JPH0329643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing discrepancies between carton sealer flaps when the flaps are completely glued and are not opened or closed after shipping.

In a conventional device of this kind, a glued flap is folded in with a guide rod and crimped with a press roller, but when the flap is pressed into the press roller, a misalignment of up to about 5 mm occurs.

This gap in the flap is due to the characteristics of the carton.
This occurs due to factors such as guide width, guide height, angle of being pushed into the press roller, and timing.

Recently, quality requirements for misalignment have increased, and when the amount of misalignment exceeds 3 mm, complaints are raised.
In order to prevent discrepancies of more than mm, we have tried adjusting the guide width, feed bar angle, etc., but the product is not stable in any direction, and the current situation is that several pallets of defective products are produced every day.

This invention has the following configuration in order to solve the above technical problem.

It consists of a feed bar for transporting the glued carton, a folding guide for folding the flap, a finger for aligning the flap tips, a roll for temporary pressing, and a press roller for crimping the carton. Features a carton sealer flap misalignment prevention device.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the figure, numeral 1 is a feed bar for conveying a carton c with glue b attached to a flap d on a roll a, and is moved above the roll. 2 is a folding guide for folding in the flap d fixed above the roll. 3 is folded flap d
This finger engages with the tip of the roll to align the flaps, and the finger is attached to a bracket 13 fixed to a block 17 that is reciprocatably supported by a spline shaft 13 provided along the upper part of the roll. A swingably supported lever 9
The height can be adjusted by several millimeters via a linear motion bearing 16.
A tension coil spring 1 is connected between the base end side of the block 17 (the right side in FIG. 2) and the fixed frame 20.
1 is suspended and biased to the right in FIG. 2 by the tension of a spring. 8 is block 17
The stopper block is supported through a support hole 20 (see FIG. 7) formed in a bracket 18 fixed to the bracket 18, and as shown in FIG.
It consists of a cylindrical portion 21 having approximately the same diameter as 0, and a flange 22. Almost at the lower half of the tip of the cylindrical portion, there is a tip surface 25 and a step surface 26 located inside by a predetermined height from the tip surface, and the step portion serves as a stopper surface with which the upper end of the lever 9 engages. 23. Further, an inclined surface reaching from the stepped surface 26 to the tip end surface 25 is formed in the upper half portion, and the inclined surface serves as a cam 24 for retracting the stopper block 8 along the support hole 20, as will be described later. It is becoming. The cylindrical portion of the stopper block 8 passes through the support hole, and a sixth hole is formed on the outer surface of the flange 22.
As shown in the figure and FIG. 7, the curved surface of the curved leaf spring 19 fixed to the bracket 18 comes into contact with the bracket 18,
The stopper block 8 is biased so that its flange comes into contact with the bracket 18.

The lever 9 is rotatably supported by a shaft 28 on a bracket 27 that hangs down and is fixed to the tip of the block.
Since the finger 3 is biased to rotate clockwise in the figure, its tip comes into contact with the stopper surface 23 of the stopper block and is prevented from rotating, and normally the finger 3 is kept in a vertical position. There is.

5 is a cylinder attached to a fixed frame, and a temporary press roll 6 for temporarily pressing the flap of the carton is attached to the tip of the rod;
When the finger 3 reaches position A, it is actuated by an air valve 4 to press the flap of the carton that has reached that position.

Reference numeral 7 in FIG. 3 is a cam follower supported by a fixed frame at a position above position B where the cam 24 of the stopper block 7 passes in FIG. When the cam 24 of the par block hits, the cam action pushes the stopper block 8 inwardly along the support hole 20 formed in the bracket 18 against the curved leaf spring 23, thereby engaging the stopper surface 23. Release the engagement with the lever 9 that was engaged.

12 is a press roller for pressing the flap d of the carton c. 15 is a return block provided on the fixed frame, and block 1
Immediately before the lever 7 returns to its original position, it engages with the upper end of the lever 9 to return the lever 9 to its vertical position.

The apparatus of this embodiment is constructed as described above and operates as follows.

First, while the carton c with the glue b attached is being conveyed by the feed bar 1 on the roll a, the flap d is folded in by the folding guide 2.
The finger 3 is stopped while maintaining a vertical state by the stopper surface 23 of the stopper block 8.
The tip of the flap touches the. By continuing to push carton c in this state,
The finger 3 is pushed by the flap, and the block 17 also moves to the left in FIG. 2 along the spline shaft 13 against the tension of the coil spring 11. During this time, the tips of the flaps are naturally aligned by the fingers and any discrepancies are corrected.

Next, when the carton c is transported to the A position with the flaps d aligned, the air valve 4 is operated by the block 17, the cylinder 5 is activated, and the temporary press roll 6 at the tip of the cylinder rod is moved to the carton c. As the carton moves upward, temporary pressing is performed with the tips of the flaps d aligned.

Furthermore, when the carton c is conveyed to position B by the feed bar 1, the cam follower 7 fixed to the fixed frame at this position hits the cam 24 of the stopper block 8, and as the carton moves, the block is stopped. As shown by the arrow in Figure 3,
Push the bracket 18 inward along the support hole 20. As a result, the lever 9 that was locked to the stopper surface 23 is released, and the lever 9 rotates about the shaft 28 as a fulcrum and jumps up due to the tension of the torsion coil spring 10. Along with this, the finger 3 also rotates and the flap When the carton is disengaged, the carton can be moved independently. In this state, the upper end of the lever 9 is located on the front end surface 25 of the stopper block 8, and the block is maintained in the pushed-in state. As the finger 3 disengages from the carton, the block 17 is pulled back by the tension of the tension coil spring 11.

On the other hand, the carton c is further conveyed by the feed bar 1, and as it passes under the press roller 12, the flap is pressed by the press roller 12.

Also, when the block 17 is pulled back to its original position along the spline shaft 13 by the tension coil spring 11, it engages with the air valve 14, which operates to pull up the temporary press roll 6 and temporarily release the press roll 6. Reset the press roll 6 to its original state. When the block 17 further moves to the right, the upper end of the lever 9 comes into contact with the return block 15 fixed to the fixed frame and is locked, and as the block moves back, the lever 9 moves back to the shaft 2.
6 as a fulcrum and is rotated counterclockwise to return to the original vertical state. As a result, the stopper block 8 is released from being pushed away by the tip of the lever 9, is pushed outward by the leaf spring 23, and the stopper surface 23 and the lever tip engage again, and the lever is reset to the vertical position. Hold the next carton c.

By repeating the above operations, the flaps of cartons that are sent one after another can be crimped in a state in which the discrepancies are reliably corrected and aligned.

Note that the height of the carton c varies by several millimeters, but this variation can be absorbed by adjusting the height of the finger 3 using the linear motion bearing 16 according to the variation. Moreover, by attaching the spline shaft 13 so as to be adjustable and adjusting its height according to the height of the carton, variations can also be absorbed.

The present invention has the following unique effects due to the above configuration.

The tips of the flaps that have been folded in with the folding guides are gauged with fingers to align them, and in this state they are temporarily pressed with a temporary press roll, and then sent to a press roller and the flaps can be crimped. Therefore, since temporary pressing is performed on the glued portion with the flaps aligned, misalignment of the flaps can be reliably and automatically corrected, and the flaps can also be crimped securely. As a result, according to the present invention, the misalignment of the flaps could be stably kept within about 1 mm.

[Brief explanation of drawings]

Fig. 1 is a partially omitted perspective view of this invention, Fig. 2 is a diagram of the operating state of the finger used in this invention, and Fig. 3 is an operating state of the cam follower, stopper block, and lever used in this invention. Figure 4 is a diagram of the operating state of the lever and return block used in this invention, Figure 5 is a perspective view of the stopper block, Figure 6 is a view taken along the I-I arrow in Figure 2, and Figure 7 is a diagram of the operating state of the lever and return block used in this invention. 7 is an enlarged view of the stopper block support portion of FIG. 6; FIG. 1: Feed bar, 2: Folding guide, 3:
Finger, 4: Air valve, 5: Cylinder, 6: Roll, 7: Cam follower, 8: Stopper block, 9: Lever, 10: Torsion coil spring, 11: Tension spring, 12: Breath roller, 13: Spline shaft, 14 : Air valve, 15: Return block, 16: Linear motion bearing, 18, 27: Bracket,
19: Leaf spring, 20: Stopper support hole, 23:
Stopper surface, 24: cam.

Claims (1)

[Claims] 1. In a carton sealer that has a feed bar for transporting a glued carton, a folding guide for folding the flaps, and a press roller for pressing the flaps, a finger that engages the tip of the folded flap and a A flap misalignment prevention device comprising a temporary press roll that presses the flaps while they are engaged.