NL8403677A - DEVICE FOR APPLYING A TAPE TO A PACKAGE. - Google Patents

Description

A i '-S

Ψ -1- 24356 / CV / TV

Short designation: Device for applying a tape around a package.

The present invention relates to an apparatus for applying a tape around a package by means of which a thermoplastic tape arranged in a loop around a package can be stretched and the overlapping ends of the tape welded together.

Devices for applying a tape by means of which a thermoplastic tape arranged around a package can be stretched and by means of which the overlapping ends of the tape can be automatically welded together are generally used in the packaging technique.

In these conventional packaging machines, a sliding plate is supported by a table on which a bandable package 15 is placed. The sliding plate is movable perpendicular to the direction in which the belt is fed. Below the sliding plate are arranged: a first clamp arranged to press the leading end of the belt against the lower surface of the sliding plate, a second clamp adapted to move upwards after the belt has been tightened and the overlapping part of the belt against the pressing the lower surface of the sliding plate prior to inserting a heating member between the upper and lower overlapping parts of the belt, a pressing device which presses the overlapping part of the belt against the lower surface of the sliding plate when the heating member is inserted between the upper and lower overlapping parts of the belt, and a cutting blade adapted to cut the lower of the two overlapping parts of the belt.

When using such a conventional device for applying a tape to a package or package, the tape is pulled off a reel, wrapped around the package, and tightened to compress the package if the leading end portion of the tape is against the first clamp the bottom surface of the sliding plate is pressed. Thereupon, the overlapping portion of the tape is clamped between the top surface of the second clamp and the bottom surface of the slide plate and the heater is inserted into a space left between the top and bottom 8403677 '4.

-2- 24356 / CV / tv overlapping parts of the belt, these being pressed against the bottom surface of the sliding plate by the pressing device. Then the bottom of the two overlapping portions of the belt is cut and welded to the top and the sliding plate retracts from the space between the package and the belt.

Belts used in such machines have different widths in order to accommodate different uses depending on the dimensions and types of packaging.

It is therefore generally customary for the web for the belt to be formed in a packaging machine so that a belt of maximum width can move therethrough.

The bonding strength in the overlapping portion of the tape is influenced by the size of contact surface with which the two ends of the tape are attached to each other. In the case of a wide tape, a sufficiently large contact surface is obtained even if one end of the tape differs slightly in width direction from the other end of the tire.

However, if such a width deviation occurs in the case of a narrow band, such as for example a band with a width of 6 or 9 millimeters, a particularly small contact surface between the overlapping parts will result, resulting in a correspondingly poor bond strength. . Therefore, accurately superimposing the overlapping ends of the tape is of great significance in the case of a narrow tape.

On the other hand, a wide belt requires a relatively high power mechanism for welding and cutting the belt. This requirement must be met by a relatively large-sized machine, which complicates manufacture and consequently increases manufacturing cost.

In addition, it is not economical to use such a large-sized machine for winding a narrow tape around a package.

Under these circumstances, it is an object of the present invention to provide a tape application machine to obtain a package that is small in size, inexpensive, simple in construction, yet capable of accurately extending one end of a tape above the tape. place other end without deviation 8403677 * I * -3- · 24356 / CV / TV in transverse direction.

It is another object of the present invention to provide a tape-applying machine for packaging, which is particularly suitable for wrapping a narrow tape around a package.

According to the present invention, a main shaft supported by the base of the machine for applying the tape around the package bears a hinged member. The upper end of the hinged member is provided with a support member against the bottom surface of which the overlapping portion of a belt is pressed while cutting the belt. Clamps for clamping the belt in conjunction with the support member, a belt cutter, a belt press device, and a cam mechanism, which imparts upward and downward movement to these elements, are mounted on the hinged member so as to be arranged directly below the support member.

The hinged member is opposite a side piece when the hinged member is in an upright position. In conjunction with the hinged member, the side piece prevents belt deviation in width direction.

A heater insertable and retractable from below the support member is disposed at the rear of the hinged member. A tape guide is hinged on the side piece and adapted to move back there when the first clamp is moved upward.

When the tape guide is in its inoperative position, the tape guide and the bottom surface of the support member 25 form a guideway into which the tape is to be inserted. When the belt splitting process is completed, the hinged member is inclined to allow the support member to move back from between the belt and the package.

The invention will be explained in more detail below with reference to the accompanying figures, in which a possible embodiment of the construction according to the invention is shown.

Fig. 1 is a front view of a machine for applying a tape to a package according to the present invention, with the parts shown prior to operation. 2 is a side view of FIG. 1;

Fig. 3 shows a front view of FIG. 1 with the parts shown in the position they assume during the welding process;

Fig. 4 is a front view showing the parts shown in the position after completion of the welding process; 8403677 "ttf I" -4-24356 / CV / tv;

Fig. 5 shows in perspective a used tape guide;

Fig. 6 shows an electrical circuit for a belt advance and tightening mechanism;

Fig. 7 shows a side view of the machine for applying the tape around the package, showing a device for discharging bad odors which arise when the tape is heated by the heating member.

As shown in the figures, a device for applying a tape around a package comprises a table 1 provided with a top 2 on which a package or package A for which a tape must be applied can be placed. A thermoplastic band B is pulled out through an elongated opening 3 which is arranged in the top sheet 2. The table 1 further has a base plate 4, to which a pedestal 5 is fixed in such a position that this pedestal is arranged under the elongated opening 3. The pedestal 5 supports a main axis 6 which runs parallel to the elongated opening 3 and a plate-shaped hinged member 7.

As shown in Fig. 1, the height of the hinged member 7 in its upright position is substantially equal to the height of the top sheet 2. When the hinged member 7 is in its upright position, the left vertical surface of the hinged member 7 lies in a plane with the right edge of the elongated opening 3. The hinged member 7 is adapted to pivotally rotate in the space to the left of its right side.

A support member 8 in the form of a rectangular parallelepiped protrudes to the left from the upper free end of the pivotable member 7. The overlapping portion of the belt is pressed against the bottom surface of this support member 8 during the belt splitting process. A holder 9 and a cam mechanism 10 are mounted on the left surface of the pivotable member 7. The holder 9 is arranged under the support member 8 and the cam mechanism 10 is arranged under the holder 9 · In the case of the exemplary embodiment shown in the drawings, the length of the support member 8 measured in the direction crossing the elongated opening 3 equal to the width of the elongated opening 3. The support member 8 may, for example, be 6 or 9 millimeters long in order to correspond to the width of a narrow band.

8403677 '».

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As shown in Fig. 2, a first clamp t1 is adapted to press the leading end of the strap B against the bottom surface of the support member 8, while a second clamp 13 is adapted to move upwards after the strap B is tightened thereby pressing the overlapping portion of the belt B against the bottom surface against the support surface 8 prior to inserting a heater 41 between the upper and lower overlapping portions of the strap, and a pressing device 12 adapted to form the overlapping portions of the pressing band B against the bottom surface of the support member 8 after inserting the heating member 41 between these overlapping portions are held by the holder 9 so as to be able to move up and down individually. The lower of the two overlapping parts of the belt is indicated at B2. The lower belt portion B2 extends through a hole 14 provided in the first clamp 11 in the vicinity of its top end, and is cut through the left edge of the hole 14 (Fig. 2) when the pressing device 12 is moved upward.

The cam mechanism 10 comprises a pair of bearings 15 mounted 20 on the hinged member 7, a horizontal cam shaft 16 mounted in the bearings 15 and driven by a motor M, cams 17, 18 and 19 mounted on the cam shaft 16 for communicating a and downward movement on the first clamp 11, pressing device 12 and second clamp 13, a cam 20 also mounted on the cam shaft 16 to cause the pivotable member 7 to pivot on the main shaft 6, and a cam also mounted on the cam shaft 16 21 for controlling a mechanism for advancing and tensioning the belt. The up and down movement of the first and second clamps 11 and 13, the horizontal movement of the heating member 41, the up and down movement of the pressing device 12, the horizontal movement of the support member 8, and the up and down movement movement of the belt advancing and tensioning mechanism are synchronized using cams mounted on cam 16.

The tape B is pulled off a reel 57 (fig. 7) so that the leading end B2 of the tape B on the table 1 can be advanced through the hole 14, 8403677 9 ΐ -6- provided in the first clamp 11. 24356 / CV / tv through a space between the bottom surface of the support member 8 and the top surfaces of the pressing device 12 and second clamp 13, and through the elongated opening 3.

If the belt B is guided clockwise around the package A in Fig. 2, until the leading end-5 portion of the belt B reaches the lower edge of the right side of the package A, the leading end portion is of the belt B inserted in the space left under the support member 8.

A belt advancing and tensioning mechanism is mounted on the pivotable member 7 along the path to be traveled by the belt B to the hole 14. The belt advancing and tensioning mechanism comprises a drive roller 22, a driven roller 23 driven to the drive roller 22 by a weak spring 28, a detector 24 for detecting the end of the pretensioning process, and a torque motor 25 provided of a motor shaft directly coupled to the drive roller 22 and adapted to rotate in both directions to advance and tension the belt B. The driven roller 23 is rotatably mounted on the top end of a slider 26 adapted to slide vertically along a guide block 27 attached to the pivotable member 7.

During the initial tensioning process, only a low pinch pressure is applied to the belt B by the weak spring 28, so that the torque motor 25 can run under low load and consequently with a high initial acceleration in order to reduce the time 25 required to pre-tension the belt B possible.

The slide 26 receives a strong spring 29 and a roller 49, which roller runs on the cam 21. After the biasing process, the cam 21 pushes the roller 49 up and compresses the strong spring 29 in order to apply the pinch pressure which is applied to advance the belt B by the rollers 30 22 and 23.

A tape guide 50 is disposed between the first clamp 11 and the rollers 22 and 23. The tape guide 50 is hinged to a pin 51 so as to be tiltable in the vertical direction in response to a change in the tension of the tape B which moves through the tape guide 50. The tape tension detector 24 is disposed below the tape guide 50 to be actuated by the vertical tumble movement of the 8403677 24356 / CV / TV tape guide 50. By means of a connection with a weak spring 52, the belt guide 50 is urged to its lowest position of the vertical tumbling movement, i.e. to the position which shows the slack of the belt B.

If the belt B is pretensioned, it will pivot the guide 50 and thereby activate the switch 24 to start the motor 25 in order to subject the belt B to full tension.

Switching of electrical circuits takes place at the end of the biasing process in order to make the torque motor T0 ^ suitable for developing a larger predetermined torque for the full tensioning process. This changeover is at least substantially synchronized with the increase in the nip pressure to be applied to the belt B by the rollers 22 and 23.

As shown in Fig. 6, the electrical circuit 15 for the belt advancement and tensioning mechanism includes a relay contact 56 connected in series with the motor M for driving the camshaft 16, a switch adapted to be actuated and turned off by a cam 53 mounted on the cam shaft 16, a changeover switch adapted to also be turned on and off by a cam 54 mounted on the cam shaft 16. The switch S1, the torque motor 25 and the conversion switch are connected in series. A phase controller 55 for the torque motor 25 is placed between the changeover switch and the torque motor 25. The switch 24 and a relay R are connected in series in a shunt circuit 25 tapped from an intermediate point between the switch S2 and the torque motor 25 *

Current for the torque motor 25 can be changed by the phase controller 55 so that the torque developed by the motor 25 can be controlled. Consequently, the tension to be applied to the belt B 30 by the rollers 22 and 23 in the full tensioning process is determined by the set point in the phase controller 55.

A side piece 30 in the form of a rectangular frame is attached to the bottom surface of the top surface 2. In cooperation with the pivotable member 7, the side piece 30 prevents the belt B 35 from deviating in width direction. As healed in Figure 1, the pivotable member 7 is in its upright position opposite the side piece 30 in such a manner that the end face of the support member 8 8403677 * 8-243535 / CV / tv touches the side piece 30 so that a guide space 31 for placing the leading end of the strap B in the width direction, the bottom surface of the support member 8, the left surface of the pivotable member 7, and the right surface of the side piece 30 may be formed.

When the pivotable member-7 is in the upright position, the upper parts of the first clamp 11, the pressing device 12 and the second clamp 13 protruding from the holder 9 are placed between the side piece 30 and the pivotable member-7.

A tape guide 32 included in the side piece 30 is mounted thereon by means of a shaft 33 in order to be adapted to pivot. By arranging a spring 35, the top end of the tape guide 32 is normally urged to abut against a stop 34 mounted on the side piece 30. When the top end of the tape guide 32 abuts the stop 34, a guide member 36 which is mounted on the tape guide 32 extends into the guide space 31. The top surface of the guide member 36, together with the bottom surface of the support member 8, forms a guide track 37, which defines a vertical region through which the leading end B1 of the tape B is to move in order to be moved exactly the same under the support member 8.

The bottom edge of the guide member 36 has an inclined plane. When the first clamp 11 is moved upwards and collides with the sloping edge 36a (Fig. 5), the guide member 36 is pushed into the side piece 30 so as not to hinder the upward movement of the pressing device 12 and the second clamp 13.

A pivotable lever 38 is provided on the leading end of the tape guide 32. The motor M is energized when the leading end B1 of the tape B is pushed into the guide track 37 to the extent that the pivoting lever 38 is pushed.

This actuation is effected by a switch 39 which is actuated by the lever 38 when it is pivoted.

A hole 40 is provided in the pivotable member 7 in the vicinity of the support member 8 to allow the heater 41 to advance in the guide space 31 through the hole 40 and to retract therefrom.

The base 5 carries a pivotable lever 44. A slide 43, which carries the heater 41, is mounted on the top end 8403677

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* »* -9- 24356 / CV / TV of the hinged lever 44. If pivoting movement is imparted to the lever 44 by the cam mechanism 10, the slide 43 slides on the upper horizontal portion of a guide bar 42, which is attached to the base plate 4, allowing the heater 41 to advance and move back out of the hole 40.

The pivotable member 7 is normally urged to its upright position by applying a spring 45. The heating member 41 is normally urged to advance in the guide space 31 by applying a spring 46. The cam 17 together -10 operation with a roller 47 mounted on the lower portion of the lever 44 communicates pivotal movement to the articulated lever 44.

Thus, in the exemplary embodiment shown in the figures, the cam 17 has a double purpose, namely to communicate an up and down movement of the first clamp 11 and a horizontal movement to the heating member 41. A cam for the first clamp 11 can however, are mounted on the camshaft 16 separately from another cam for the heater 41.

The edge of the cam 20 moves against a roller 48 mounted on the base 5. If the large diameter portion 20 of the cam 20 is on the roller 48, the pivotable member 7 is in an inclined position, as shown in fig. 4.

Unpleasant odors emitted when the belt B is heated by the heating member 41 is removed by a device arranged for this purpose (fig. 7) - This device comprises a housing 58, 25 attached to the bottom surface of the top 2 on the delivery side of the guideway 37 (Fig. 1), a deodorant 59, such as an activated charcoal contained in the middle of three compartments formed by the interior of the housing 58 and an exhaust fan 60 arranged under a compartment 30 61, which is arranged on the delivery side of the middle (deodorant) compartment.

The housing 58 is in the form of a rectangular box with an opening at the top end and is releasably attached to the bottom surface of the top sheet 2 using bolts or the like.

A compartment 62 arranged on the supply side of the middle compartment has an inlet port 63 in the wall opposite the heating member 41.

8403677 9 v * -10- 24356 / CV / TV

A pair of wire nets 64 separate the middle compartment from the compartments 61 and 62. The compartment 61 communicates with the exhaust fan 60 through an exhaust port 65- The bad odor diffusing air is removed from the machine before applying a tape to the packaging, as indicated by arrows in Fig. 7. ·

Prior to actuation, the first clamp 11, the pressing device 12 and the second clamp 13 are in the lower position of their strokes as shown in Fig. 2. The driven roller 23 is spaced from the driving roller 22. The pivotable 10 member 7 is in an upright position as shown in Fig. 1.

During operation, the belt B is pulled out to such an extent that it can be looped around the package A placed on the top 2. Then, the leading end of the belt B is advanced in the guide plate 37. The leading end B1 is allowed to make a straight forward movement in the guide track 37, because the vertical area through which the leading end By is allowed to move is limited (as shown in Fig. 1) through the left surface of the pivotable member 7, the right surface of the side piece 30, the bottom surface of the support member 8, 20 and the top surface of the guide member 36. Correctly positioning in width direction thus, the leading end B ^ with respect to the lower band B ^ passing through the hole 14 provided in the first clamp 11 is accomplished.

If the leading end B ^ pushes against the pivotable lever 38, the switch 39 is actuated by the lever 38 to start the engine M. The camshaft 16 then rotates and the first clamp 11 is raised and pushes the leading end Bj of the strap against the bottom surface of the support member 8, as shown in Fig. 3.

During the upward movement, the first clamp 11 collides with the beveled edge 36a (Fig. 5) of the guide member 36. As a result, the tape guide 32 is pushed into the side piece 30, as shown in Fig. 3.

Then the motor M stops temporarily and the pretensioning process begins, which process is performed by pulling the belt B in Fig. 2 to the right by means of the rollers 22 and 23. During this process the roller 49 is not yet pushed up by the cam 21 and the pinch pressure is applied to the tire B only by the weak spring 28, 8403677 -1 1 - 24356 / CV / tv

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* 9 # '· ® so that the motor 25 can run under low load and consequently with a high initial adjustment.

The biasing process ends when the switch 24 detects that the tension in the band B has reached a predetermined degree of biasing.

Relay R is activated when switch 24 is switched. Then the relay contact 56 closes and the motor M is energized in order to restart rotation of the camshaft 16. Then, the changeover switch is actuated by the cam to energize the motor 25 by the phase control 55.

At the same time, the cam 21 pushes the roller 49 upward and the strong spring 29 is compressed in order to increase the nip pressure applied to the belt B by the rollers 22 and 23. Then the full tension process begins, which process ends when the tension of the band B has reached the predetermined target final tension.

Then, the second clamp 13 is moved upward, and thereby the upper and lower overlapping band portions B1 and B2 of the band B are clamped between the top surface of the second clamp 13 and the bottom surface of the support member 8.

When the pressing device 12 is moved upward, the lower band portion B ^ is cut through the upper left edge of the hole 14 (FIG. 2) and the cut section of the lower band Bg extending from the second clamp 13 to the right is cut. pushed upwards by the pressing device 12.

Simultaneously with the upward movement of the pressing device 12, the cam 17 communicates a horizontal movement to the horizontal heating member 41 in order to insert it between the upper and lower belt parts B1 and B1 through the hole 14 arranged in the pivotable member 7. The pressing device 12 pushes the overlapping portions of the belt B against the bottom surface of the support member 8, thereby holding the heating member 41 between these upper and lower parts B1 and B2. The press establishes a suitable contact between the heating member and the one another overlapping band portions, whereby these band portions are suitably plasticized or melted.

After completing the melting of the belt, the heater is withdrawn from the overlapping portions. After retraction of the heating member, pressing is continued 8403677 -12- 24356 / CV / TV

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v »v V * until the overlapping sections are welded together.

Then, the first clamp 11, the pressing device 12 and the second clamp 13 move down to their initial position and the tape guide 32 is returned to its initial position to allow the guide member 36 to protrude back into the guide space 31 as 5 shown in fig. 1. ·

When the large-diameter portion of the cam 20 runs on the roller 48, the hinged member 47 is inclined in such a direction that it is away from the side piece 30, goals shown in FIG. 4. As a result, the support member 8 moves back 10 from between the package A and the belt B. The motor M then stops.

The motor 25 is started in such a direction that the belt B is advanced. The motor 25 stops when a predetermined length of the belt B has been advanced on the table 1 by the rollers 22 and 23. The driven roller is released from the driving roller 15 22 in order to prepare the belt B to get off the reel 57 (Fig. 7) in preparation for the next bapd application operation.

The machine for applying a tape around a package according to the invention has the following advantages: 1. As a result of a unique construction in which the main parts are arranged on the pivotable member 7, the machine can be made compact, whereby the manufacturing costs can be small. are held.

2. The upper belt portion B1 can be accurately positioned above the lower belt portion because a width deviation is prevented by the opposing surfaces of the pivotable member 7 and the side piece 30.

3. Since the upper band portion can be accurately positioned above the lower band portion B2, both band portions and Bg are bonded together with the largest possible contact area and therefore with the greatest possible bond strength, especially in the case of a narrow band having a width of 6 or 9 millimeters.

35 8403677

Claims (3)

1. Machine for applying a belt around a package provided with a top sheet to which a tape-provided package is applied, a base plate arranged under the top sheet, a main axis supported on the base plate, which extends parallel to the direction in which a belt is advanced, a pivotable member adapted to pivot on the major axis and having a lateral projection on its upper free end to allow an overlapping portion of the belt to be pressed against the bottom surface of the lateral projection, the length of the lateral projection measured in the direction that the path to be traveled by the tire squeezes, at least substantially equal to the width of the tire, two clamps and a pressure member mounted on the pivotable member below the lateral projection and adapted to move up and down in order to press the belt against the bottom surface From the side out nipple, a cam mechanism mounted on the pivotable member below the two clamps and the pressing member for communicating up-and-down movement to the two clamps and the pressing member, a welding member for welding the overlapping parts of the belt, and a side piece secured to the bottom surface of the top sheet having a surface aligned with a longitudinal edge of an elongated opening provided in the top sheet to allow the strip to be pulled therethrough, adjusting the end face of the side projection to touch said surface of the side piece when the pivotal member is in its upright position, thereby forming a guideway through which the tape is inserted. 2. The machine of claim 1, wherein the height of the pivotable member in its upright position is substantially equal to the height of the top blade. Machine according to claim 1 or 2, characterized in that one of the clamps and the pressing member form a cutting member. 8403677 35