Heat seal device

A heat seal device for being disposed in a bag making apparatus and for heat-sealing at least two continuous sheet panels, the bag making apparatus being configured to feed the sheet panels in a longitudinal direction of the sheet panels and to make plastic bags from the sheet panels, the heat seal device comprising:

• a pair of a first seal unit and a second seal unit configured to face each other in a facing direction perpendicular to a feed direction of the sheet panels, each of the first and second seal units comprising a heat seal member and a heater for heating the heat seal member;
• a drive unit configured to move at least one of the first seal unit or the second seal unit in the facing direction to sandwich the sheet panels between the heat seal member of the first seal unit and the heat seal member of the second seal unit;
• and
• an adjustment unit supporting the pair of the first and second seal units movably in a width direction of the sheet panels perpendicular to the feed and facing directions, the adjustment unit being configured to move the first seal unit in the width direction of the sheet panels and to move the second seal unit in the width direction of the sheet panels in accordance with movement of the first seal unit in the width direction of the sheet panels, wherein:
• the adjustment unit is further configured to be switchable between a first state and a second state, and
• the adjustment unit is configured to move the second seal unit in accordance with the movement of the first seal unit when in the first state and not to move the second seal unit in accordance with the movement of the first seal unit when in the second state.