초록 ▼

In a can seamer, after a control mode of a drive motor has been switched to a type-changing mode, if an action button is depressed, in response to signals issued from a rotational position sensor, the drive motor moves can seaming mechanisms one pitch by one pitch via a center shaft and stops at pre

In a can seamer, after a control mode of a drive motor has been switched to a type-changing mode, if an action button is depressed, in response to signals issued from a rotational position sensor, the drive motor moves can seaming mechanisms one pitch by one pitch via a center shaft and stops at predetermined positions. At the stopped position, an actuator is operated to depress the top end of a seaming roll shaft. By this operation, a gap clearance is formed between a rotary frame and a seaming lever. Then seaming rolls are dismounted and replaced. The seaming lever connected with a seaming chuck via a bracket is removed, and thereby a type-changing work can be carried out. In addition, in the type-changing work of the can seamer, the vertical positional adjustment in a fitting between a seaming lever and seaming rolls is easily carried out. Furthermore, the knock-out pad can be replaced in a one-touch operation.

대표청구항 ▼

1. A changing apparatus in a can seamer comprising a can seamer main body frame having a vertical center axis, a rotary frame rotatable about the vertical center axis, a plurality of can seaming mechanisms circumferentially distributed about the vertical center axis, at a constant pitch and equidist

1. A changing apparatus in a can seamer comprising a can seamer main body frame having a vertical center axis, a rotary frame rotatable about the vertical center axis, a plurality of can seaming mechanisms circumferentially distributed about the vertical center axis, at a constant pitch and equidistant from the vertical center axis, each said can seaming mechanism including a seaming roll shaft carried by said rotary frame, a set of two seaming rolls removably mounted on a lower end of said shaft, a rotatable can table for supporting a bottom of a can and a seaming chuck rotatable with said can table for supporting a lid of the can from above, said changing apparatus comprising: an actuator mounted on the can seamer main body having a vertically downwardly movable actuator member for depressing the top end of one of the seaming roll shafts when the corresponding can seaming mechanism is at a stop position; and a rotational position detector detecting the rotational position of the seaming roll shafts such that the shafts can be stopped at said stop position below said actuator. 2. The changing apparatus of claim 1, wherein the seaming roll shafts are vertically movable mounted on the rotary frame and are upwardly biased such that downward movement of said actuator member moves the seaming roll shaft downwardly to a changing position. 3. The changing apparatus of claim 1, wherein said rotational position detector comprises a disc rotating proportionally to rotation of the rotary frame relative to the main body frame and an approach sensor detecting the rotary position of said disc. 4. The changing apparatus of claim 1, wherein said rotational position detector comprises a fixed position sensor on the main body frame detecting the top ends of the seaming roll shafts. 5. The changing apparatus of claim 1, wherein a drive motor drives the rotary frame in rotation relative to the main body frame, said rotational position detector and said drive motor forming part of an actuatable control means for rotating the rotary frame by one pitch to move the seaming roll shafts and stop movement when a next one of the seaming roll shaft moves under said actuator at said position in response to a single actuation of said control means. 6. The changing apparatus of claim 1, wherein said actuator is pneumatic. 7. A can seamer apparatus, comprising: a can seamer main body frame having a vertical center axis; a plurality of can seaming mechanisms circumferentially distributed about the vertical center axis at a constant pitch and equidistant from the vertical center axis, each said can seaming mechanism having a rotatable can table for supporting a bottom of a can, a rotatable seaming chuck for supporting a lid of the can from above, and a set of two seaming rolls pivotable on a seaming roll shaft, whereby a can covered with a can lid can be gripped between said can table and said seaming chuck and rotated about a vertical axis so that a top edge of the can and the lid are seamed by a said seaming roll; an actuator mounted on said can seamer main body frame for depressing a top end of said seaming roll shaft; and a means for rotatably moving said can seaming mechanisms about the vertical axis pitch by pitch relative to said actuator and stopping said can seaming mechanisms at predetermined positions where said seaming roll shafts are below said actuator, said means comprising a drive motor and a seaming roll shaft rotational position detector. 8. The can seamer apparatus of claim 7, wherein said rotational position detector comprises a disc rotatably interlocked with rotation of said seaming roll shaft about the vertical center axis and an approach sensor for detecting a rotational angle of said disc. 9. The can seamer of claim 7, wherein said rotational position detector comprises a fixed position sensor detecting the top ends of said seaming roll shafts.