JPH07329932A - End seal cutter device - Google Patents

Abstract

PURPOSE:To suppress the warpage of a cutter to be caused by its thermal expansion when sealing bodies and the cutter of an end seal cutter device are heated to stably keep the abutting state of a blade tip and a receiving blade of the cutter. CONSTITUTION:In an end seal cutter device SC so constructed that a pair of sealing bodies 4 provided with a cutter 7 are set in a pair of rotating shafts 1 opposedly to each other, and a roll-form film passing through between the sealing bodies 4 is sealed and cut in a direction crossing the feed direction of the film by rotating the rotating shafts 1 reversely to each other, at least one side of the cutter 7 is divided into a plurality of parts in the width direction thereof, and divided cutter blades 7A, 7B are positionally adjustably mounted on the sealing body 4 through fixing members 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pillow type packaging machine,
The present invention relates to a seal cutter device that is applied to a horizontal or vertical bag-making filling and packaging machine such as a three-way or four-side seal packaging machine and cuts a tubular film that fills and embeds an article while heating and adhering the film. It relates to the device.

[0002]

2. Description of the Related Art As an end seal cutter device implemented in this type of packaging machine, for example, in a packaging machine typified by a horizontal pillow packaging machine, a tubular packaging film for packaging an article to be packaged is provided for each article. Before and after that, it is necessary to perform heat sealing and cutting, and for this reason, an end seal cutter device that rotates in synchronism with the transfer of the film is provided.

An example of this end seal cutter device is shown in FIG.
To FIG. Rotating shafts 1 are provided in parallel so as to traverse in the width direction of a tubular packaging film F1 in which an object to be packaged W is wrapped, and the rotating shafts 1 are provided with parallel cutouts. A seat 2 is provided, and a seal body 4 for heat-sealing in the width direction of the packaging film F1 is fixedly held on each seat 2 via a fixing bolt 3. Each of the sealing bodies 4 has a sealing surface 5 formed on the circular arc surface of the tapered free end thereof, which is appropriately longer than the width of the tubular film F1.
A concave groove 6 is formed along the central longitudinal direction of each sealing surface 5, and a cutter 7 is fitted into the concave groove 6 and fixed by turning by a cutter fixing bolt 8.

Further, when the rotary shafts 1 are meshed with each other by gears 9 and the like, and the rotary shafts are rotated at unequal angular speeds, the tubular film F1 of the sealing body 4 moves in a direction intersecting the transfer direction. It is heat-sealed by the sealing surface 5 and cut by the pair of cutters 7 along the width direction of the tubular film F1 in a state where the article (article) W to be packaged is filled and incorporated. A heater 10 is embedded in the seal body 4.

[0005]

By the way, in the end seal cutter device having the above-mentioned conventional structure, the tubular film is adjusted by adjusting the contact between the blade edge of one cutter 7 and the receiving blade of the other cutter 7. In order to perform reliable cutting of F, a shim (spacer) is generally provided in the groove 6 of the seal body 4.
By setting the assembly position of the cutter 7 via 11 and rotating and tightening with the cutter fixing bolt 8, the blade tip of one cutter 7 and the receiving blade of the other cutter 7 are brought into flat contact with each other.

However, when the seal body 4 and the cutter 7 are thermally expanded by the heating of the heater 10 embedded in the seal body 4, the cutter 4 is elongated along the width direction with respect to the seal body 4 and the cutter fixing bolt 8 is provided. Since it is screwed and fixed to the center, the center of the cutter 4 is warped due to the difference in the expansion rate, and as a result, the contact edge of one cutter 7 and the receiving edge of the other cutter 7 are evenly changed over the entire length. Occurs, which affects the cutting of the tubular film F1.

Therefore, according to the present invention, when the seal body and the cutter are heated, the warp due to the thermal expansion of the cutter is suppressed as much as possible, and the end-seal which can keep the abutting state between the blade edge of each cutter and the receiving blade stable. An object is to provide a cutter device.

[0008]

According to the present invention, a pair of rotary shafts arranged in parallel to each other and a pair of seal bodies having cutters on the rotary shafts are provided so as to face each other. In the end-seal cutter device configured to rotate in mutually opposite directions and pass through between the respective sealing bodies, the tubular film for packaging is sealed and cut in a direction intersecting the transfer direction, In the end seal cutter device, the cutter is divided into a plurality of parts in the width direction, and the divided cutter blades are attached and fixed to the seal body via a fixing member so as to be positionally adjustable.

[0009]

The warp due to thermal expansion is divided by the cutter blade divided in the width direction, and the abutting state between the blade edge of the cutter blade and the receiving surface is kept substantially constant.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a first embodiment of the present invention, and the same parts or equivalent parts as those of the conventional structure described above will be described using the same reference numerals. In the figure, since the end seal cutter device of the present invention can be applied to both horizontal and vertical packaging machines, in this embodiment, the end seal cutter device applied to the horizontal pillow packaging machine is used. In the wrapping machine of this example, the article W is transported at a constant speed by the carry-in conveyor H, while the strip-shaped film F continuously fed from the roll-shaped film body R is used.
Is folded into a tubular shape while passing through the bag making machine S, and at this time, the article W is wrapped in the film F1. And film F
The article W wrapped by is heat-sealed into a tubular shape with the film F by a pair of left and right side seals SS.
Subsequently, each time the end seal cutter device SC, which will be described later, operates once, the tubular film F1 is end-sealed and cut at two locations, and the article W is enclosed in one pillow bag PF and sent out by the carry-out conveyor B. ing.

In the end seal cutter device SC, a pair of rotating shafts 1 are arranged vertically and in parallel with each other so as to traverse the transport direction of the tubular film F1, and each rotating shaft 1 is flat. A notch-shaped receiving seat 2 is provided in the seat 2, and a sealing plate 4 for heat-sealing the receiving seat 2 with a fixing bolt 3 along the width direction of the packaging film F1.
Is attached and fixed.

Each of the sealing bodies 4 is formed with a sealing surface 5 on the circular arc surface of the free end of the tip, which is appropriately longer than the width of the tubular film F1, and along the central longitudinal direction of each sealing surface 5 portion. A groove 6 is formed as a result of which the seal surface 5 is divided into two parts.

In this embodiment, an integrally formed cutter 7 is fitted along the longitudinal direction of the groove 6 in the groove 6 of the seal body 4 attached to the rotary shaft 1 arranged on the upper side. The cutter 7 is clamped and fixed to the seal body 4 by a cutter fixing bolt 8 serving as a fixing member. Further, the seal body 4 attached to the other rotating shaft 1 arranged on the lower side
The cutter blades 7A and 7B, which are formed by dividing the entire cutter 7 into two, are fitted in the concave grooves 6 of the respective grooves 6 by the cutter fixing bolts 8. It is fastened and fixed to the lower seal body 4.

In this embodiment, a corrugated blade 17 having a zigzag cut shape of the tubular film F1 is formed as a blade tip of the one cutter 7 located on the upper side, and the other cutter 7 is opposed thereto. A flat plate-shaped receiving blade 17A is formed on the cutting edge of each cutter blade 7A, 7B.

Gears 9 are formed on the rotary shaft 1 so as to be meshed with each other, and these gears 9 are driven by a motor or the like (not shown). A heater 10 is embedded in each of the upper and lower seal bodies 4 along the longitudinal direction of the seal body 4, and at the deepest portion of the concave groove 6 of the seal body 4, the heater 10 and the corrugated blade 17 of the cutter 7 are divided into two parts. A shim (spacer) 11 for adjusting the contact between the cutter blades 7A and 7B and the receiving blade 17A is provided.

In the above structure, the article W is contained in the film F.
At the same time as the tubular film F1 that wraps around and is heat-sealed in a tubular shape by the side seal SS is sent to the location of the end seal cutter device SC, the rotary shafts 1 are rotationally driven in mutually opposite directions by the driving of a motor not shown. ,
With the sealing bodies 4 attached to the upper and lower rotary shafts 1 facing each other, the sealing surfaces 5 of the pair of sealing bodies 4 form two rows in a direction intersecting the transport direction of the tubular film F1. Is heat-sealed by pressure bonding, and at the same time, it is cut in zigzag by the corrugated blade 17 and the receiving blade 17A, and is sent out onto the carry-out conveyor B in a state where the article W is enclosed in the pillow bag PF.

By the way, the heater 10 seals the
When the cutter 7 and the like are heated, the seal body 4 and the cutter 7 thermally expand, but the cutter 7 attached to the seal body 4 arranged on the lower side as in this embodiment is moved in the longitudinal direction of the concave groove 6. By forming the cutter blades 7A and 7B by dividing the cutter blades 7A and 7B into two parts, the warping phenomenon of the cutter 7 due to thermal expansion can be divided by the cutter blades 7A and 7B that are formed into two parts. It is possible to solve the problem that the abutting state of the cutter blade and the cutter receiving blade varies due to the warp of the central portion of the cutter.

That is, as the length of the cutter 7 is increased in the width direction of the tubular film F1, the elongation due to thermal expansion is concentrated and the warp phenomenon is more likely to appear, but in the width direction of the tubular film F1. Along the cutter blades 7A and 7B, which are formed in two, in this embodiment, the expansion due to thermal expansion can be divided into two, thereby suppressing the warp as much as possible.

FIG. 5 shows a second embodiment of the present invention.
Here, cutter blades 7C, 7 are formed by dividing the entire cutter 7 into three parts along the longitudinal direction of the concave groove 6 of the seal body 4 attached to the rotating shaft 1 arranged on the upper side.
D and 7E are fitted into the cutter blades 7C and 7C, respectively.
D and 7E are the upper seal body 4 by the cutter fixing bolt 8.
It is tightened and fixed to. Also, these cutter blades 7C, 7
The following abutment adjusting mechanism is employed to adjust the contact between the wave blades 17 of D and 7E and the receiving blade 17A of the lower cutter 7 to reliably cut the tubular film F1. That is, as shown in FIGS. 5 and 6, two through screw holes are formed in the rotary shaft 1 located on the upper side in correspondence with the positions of the cutter blades 7C, 7D, 7E, and the through screw holes are projected. Screw the contact adjustment bolts 20 into each
The tip of 20 is formed so as to come into contact with the back surface of each of the cutter blades 7C, 7D and 7E located on the side opposite to the corrugated blade 17.

Therefore, with respect to the receiving blade 17A of the cutter 7 attached to the lower seal body 4, the cutter blades 7C, 7C,
The corrugated blades 17 serving as the respective cutting edges of 7D and 7E are brought into contact with each other, and in this state, the corrugated blades 17 which are all the longitudinal cutting edges of the respective cutting blades 7C, 7D and 7E hit the receiving blade 17A on average. , The cutter blade 7 by screwing the abutting adjustment bolt 20.
After adjusting the pressing force with respect to C, 7D, and 7E, and performing this abutting adjustment, the lock nut 21 is rotated around the rotary shaft 1 and fixed.

Next, a cutter fixing bolt 8 is screwed on the upper seal body 4 to form cutter blades 7C, 7 divided into three parts.
By tightening and fixing D and 7E to the seal body 4,
With the predetermined pressing force set, each cutter blade 7C, 7D,
It is possible to appropriately adjust and set the degree of contact between the wave blade 17 of 7E and the receiving blade 17A of the cutter 7.

In the first embodiment described above, the cutter on the receiving blade side is divided into two parts, and in the second embodiment, the cutter on the wave blade side is formed into three parts to form the cutter blade.
Not only one cutter but also one on both sides may be divided into a plurality to form a cutter blade, and the cutter blade may be a corrugated blade as well as a flat blade, and the number of divided blades May be set appropriately.

[0023]

According to the present invention, a pair of rotating shafts arranged in parallel to each other and a pair of seal bodies having cutters on the rotating shafts are provided so as to face each other, and the rotating shafts are opposite to each other. In the end seal cutter device configured to rotate and rotate the tubular film for packaging passing between the respective sealing bodies in a direction intersecting the transport direction and cut the at least one cutter in the width direction. A plurality of divided cutter blades are formed, and the divided cutter blades are attached and fixed to the seal body via a fixing member so that the position of the cutter blades can be adjusted. The pressure can be adjusted substantially uniformly along the lengthwise direction of the cutter, which enables stable heat sealing and cutting of the tubular film.

[Brief description of drawings]

FIG. 1 is a schematic view of a horizontal pillow packaging machine showing a first embodiment of the present invention.

FIG. 2 is a front view showing a main part of the end seal cutter device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an end seal cutter device which is a main part of FIG.

FIG. 4 is an exploded perspective view showing a main part of FIG.

FIG. 5 is a vertical cross-sectional view of a main part showing a second embodiment of the present invention.

FIG. 6 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 7 is a front view showing a conventional end seal cutter device.

FIG. 8 is a sectional view showing a main part of a conventional end seal cutter device.

FIG. 9 is a perspective view of the cutter showing that the cutter is thermally deformed by thermal expansion of the heater of the conventional example.

[Explanation of symbols]

 1 rotary shaft 2 seat 3 fixing bolt 4 sealing body 5 sealing surface 6 concave groove 7 cutter 7A, 7B, 7C, 7D, 7E cutter blade 8 cutter fixing bolt 10 heater 11 shim (spacer) 17 corrugated blade 17A receiving blade 20 thrust Adjusting bolt 21 Lock nut F Film F1 Cylindrical film W Article SC End seal cutter device

Claims (1)

[Claims] 1. A pair of rotating shafts arranged parallel to each other,
This rotary shaft is provided with a pair of seal bodies having cutters opposed to each other, and the tubular film for packaging that passes between the seal bodies by rotating the rotary shafts in mutually opposite directions is transferred. In an end seal cutter device configured to seal and cut in a direction intersecting a direction, the at least one cutter is divided into a plurality of parts in the width direction, and the divided cutter blades are fixed to the seal body. An end seal cutter device, wherein the end seal cutter device is mounted and fixed so as to be positionally adjustable via a member.