is placed between the upper and lower end sealers 3.
1 and 34 without sealing, and then when the packaged object 7 is transferred in a normal state, the upper and lower end sealers 31 and 34, which had been stopped, rotate and sealing is performed.

Effects of the Invention As described above, according to the present invention, even if the object to be packaged is misaligned, the packaging device does not stop.
Since only the end sealer shaft stops to prevent jamming and eject the packaged objects, destruction of the packaged objects can be prevented and the operating rate of the packaging device can be maintained higher than before.

[Brief explanation of drawings]

Fig. 1 is a front view showing the outline of the packaging device, Fig. 2 is a perspective view showing the device of the present invention, Fig. 3 is a timing chart when the objects to be packaged are being transported normally, and Fig. 4 is FIG. 6 is a timing chart diagram in the case where the first packaged object is abnormally transported, and the next packaged object is transported normally. Fig. 5 is a front view showing the end sealer sealing the film, Fig. 6 is a front view showing the end sealer shaft stopped at a predetermined position, and Fig. 7 is a conventional sealer jamming prevention mechanism. FIG. In the drawing, 4 is a packaging film, 6 is a bag forming machine, 7 is an object to be packaged, 8 is an entrance conveyor, 13 is a lead conveyor, 30 is an upper end sealer shaft, 31
is the end sealer, 33 is the lower end sealer shaft, 3
4 is an end sealer, 35 is a clutch, 38 is a brake, 50 is a pulse encoder, 57 is a photoelectric switch, and 72 is an encoder.

Claims (1)

[Claims] 1. A bag-forming device that converts packaging film into bags, an entrance conveyor that supplies the objects to be packaged to the bag-forming device, and a lead that transports the formed packaging film with the objects inside it. A conveyor, a detection device provided on the lead conveyor for detecting the distance between the objects to be packaged, an end sealer attached to a pair of upper and lower end sealer shafts for sealing the packaging film, and the end sealer shaft. a clutch and a brake attached to the end sealer shaft, a timing shaft that is connected to the end sealer shaft and rotates, and a signal generator attached to the timing shaft, and the timing obtained by the timing of the signal generator is provided. A calculation that generates a signal when the packaged object on the lead conveyor is in an abnormal position by comparing a preset reference signal with a detection signal output by a detection device for the packaged object provided on the lead conveyor. and a storage circuit that stores this signal and outputs a signal for disabling the clutch and activating the brake at a relative position where the upper and lower end sealers do not come into contact with the packaged objects; 1. A packaging apparatus comprising: a control circuit which deactivates the brake and activates the clutch when the object to be packaged is in a normal position.