DE3335310A1 - Apparatus for packaging machines for the connection of parts of the wrapping of cigarette packs or other block-shaped articles - Google Patents

Abstract

The invention relates to an apparatus for keeping constant the sealing time or the effective heating capacity in the heat-sealing of the transparent wrappings of cigarette packs, by controlling the angular speed of an actuating means (18) of the sealing tool (2) by control means (20) in such a way that the sealing tool always assumes an effective sealing position constant in time, irrespective of the particular machine speed, in order to prevent a harmful influence or damage as a result of the overheating of the wrapping material during the sealing operation. <IMAGE>

Description

Device for packing machines for connecting

ton parts of the wrapper of cigarette packets or other block-shaped Objects The invention relates to a device for packaging machines for connecting, in particular heat sealing of parts of the wrapping material of cigarette packs or other block-shaped objects, with conveying means for conveying back and forth of the packs to or from a sealing station as well as in a sealing position in cycles heating means moved towards the wrapping material, an actuating means for the heating means, drive means for the actuation means and control means for the drive means.

Such devices are mainly used for welding and sealing of the wrapping parts to be connected, but also only know them for drying of the glued joints in the case of glued connections. With the known packing machines this type is the time in which the heating means for welding, sealing or Drying on the wrapping material of the packs per work cycle for action are brought, hereinafter referred to as the effective heating time, to the nominal speed respectively.

Rated speed of the packing machine matched, d. H. the duration of the heating time is dimensioned so that the parts of the impacts, z. B. the long side lobes or front side lobes of the impacts, flawlessly with one another get connected. Since this is the control of the heating means from the drive of the packaging machine is dependent, means any change in the machine speed or

Speed a change in the work cycle time and thus also the effective one Heating time of the heating means. This would, for example, be the case with a slow start of the machine or when due to disturbances in the supply of to be taken Packs or the like of reduced, for example half the machine speed result in effective heating times that adversely affect the wrapping material and possibly even burn it as a result.

The invention is based on the object of providing devices from the above designated genus in such a way that when the speed changes respectively.

Speed of the packaging machine adversely affect the wrapping material cannot occur.

According to the invention, this object is achieved in that the control means have an actuator which guides the angular speed of the drive means in such a way that that the actuating means the heating means independently of the respective machine speed is always activated in an effective sealing division that is constant over time.

The actuating means is expediently designed as a control cam, the one effective for the sealing position of the heating means, the heating means with constant Has time acting curve section.

An embodiment that can be implemented with relatively little technical effort the invention consists in that the heating means separate, with the control means linked drive means are assigned, the control means the speed of the Drive means are formed leading along a predetermined characteristic curve.

According to an expedient embodiment, the drive means is suitable especially a drive motor designed as a controllable direct current motor, for example in the form of a disc rotor, which because of its relatively low moving masses can be accelerated and decelerated briefly.

In a further advantageous embodiment, the Drive means one connected to the direct current motor via a drive shaft, the heating means acting on the cam, which is expediently transmitted with a brake signal triggering control cam is provided.

As a control means is a further feature of the invention an analog setpoint function generator forming an actuator is provided.

to control the seal during a work cycle are according to a preferred embodiment three signal generators for triggering speed changes of the drive motor is connected to the setpoint function generator. This is what it is is a first signal transmitter assigned to the main drive of the packaging machine to trigger an increase in the speed of the drive motor, a second signal transmitter to trigger a reduction in the speed of the drive motor and a signal transmitter to trigger a speed stop of the drive motor, which is assigned to the cam and depending on the position

whose control cams can be activated.

A particularly preferred embodiment of the invention is thereby characterized in that the drive and control means are one of the main machine drive have a carrier driven to rotate about an axis, on which a coupling is eccentrically is pivotably mounted, on which a guide means mounted eccentrically to the axis attacks with an eccentricity that can be displaced via an adjustable angle of rotation and which itself eccentrically on a rotatable about the same axis and carrying the actuating means The output member engages In this training, mechanical means are used as a function from the respective speed of the main machine drive of the uniform input rotary movement an oscillating pivoting movement is superimposed on the carrier, so that the output member carrying the control cam is accelerated or decelerated. on in this way, the control cam acts with its raised control cam section independently within the work cycle of the machine reserved for the sealing the control roller of the sealing jaw always depends on the respective speed of the machine a constant time. In the context of the invention, it would be possible for the guide means train as a control roller, which in a closed curved path a depending adjustable in different rotary positions of the respective machine speed Control curve would roll off. There is an embodiment preferred according to the invention however, in the fact that the guide means is designed as an eccentric rocker, which on an eccentric pin which forms an actuator and can be rotated by an actuator is stored.

For the transmission of control signals depending on the machine speed the actuator is through according to a further suggestion via a signal transmitter a signal line connected to the main machine drive.

The coupling expediently carries a toothed segment that is inserted into a corresponding one Toothed segment of an output shaft carrying the actuating element for the heating means intervenes.

The advantage achieved by the invention is that each Reduction of the working speed of the packing machine the effective heating time the heating means and thus also the effective heating power in the form of the heating means per working cycle on the packs or their impact in to the extent maintained or kept constant as it is for the nominal speed (Rated speed) is set. This is sure to avoid that when driving the Machine with lower speed than the nominal speed the impact material can burn. The device according to the invention is PEr the entire speed range from zero to nominal speed applicable, with the used control means and drive means according to the invention even at higher speeds represent quickly responding heating medium actuation.

The invention is illustrated below with reference to in the drawing Embodiments explained in more detail.

The following shows: FIG. 1 a basic and block diagram for the inventive Heating means drive, Figure 2 is an enlarged view of part of the control and drive means for the heating means, Figure 3 is a movement diagram of the heating means drive, FIG. 4 shows a longitudinal section through an alternative embodiment of the invention, Figure 5 is a perspective exploded view of the variant according to Figure 4 and FIG. 6 shows a further embodiment of the control and drive means shown in FIG.

The device shown in Figures 1 and 2 for heat sealing the The outer transparent cover of cigarette packs is part of a cigarette packing machine in the form of a cellophane wrapping machine 1 shown in phantom.

The 'device comprises a heating means in the form of a sealing jaw 2, which one in the direction of arrow 3 gradually rotating conveyor in the form of a Revolver 4 is assigned, in its pockets 6 cigarette packs 7 for the purpose of sealing the overlapping edge parts of an outer transparent envelope 8 on the sealing jaw 2 are moved past.

The sealing jaw 2 is on a fixed axis 9 against the Force of a return spring 10 arranged pivotable lever 11, which in the direction of the double arrow 12 can be swiveled up and down, d. H. when the packing machine is at a standstill is moved. To operate the sealing jaw 2 are from the main drive, not shown the cellophane wrapping machine 1 independent drive means 13 provided which one Drive motor in the form of a controllable speed, designed as a disc rotor DC motor 14 include, the drive shaft 16 with the interposition of a Reduction gear 17 carries an actuating means in the form of a cam 18, which, according to FIG. 2, acts on a control roller 19 of the lever 11 of the sealing jaw 2, The cam 18 has a flattened control cam section extending over 1200 A and a raised control cam section B extending over 2400.

In addition, control means 20 are provided to control the sealing cycles, which include the following control elements: To start up the sealing jaw 2, d. H. a start signal is used to trigger an increase in the speed of the direct current motor 14 one of the first signal transmitter 21 assigned to the cellophane wrapping machine 1. For decommissioning the Sealing jaw 2, d. H. to reduce the speed of the direct current motor 14 is used Brake signal of a second signal generator 22, and for triggering a speed stop a stop signal of a third signal generator 25, which in the form of proximity switches the cam 18 are assigned and with a control cam 23 of the cam 18 interact.

The signal generators 21, 22 and 25 are connected to a logic unit 24, in which the signal generators 21, 22 and 25 via logic switching elements (And-, Or-, Not # lieder) are linked together in such a way that a signal pulse of one of the Signal generator 21, 22 and 25 send an output signal to a control member in the form of an analog Setpoint function generator 26 has the consequence, which is pending until another Signal transmitter emits a signal. The analog setpoint function generator 26 is a unit under the type designation POS E2GN from Hauser in Oberschopfheim, Germany, to acquire. Downstream of it is a four-quadrant servo amplifier 27, the essentially from a subtractor 28, a speed controller 29 and a Actuator 31 exists, and as a unit under the type designation SV 3510 of from Hauser in Oberschopfheim, Germany. The DC motor 14 is connected to a tachometer generator 32, both as a unit under the Type designation E 670 MGB can be obtained from Bautz in Darmstadt, Germany. The tachometer generator 32 is connected to the difference generator 28.

In Figure 3, the speed characteristic of the DC motor 14 is shown, where on the abscissa of the coordinate system the time and on the ordinate the Speed is entered.

Operation of the device according to Figures 1 to 3: The cam 18 stands during a conveying cycle of the Revolver 4 for feeding a cigarette pack 7 in the area of the sealing jaw 2 with a zero mark 33 below the proximity switch 22, the center, i.e. H. the strongest flat of the flattened control curve section A is directly opposite the control roller 19, the lever 11 with the sealing jaw 2 is thus in the inoperative position. After completion of a conveying cycle, after a cigarette pack 7 of the sealing jaw 2 is directly opposite, the first signal generator 21 inputs at time to The start signal is sent to the logic unit 24. This sends an output signal to the setpoint function generator 26, which, according to its setting, provides a setpoint for starting the DC motor 14 gives off, namely, as can be seen from Figure 3, for a strongly accelerated Starting the DC motor 14 to the preset nominal speed. The real one The four-quadrant servo amplifier is used to control and regulate the speed of the DC motor 14 27 causes. The rotary movement of the DC motor 14 is via the reduction gear 17 transferred to the cam 18. The cam 18 acts with the based on its direction of rotation (arrow 34) effective rising branch a1 of the flattened Cam section A, the control roller 19, so that the lever 11 with the sealing jaw 2 is pivoted against the cigarette pack 7 standing by. At the time tl the DC motor 14 has reached its rated speed, the cam 18 after an angle of rotation of 600 with its raised control curve section B die Control roller 19 is applied to the extent that the sealing jaw 2 is in its operative position is brought to the plant on the cigarette pack 7 to be sealed. With the preset The nominal speed of the direct current motor 14 results over an angle of rotation range of 2400, during which the cam 18 with its raised control cam section B the tax roll 19 applied, an effective sealing time between times t1 and t2, which are independent of the respective speed the cellophane wrapping machine 1 is kept constant during the sealing cycles. At the time t2, the control cam 23 of the cam 18 passes the proximity switch 22, which sends a signal to the logic unit 24, which in turn sends a signal to the setpoint function generator 26 outputs a brake signal for a lower motor speed of the DC motor 14. According to its setting, the setpoint function generator controls 26 according to the diagram The speed of the direct current motor 14 via the four-quadrant servo amplifier 27 down, the sloping branch a2 of the flattened control curve section A the Control roller 19 happens so that the lever 11 with the sealing jaw 2 during the phase the speed reduction of the DC motor 14 by the return spring 10 of the cigarette pack 7 is pivoted away. At time t3, the DC motor 14 only has a relatively low speed, the control cam 23 reaches the Proximity initiator 25, which emits a stop signal to logic unit 24.

The output from the logic unit 24 to the setpoint function generator 26 The signal for a speed stop is converted from this into a corresponding control signal converted to the four-quadrant servo amplifier 27, from which the DC motor 14 is stopped from its low speed. With this measure, namely before the actual engine stop, its speed is considerable to reduce, the DC motor 14 of the proximity switch 25 can be be stopped exactly that at the end of a work cycle or sealing cycle the zero mark 33 of the cam 18 is always the same starting position for the next work cycle occupies.

With the setpoint function generator 26, which is to be issued with regard to its Setpoints can be set, one can be used for the respective conditions optimal speed characteristic given and by means of the four-quadrant servo amplifier 27 must also be adhered to 0 After a completed sealing cycle follows for the sealing device a rest time between times t3 and t4 according to the diagram, during which a The conveying cycle for bringing in a new cigarette pack 7 to be sealed takes place. At time t4, a new, previously described sealing cycle is initiated.

The alternative embodiment shown in Figures 4 and 5 of The invention is constructed as follows: In a housing 136 are a drive shaft 137, which can be driven by the main machine drive 138, and one parallel to this arranged output shaft 139 rotatably mounted. The output shaft 139 is the axis for a carrier 141, which is firmly connected to a gear 142, which with a gear 143 mounted on the drive shaft 137 meshes. Into the carrier 141 a bearing pin 146 is embedded for eccentric mounting of a coupling 144, which engages in a needle bearing 147 of the coupling 144. The belt 144 carries in one Recess 148 a rest of the toothed segment 149 screwed to the coupling 144, which into a corresponding toothed segment 151 fixedly arranged on the output shaft 139 intervenes. The opposite end of the output shaft extending out of the housing 136 139 carries an actuating means in the form of a cam 152, which the control roller 119 of the lever 111 carrying the sealing jaw is applied.

The coupling 144 has a further needle bearing 153, in which a Pin 154 of a guide means in the form of an eccentric rocker 156 engages. the Eccentric rocker 156 is eccentric to the axis of the by means of a ball bearing 157 Output shaft 139 or an equiaxed actuator on an actuator forming eccentric pin 159 of the actuating shaft 158 is supported. The actuating shaft 158 wearing a ring gear 161 in which a pinion 162 of a servomotor 163 engages, the is flanged to the housing 136.

The servomotor 163 is connected to the main machine drive via control means 164 138 linked. The control means 164 point to the determination of the respective operating speed of the main machine drive 138 a tachometer generator lying on a signal line 166 167, which is linked to the input of a potentiometer 168, its Output is in turn connected to a comparison element 169. The comparison link 169 is also the respective angular position of the from an actual value transmitter 171 Eccentric pin 159 indicating actual value signal can be supplied. The output of the comparator 169 is connected to the servomotor 163 via an amplifier 172.

The operation of the sealing jaw drive is as follows: From the main machine drive 138 becomes the drive shaft 137 and, via the gears 143 and 142, the carrier 141 driven at a uniform angular speed. About the bearing pin 146 is the coupling 144 taken along in the same direction of rotation, the rotational movement being about the toothing of the toothed segments 149 and 151 also on the output shaft 139 is transmitted.

The coupling 144 drives at the same time via the needle bearing 153 engaging pin 154 the eccentric rocker 156 in the direction of rotation. Dependent on of the respective position of the eccentric pin carrying the eccentric rocker 156 159 the eccentric rocker 156 is accelerated and decelerated during one revolution, these accelerations and decelerations as an additional oscillating pivoting movement transmitted via the pin 154 to the coupling 144 or the uniform rotary movement the coupling 144 are superimposed. This superimposed Swivel movement is in turn caused by a corresponding relative movement between the tooth segments149 and 151 from the coupling 144 to the output shaft 139 carrying the control cam 152 transfer. In this way, the control cam 152 becomes dependent during one revolution accelerated by the respective speed of the main machine drive 138 or delayed that the raised sealing jaw holding the sealing jaw in its operative position Control curve section B always even at different machine speeds is used in an actuation phase that is constant over time.

Whenever the speed of the main machine drive 138 changes A corresponding signal is sent from the tachometer generator 167 to the potentiometer 168, its output signal with that of the respective angular position of the actuating shaft 158 and thus the actual value signal dependent on the respective position of the eccentric pin 159 of the actual value encoder 171 is compared. In this way in comparison element 169 The difference signal formed triggers a corresponding adjusting movement via the amplifier 172 of the servomotor 163 and thus a different angular position of the eccentric pin 159 the end. This is the acceleration and deceleration phases of the eccentric rocker 156 so shifted in adaptation to the changed speed of the main machine drive 138, that in coordination with the conveyor cycles and standstill cycles of the machine in which The latter the sealing takes place, the effective raised control cam section B of the Control cam 152 acts on control roller 119 in good time, a constant time acts on this and is moved away again from the control roller 119 in good time. The respective desired sealing time can be set on the potentiometer 168.

In the variant shown in Figure 6, parts are similar to those of Figure 2 correspond, provided with reference numbers increased by 200 and not again Specifically described, in contrast to FIG. 2, is the one carrying the sealing jaw 202 Lever mounted centrally on the axis 209, while the acted upon by the cam 218 Control roller 219 is arranged at its end, the pressing of the sealing jaw 202 by the spring 210 and the lifting by the cam 218 takes place. to for this purpose, the cam 218 is used to place the sealing jaw 202 on enabling control cam section B and with two control cam sections lifting the sealing jaw A, A 'provided. In addition, the cam has two control cams 223, 223 ', each with a signal transmitter 222 resp.

222 'cooperate for the purpose of triggering a brake signal and the two also cooperate with the signal generator 225 to trigger a stop signal.

For executing a sealing cycle (placing and lifting of the sealing jaw) the cam is advanced clockwise by 2700 and for the following Seal moved back counterclockwise at a rate of 2700 (double arrow 273).

To avoid damage caused by overheating of the wrapping material of the The cam disc is used to prevent packs when the machine is at a longer standstill 218 provided with a clearly protruding cam 274, which in the event of a stop signal of the machine is applied to the control roller 219 by a signal from one of the signal generators and the sealing jaw 202 much further than in normal operation of the cigarette pack 207 takes off.

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Claims (18)

P a t e n t a n s p r ü c h e 1.) Device for packing machines for Joining, in particular heat sealing, of parts of the wrapping material of cigarette packs or other block-shaped objects, with conveying means for conveying back and forth the pack to or from a sealing station as well as in a winning division Cyclically move heating means, an actuating means, to the wrapping material for the heating means, drive means for the actuation means and control means for the drive means, characterized in that the control means (20; 164) a the angular speed of the drive means (13; 144) thus guiding actuator (31; 159) have that the actuating means (18; 152) the heating means (2) independently of the respective machine speed always in a time-constant effective Holding the seal position is activated. 2. Apparatus according to claim 1, characterized in that the actuating means is designed as a control cam (18; 152), the one for the sealing position of the Heating means (2) effective curve section beating the heating means with constant time (B). 3. Device according to claim 1 and / or claim 2, characterized in that that the heating means (2) separate drive means linked to the control means (20) (13) are assigned, wherein the control means the speed of the drive means along are designed to lead a predetermined characteristic. 4. Device according to one or more of claims 1 to 3, characterized characterized in that the drive means (13) are a controllable direct current motor (14) include trained drive motor. 5. Device according to one or more of claims 1 to 4, characterized characterized in that the drive means (13) have a drive shaft (16) with the direct current motor (14) connected to the heating means (2) acting cam (18) have. 6. Apparatus according to claim 5, characterized in that the cam (18) is provided with a control cam (23) which triggers a brake signal. 7. Device according to one or more of claims 1 to 6, characterized characterized in that the control means (20) have an analog setpoint function generator (26) include. 8. Device according to one or more of claims 1 to 7, characterized characterized in that three signal transmitters (21, 22, 25) for triggering speed changes of the drive motor (14) are connected to the setpoint function generator (26). 9. Apparatus according to claim 8, characterized in that a first Signal generator (21) for triggering an increase in the speed of the drive motor (14) The main drive of the packing machine (1) is assigned. 10. Apparatus according to claim 8, characterized in that a second Signal generator (22) to trigger a reduction in the speed of the drive motor (14) assigned to the cam disk (18) and depending on the position of this or whose control cam (23) can be activated. 11. The device according to claim 8, characterized in that a third Signal generator (25) for triggering a speed stop of the drive motor (14) of the cam (18) assigned and depending on the position of this or its control cam (23) can be activated. 12. The device according to claim 10 and / or 11, characterized in that that the third signal transmitter (25) is assigned to the turntable disc (18) in such a way that it is activated after activating the second signal generator (22). 13. The device according to claim 1 and / or 2, characterized in that that the drive and control means one of the main machine drive (138) by one Axis (139) having rotatably driven carrier (141) on which an eccentric coupling (144) is pivotably mounted, on which an eccentric to the axis mounted Guide means (156) with an eccentricity that can be displaced via an adjustable angle of rotation attacks and which itself eccentrically to a rotatable about the same axis, the actuating means (152) engages bearing output member (139). 14. Apparatus according to claim 13, characterized in that the Guide means is designed as an eccentric rocker (156) which is attached to a Eccentric pin forming the actuator and rotatable by an actuator (163) (159) is stored. 15. Apparatus according to claim 13 and / or 14, characterized in that that the actuator (163) for the transmission of control signals as a function of the machine speed via a signal transmitter (168) through a signal line (166) is connected to the main machine drive (138). 16. Device according to one or more of claims 13 to 15, characterized in that the coupling (144) carries a toothed segment (149) which is in a tooth segment (151) one the actuating element (152) for the The output shaft (139) carrying the heating means (2) engages. 17. Device according to one of claims 1 to 5, characterized in that that the cam (218) can be moved back and forth for successive sealing cycles and a curve section (B) which triggers the application of the sealing jaw (202), two cam sections (A, A ') lifting the sealing jaw and two control cams (223, 223 '), which have two signal transmitters (222 #, 222') for triggering a speed reduction and a signal transmitter (225) are assigned to trigger a speed stop. 18. The device according to claim 17, characterized in that the Cam disk (218) with one that lifts the sealing jaw (202) when the machine is at a standstill Standstill cam (274) is provided.