JPS6128719Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting device used in, for example, a bag making machine that makes bags made of synthetic resin film.

Generally, when making a bag using synthetic resin film, the tubular film is fed a certain length at a time, the ends are sealed by thermal bonding, and the film is thermally cut to form a certain length.

In this case, the cutter is heated and brought into contact with the tube film to cut it, but if the cutting operation is continued, the melted synthetic resin carbon will adhere to the cutter blade and accumulate, impairing heat conduction. It becomes impossible to make cuts.

Therefore, the machine must be stopped at predetermined intervals to clean the cutter, which is an obstacle to continuous operation.

The present invention attempts to improve these points, and allows the cutter to be used for a long period of time without the carbon of the synthetic resin accumulating in the cutter.

Next, an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes an upper seal bar serving as one of the platforms, and a pair of welding projections 2 are formed on the lower end surface of this upper seal bar 1 in parallel with a distance from each other. A long and narrow recess 3 is provided between the pair of welding projections 2, and a cutter 4 having a blade portion at its lower end is attached to this recess 3 so as to be movable vertically and horizontally by a drive mechanism (not shown).
A pay-out side 5 and a winding shaft 6 are arranged on either side of the recess 3, and a receiving shaft 7 is provided at the top of the recess 3. A Teflon cloth 8 covering the undersides of the pair of welding protrusions 2 is stretched between the pay-out side 5 and the winding shaft 6 via the receiving shaft 7.

The upper seal bar 1 is provided with a heat source (not shown) for heating the cutter 4 together with the upper seal bar 1, and is moved up and down by a drive mechanism (not shown).

Reference numeral 11 denotes a lower seal bar serving as the other stand disposed opposite to the upper seal bar 1;
A receiving frame 12 made of aluminum or the like and having a concave cross section is attached to the upper end surface of this seal bar 11, and a pair of welding protrusions 13 are formed on the upper surface of this receiving frame 12, opposing the pair of welding protrusions 2. A Teflon sheet 14 is adhered onto the welding protrusion 13. Further, a recess 15 corresponding to the cutter 4 is formed between the pair of welded protrusions 13, and a cleaning body 16 made of felt or the like impregnated with silicone oil or the like is fitted into this recess 15. A cut 17 is formed in the cutter 16 to face the blade portion of the cutter 4 from the upper surface.

The lower seal bar 11 is provided with a heat source (not shown).

It is a tube film made of 21% thermoplastic composite resin, and is sent in a flat state.

In this situation, the upper seal bar 1
and cutter 4 incorporated in this seal bar 1
At the same time, the lower seal bar 11 is heated, and the upper seal bar 1 and the lower seal bar 1 are heated.
A tube film 21 is intermittently fed by a constant length into the gaps between the tubes 1 and 1.

Then, as the tube film 21 stops, the upper seal bar 1 is simultaneously lowered onto the lower seal bar 11, and the tube film 21 is clamped by each pair of welding protrusions 2 and 13. While thermally adhering 22, the cutter 4 is lowered and moved laterally to perform thermal cutting 23 at the center between the thermally bonded 22 parts.

Next, the upper seal bar 1 is raised, the tube film 21 is fed a certain length and stopped, and heat welded 22 is carried out in the same manner as described above.

In this manner, the tube film 21 is successively sealed and cut to form a bag body, and one end is cut into a handle shape to form the bag 24.

At this time, the upper seal bar 1 descends and the tube film 21 is thermally cut 23 by the cutter 4, and the blade of the cutter 4 contacts the cleaning body 16 of the lower seal bar 11 through the cut 17, The cutter 4 is wiped and cleaned with a cleaning liquid such as silicone oil soaked in this.
The blade is always kept clean.

According to the present invention, the synthetic resin film is cut by the cutter, and the blade of the cutter is cleaned by the cleaning body, so that carbon of the synthetic resin does not accumulate on the blade of the cutter, and it can be used continuously for a long time. can.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the device of the present invention, FIG. 2 is a plan view of a synthetic resin film, and FIG. 3 is a perspective view of a bag. 1... upper seal bar as one stand, 4
... cutter, 11 ... lower silver as the other stand, 16 ... cleaning body, 21 ... synthetic resin film.

Claims (1)

[Scope of utility model registration request] A pair of stands facing each other with a gap through which the synthetic resin film passes, at least one of which is movable relative to the other, and a heated cutter provided on one of the stands with respect to the other. and a cleaning body provided on the other table for wiping the blade of the cutter.