CN102771890B - Unit for forming a strip of tobacco in a cigarette making machine - Google Patents

Abstract

A unit for forming a strip of tobacco in a cigarette making machine comprises a conveyor belt (6) looped on at least two rollers (4, 5) one of which is motor-driven; wherein, a lower branch (11) of the belt (6) is a suction branch and extends above a vertical flue (14) in which an ascending air current moves the tobacco fibres (15) from the bottom upwards in such a way that they gradually accumulate along the lower branch (11) forming a continuous layer of tobacco; the unit (1) also comprises a belt (6) tensioner (31) and at least one damper (43) operating in conjunction with the tensioner (31), so as to continuously and gently adjust the tension of the belt (6) to an optimum value.

Description

The unit of strip of tobacco is formed in cigarette machine

Technical field

The present invention relates in cigarette machine the unit forming strip of tobacco.

Background technology

The cigarette machine of the continuous lever of prior art generally includes the vertical channel for being fed to baccy fiber Continuous Flow, and be positioned at the drawing-in type conveyer belt on this passage top, like this, the baccy fiber transmitted by passage little by little precipitates along the lower leg of suction conveyer belt.

Described conveyor belt loop is around two end rollers, and a roller is driven roller, and a roller is driven roller.

In order to tensioning conveyer belt suitably, according to the tensioning level needed for suction conveyer belt, pneumatic linear actuator acts in driven roller.

The continuous tobacco layer that the suction conveyer belt of tensioning will gather along its lower end branch, is transferred to trimming device from the top of passage, in order to form strip of tobacco.

This trimming device is equipped with two desk blades rotated in opposite direction, and desk blade is substantially tangent to each other, and forms such shape, and make tobacco rods with two different thickness, a thickness is greater than another thickness, with constant step alternately.

Then, the strip of tobacco formed by trimming device is fed to release station by suction conveyer belt, and there, strip of tobacco is deposited on continuous print paper web.

Then strip of tobacco and paper web are fed by becoming ellbeam, and paper web is wrapped in around band along this beam and forms continuous print cigarette rod.

Then, cigarette rod device to be cut is divided into other cigarette, and cutter sweep has the blade of rotation, and rotating blade is adjusted to synchronous, cuts off continuous print cigarette rod to make it at the band zone line that thickness is thicker.Like this, obtain the cigarette with compact end, during treatment step thereafter, contribute to the loss preventing tobacco.

At cigarette machine run duration, especially under highest running speed, pneumatic linear actuator can not make the tensioning level of suction conveyer belt keep invariable.

This causes driven roller position unstable, and therefore on suction conveyer belt, occurs vibration.

In addition, in machine operation cycle period, suction conveyer belt becomes wearing and tearing, and its thickness is thinning, and the tensioning level thereupon around roller reduces.After this, pneumatic linear actuator carries out the reduction intervening to compensate the tensioning departing from setting tensioning level.

In all above-mentioned situations, the effect that pneumatic linear actuator compensates tensioning level does not always occur according to desirable progressive mode, there is unexpected and irregular correction every now and then.Correction so produces tensioning cylinder institute and acts on the acceleration of the position of roller and movement out of control, its result, and suction conveyer belt occurs so mobile, is attended by conveyer belt and slides and/or vibrate.

After this, the strip of tobacco that the bottom along suction conveyer belt produces gradually can be shaped in this wise, makes thicker region no longer by constant step separately.Therefore, the step thereafter of cutting continuous lever can not be synchronous with the position in the thicker region of band, thus, is harmful to the Quality and yield of cigarette.

In addition, after above-mentioned vibration occurs, suction conveyer belt bears mechanical stress, and stress can shorten the conveyer belt life-span.

Summary of the invention

Target of the present invention is to provide a kind of unit forming strip of tobacco in cigarette machine, and it can overcome above-mentioned shortcoming.

Especially, target of the present invention is to provide a kind of unit forming strip of tobacco in cigarette machine, wherein, in machine running process, can limit the unexpected movement that the roller be hinged on tensioning cylinder produces.

The technical purpose proposed and the target of regulation are realized by a kind of unit forming strip of tobacco in cigarette machine, and this unit comprises the feature described in independent claims 1.

Accompanying drawing explanation

Now describe the present invention with reference to the accompanying drawings, accompanying drawing shows the preferred embodiments of the present invention, in accompanying drawing:

Fig. 1 is the schematic front view of a cigarette machine part for the unit be equipped with according to formation strip of tobacco of the present invention;

Fig. 2 is the enlarged drawing of details in Fig. 1, wherein cuts some part to demonstrate other part better.

Detailed description of the invention

With reference to Fig. 1 and 2, Reference numeral 1 represents the unit forming strip of tobacco 2, and it is a part for cigarette machine.

Forming unit 1 comprises conveyer 3, and the conveyor belt loop of this conveyer is around at least two rollers 4 and 5, and wherein at least one roller is that motor drives.

Especially, conveyer belt 6 is looped around around driven roller 4 and driven roller 5, and described roller rotates around its oneself axis 4a and 5a respectively.

In the ring formed by conveyer belt 6, have a chamber 7, it is connected to suction source (not shown) by conduit 8.Delimitated by the wall 9 comprising SS 10 in the bottom of chamber 7.

Conveyer belt 6 comprises bottom suction branch 11, for fixing and feeding strip of tobacco 2.Lower leg 11 can contact slidably with wall 9.

Lower leg 11 extends to unloading station 13 from forming station 12.

Forming station 12 comprises the vertical channel 14 be positioned at below lower leg 11.In this passage 14, the air-flow of rising makes baccy fiber 15 move up from bottom, to make baccy fiber little by little gather along the lower leg 11 of conveyer belt 6, forms continuous print tobacco layer.

Forming station 12 also comprises the trimming device 16 being positioned at passage 14 downstream.

The trimming device 16 of known type comprises two dish type cutting members, and they rotate in opposite direction.Fig. 1 only illustrates one in two cutting members, and two cutting members are tangent to each other.The circumference of two cutting members is provided with depression 17 or recess, and they are spaced equal angle.

After trimming device 16 action, strip of tobacco 2 is configured as the extension with two different-thickness, and these two thickness cyclically replace.Especially, the extension 18 that thickness is thicker is results that depression 17 acts on.

Below trimming device 16, known have a collector 19, for collecting the chip tobacco after finishing.The tobacco of recovery is put back in cycle for the treatment of by the retracting device (not shown) of known type.

Conveyer 3 is fed to from forming station 12 strip of tobacco 2 out towards unloading station 13.

At unloading station 13, have the second ring-type conveyer 20, it extends at least in part below the lower leg 11 of conveyer 3.

Second conveyer 20 is looped around around at least two rollers 21 and 22, and comprises the top branch 23 can slided on shelf 24.

The paper web 25 being used for cigarette, paper web unwinding from spool 26 support in the top branch 23 of the second conveyer 20.

Second conveyer 20 is fed to paper web 25 together with strip of tobacco 2, together along known type one-tenth ellbeam from unloading station 13 out, this one-tenth ellbeam schematically illustrates with square 27.

Or rather, ellbeam 27 is become to cause paper web 25 little by little laterally folded around strip of tobacco 2.

Glue sticking device (not shown) in a known manner by the relative longitudinal edge viscose glue of paper web 25 together, and be positioned at feeding place of beam, to form continuous print cigarette rod 28, cigarette rod 28 comprises thicker tobacco extension at thicker extension 18 place.

The control device 39 being positioned at beam 27 downstream checks whether cigarette rod 28 is filled with exactly, if necessary, then does to correct automatically.

Continuous print cigarette rod 28 is laterally cut out segment by the cutting head 29 rotated, and forms other cigarette 30.

Cutting head 29 is synchronous with trimming device 16, to perform each cutting operation in the centerline of each thicker tobacco extension.

Unit 1 also comprises the tensioning apparatus 31 of the conveyer belt 6 for conveyer 3.

This tensioning apparatus 31 is connected at least one in roller 4 and 5, is especially connected to driven roller 5.

As illustrated in fig. 1 and 2, tensioning apparatus 31 comprises fluid dynamic cylinder 31, especially pneumatic linear actuator.

Tensioning apparatus 31 comprises overcoat 32, and piston 33 can slide in overcoat 32, and piston is equipped with the bar 34 extended outside overcoat 32.

In overcoat 32, piston 33 forms the first and second chambers 35 and 36.

First chamber 35 comprises the conduit 37 be fluidly communicated with fluid source, and this fluid source schematically represents with square 38.

Fluid source 38 is connected to adjustment unit (not shown) in a known way, and adjustment unit makes the fluid pressure in chamber 35 keep constant.

At the free end of bar 34, bar 34 comprises eyelet 40, and this eyelet is hinged to the axle of driven roller 5 and coaxial with it.

Pneumatic linear actuator 31 is also equipped with the connector 41 of the wall 42 being fixed on chamber 7.Unit 1 comprises at least one damping element 43, and it operates in conjunction with tensioning apparatus 31.

In the described embodiment, damping element is also hydrodynamics cylinder 43.

In other embodiments, damping element can have different structural schemes, determines according to selected dashpot type.

Hydrodynamics damper cylinder 43 comprises overcoat 44, and piston 45 can slide in overcoat, and this piston is equipped with the bar 46 extended outside overcoat 44.

In overcoat 44, piston 45 forms the first and second chambers 47 and 48.The fluid of these two chambers 47 and 48 containing predetermined viscosity, and by multiple through hole be formed in piston 45, chamber 47 and 48 is communicated with each other.

At the free end of bar 46, bar 46 comprises eyelet 50.Hydrodynamics damped cylinder 43 is also equipped with the connector 51 of the wall 42 being fixed on chamber 7.

Belong to the bar 46 and 34 of damping element 43 and tensioning apparatus 31 respectively, integrally formed with each other by Connection Element 52.

Specifically, Connection Element 52 is fixed to eyelet 50 at one end thereof 53a place, and at its relative 53b place, end, Connection Element 52 is fixed to the intermediate point of bar 34 outside overcoat 32.

At unit 1 run duration, driven roller 5 remains in a certain position by the bar 34 of tensioning apparatus 31, little by little sets this position and predetermined tension force is applied on conveyer belt 6.

Specifically, the adjustment unit of fluid source 38 makes the fluid pressure in chamber 35 keep constant.

In addition, after suction conveyer belt 6 becomes wearing and tearing, tensioning apparatus 31 starts on the direction of arrow F 1 along straight line D, and driven roller 5 is moved to run location accurately, that is caused by the wearing and tearing on conveyer belt 6 with absorption relaxes, and keeps the tension force that conveyer belt 6 is suitable.

If the tensioning compensating action of pneumatic linear actuator 31 occurs with irregular and unexpected interval, then damping element 43 weakens the unexpected movement of driven roller 5 position significantly, and like this, adjustment gradually occurs conveyer belt 6 tension force.

In addition, damping element 43 is connected to driven roller 5 indirectly, and this damping element 43 also weakens any vibration of driven roller 5, and when unit 1 high-speed cruising, can vibrate with higher intensity.

In a unshowned alternative embodiment, tensioning apparatus 31 is along the direct effect at least partially of the conveyer belt 6 of conveyer 3.

Obviously, the invention solves the various problems that prior art runs into.

Advantageously, damping element 43 limits the vibration of driven roller 5 and accelerates and movement out of control, and therefore limit vibration and the movement of conveyer belt 6, at the run duration of unit 1, conveyer belt 6 keeps accurate and controlled run location, to obtain the strip of tobacco 2 with thicker extension 18, this thicker extension 18 is progressively spaced suitably.

Therefore, the cutting of continuous cigarette rods 28 thereafter occurs along the zone line of thicker tobacco extension effectively, therefore, prevents indivedual cigarette from during its post-processing step, losing tobacco.

Finally, damping element 43 absorbs vibration, extends the life-span of conveyer belt 6, because the external stress that conveyer belt bears reduces.

Claims (8)

1. one kind for forming the unit of strip of tobacco in cigarette machine; Described unit comprises the conveyer belt (6) be looped around at least two rollers (4,5), and wherein at least one roller is that motor drives; Described conveyer belt (6) comprises bottom suction branch (11), in order to fixing and feeding strip of tobacco (2), described bottom suction branch (11) extends to unloading station (13) from forming station (12); Described unit (1) comprises tensioning apparatus (31) for conveyer belt described in tensioning (6) and at least one damping element (43), and described damping element operates in conjunction with described tensioning apparatus (31).

2. unit as claimed in claim 1, it is characterized in that, described damping element (43) is connected to described tensioning apparatus (31).

3. unit as claimed in claim 1, it is characterized in that, described damping element (43) is connected at least one in described roller (4,5).

4. unit as claimed in claim 1, it is characterized in that, described tensioning apparatus (31) is connected at least one in described roller (4,5).

5. unit as claimed in claim 1, it is characterized in that, described tensioning apparatus (31) is along the effect at least partially of the conveyer belt (6) for described strip of tobacco (2).

6. the unit according to any one of claim 1-5, is characterized in that, described unit comprises the Connection Element (52) be placed between described tensioning apparatus (31) and described damping element (43).

7. the unit according to any one of claim 1-5, is characterized in that, described tensioning apparatus (31) is hydrodynamics cylinder.

8. the unit according to any one of claim 1-5, is characterized in that, described damping element (43) is hydrodynamics cylinder.