Background technology
Automatic labeling machine is a kind of manufacturing line that is used for, and product (commodity) is sticked automatically the equipment of sign (trade mark).
One, the structure of automatic labeling machine and principle of work:
Automatic labeling machine mostly is made of following components (parts) both at home and abroad at present: referring to Fig. 1.
1-marks storehouse (unreeling structure):
The mark storehouse of automatic labeling machine is the device that is used to store marker tape and unwinding tension is provided for tape roll.Labelling machine uses the dish type marker tape, and marker tape as shown in Figure 2.The matrix of marker tape is the antiseized paper tape of strip shape, the attached non-drying glue sign (trade mark) that wears on it.Use for ease of automatic labeling machine, marker tape all coils rolling (dish), pan of a steelyard shape marker tape again.Get loose voluntarily from the marker tape dish for preventing that marker tape is in operation, generally be provided with the mechanism that utilizes spring force or friction, marker tape is tightened up, to produce so-called unwinding tension.
2-dancing bar:
The dancing bar is the response agency of labelling machine unwinding tension.Labelling machine is in operation, owing under the effect of the tractive force that paper-feeding mechanism (marker tape trailer coupling) is produced, marker tape is involved in the marker tape dish, because the marker tape dish has certain inertia, so in case spur marker tape, because inertia has long marker tape and gets loose in the marker tape dish, at this moment, unwinding tension disappears, but under the effect of the spring force of dancing bar, can make marker tape tensioning again again, the marker tape unwinding tension recovers.
3-marker tape braking force mechanism:
This system of mechanism has a guide pulley and an elastic pressuring plate to constitute, and marker tape passes through between cylinder and the compressing tablet, and the pressure of compressing tablet is regulated by spring.The pressure difference, marker tape is suffered that friction force is also just different, and this friction force also is the part of marker tape tension force.
4-decals head and stripping plate:
The decals head of labelling machine is the parts of labelling machine near affixed object, the decals head the stripping plate is housed foremost, its function is with sign (trade mark), under the effect of marker tape tension force, peels off out and transfers on the affixed object (commodity) from marker tape.
5-identifies photocell eye:
The sign photocell eye is the motion that is used to detect marker tape, and after marker tape has moved a step pitch (L) (referring to Fig. 2), it just sends instruction stops the marker tape conveying mechanism immediately, to guarantee only to paste a sign (trade mark) on each affixed object.
6-marker tape conveying mechanism (or claiming the marker tape trailer coupling):
The motion of marker tape in labelling machine is to be realized by the tractive force that paper-feeding mechanism (marker tape trailer coupling) is produced.One piece of sign of every subsides (trade mark), paper-feeding mechanism just make marker tape move a step pitch (L) (referring to Fig. 2).
The 7-rolling-up mechanism:
After sign on the marker tape (trade mark) was attached on the affixed object (commodity), marker tape just became the blank base stock that does not have sign (trade mark), and rolling-up mechanism just winds up its collection.
8-is support fixedly;
Be used for fixing various parts.
9-marker tape transition roller;
Marker tape in the process of walking, to the change of marker tape direction of travel.
The 11-marker tape.
Affixed object (goods or commodity) detector:
It is the external device (ED) of labelling machine, is used to detect affixed object.In manufacturing line, when affixed object arrives the desired location, just instruct automatic labeling machine that it is sticked sign (trade mark).The affixed object detector can be an electromechanical detector, also photoelectric detector.
Two, the job analysis of automatic labeling machine:
1, the working process of automatic labeling machine:
In the manufacturing line of operation, when the affixed object detector finds that affixed object (commodity) arrives preposition, it just orders the marker tape conveying mechanism to start immediately, the motion of traction marker tape, marker tape is during through the front end of the stripping plate on the decals head, and the sign on the marker tape (trade mark) is just peeled off out and changeed and be attached on the affixed object from marker tape.When marker tape had been walked a step pitch (L) (referring to Fig. 2), the sign photocell eye stopped with regard to immediate command marker tape conveying mechanism.This has just finished the automatic poster process of a sign (trade mark).When the affixed object on the manufacturing line was sent here continually, automatic labeling machine just constantly sticked sign (trade mark) to each affixed object; Sign (trade mark) also just constantly transports out from the mark storehouse of labelling machine with marker tape, the concise and to the point working process of Here it is automatic labeling machine.
2, the dynamics analysis of automatic labeling machine working process:
From above-mentioned introduction as can be known, the work of automatic labeling machine has following feature:
A, automatic labeling machine be always with gap mode work, the process that one piece of sign of every subsides (trade mark) all have startup, stop.
B, because its mode of operation is frequent startup, stopped process, therefore, the tension force in the marker tape just always is among the rapid variation.
Analyze the Changing Pattern of the tension force in the marker tape. when labelling machine begins poster process, at first be to start the marker tape conveying mechanism, the pulling marker tape, marker tape dish in the mark storehouse is subjected to the effect of pulling force and will rotates, because the inertia of marker tape dish is bigger, its marker tape length of sending can be much larger than a step pitch (L) (see figure 2), can make the marker tape of CDEF section be in relaxed state fully, the tension force that is this segment mark band just changes to zero tension force (lax fully) once by the required tension force (unwinding tension) of pulling marker tape dish, because marker tape has relaxed, the dancing bar can be swung to counterclockwise under the effect of torque spring power, again marker tape is strained, therefore, tension force in this segment mark band is to be in the steep variation, change to zero from unwinding tension suddenly, progressively return to the unwinding tension of former setting again. also have, produce the device of mark storehouse unwinding tension, all be to adopt a torque spring, its moment of torsion is by artificial setting, in the whole service process definite value. still, in the labelling machine operational process, because sign (trade mark) constantly is attached to affixed object and gets on, the diameter of tape roll is constantly to reduce, along with reducing of diameter, unwinding tension just constantly increases (because of the torsional moment of spring is a definite value), therefore, itself also changes unwinding tension, be not constant. again because after marker tape is lax, the dancing bar is under the effect of torque spring, progressively recover unwinding tension, but in this process, dancing pole pair marker tape also has the effect of impulsive force, just make the tension variation situation more complicated. more trouble is, mentioned strain changes, the process of adjusting can not be synchronous with the beat of labelling machine decals, particularly in the process of high speed decals, the decals speed of general automatic labeling machine can both reach the level of per minute hundreds of piece, be that the decals cycle is very short. but because the mark storehouse, the inertia of tape roll and dancing bar is bigger, the cycle of its tension adjustment is much larger than the decals cycle, therefore, at each decals in the cycle, the Changing Pattern of tension force is all different in the marker tape. marker tape tension change law non-constant, after just causing having pasted a mark, the sign (trade mark) that next preparation is pasted stops the stripping front edge of board of decals head, holding fix difference (refer to do not have repeatability) makes decals position instability. also promptly is difficult to sign (trade mark) accurately is affixed on the affixed object appointed positions. and the major cause of the current various labelling machine decals positional precisions of influence that Here it is.
Further analyze of the influence of marker tape tension force to the decals position.Investigate the tension force in the ABC segment mark band again, the tension force in the ABC section is made up of two parts, the tension force of first CDEF section, and it two is friction force that pressure produced of damping leaf.Know from top analysis, the tension change law of CDEF section all is different in the cycle at each decals, and the friction force that damping leaf produces, because spring leaf pressure is constant when labelling machine is worked, the friction force of its generation also is constant, so just constant at the Changing Pattern of each decals in the cycle by the tension force of its generation.Therefore, tension force is caused by CDEF segment mark belt tension Changing Pattern difference in the difference of the Changing Pattern of each decals in the cycle in the ABC segment mark band.After tension change law difference in the ABC section will cause a sign (trade mark) to paste, the sign (trade mark) that next preparation is pasted produced deviation (error) in the position that the front end of decals head stripping plate stops, waiting for, and this will cause decals position generation error.Must analyze as can be known from above, the tension change law in the ABC segment mark band is in the difference of each decals in the cycle, be owing to the tension change law in the CDEF segment mark band each decals all different causing in the cycle.Therefore, in order to improve the decals positional precision of labelling machine, will make the marker tape tension force in the CDEF section all identical at the Changing Pattern of each decals in the cycle, these are in existing all automatic labeling machines both at home and abroad, because physical construction all can't be accomplished.
Summary of the invention
The purpose of this invention is to provide a kind of automatic labeling machine with constant tension mechanism, can be before decals at the marker tape of labelling machine, make marker tape tension force all identical, to overcome the not high defective of decals positional precision of labelling machine in the prior art at the Changing Pattern of each decals in the cycle.
In order to realize above-mentioned order, the present invention includes the mark storehouse, the dancing bar, marker tape braking force mechanism, decals head and stripping plate, the sign photocell eye, the marker tape conveying mechanism, rolling-up mechanism and marker tape transition roller, the mark storehouse, marker tape braking force mechanism, rolling-up mechanism and marker tape transition roller are arranged on one fixedly on the support, the dancing bar is arranged on the mark storehouse, marker tape places the mark storehouse, marker tape is according to the mark storehouse, the first marker tape transition roller, the dancing bar, the second marker tape transition roller, the 3rd marker tape transition roller, the 4th marker tape transition roller, marker tape conveying mechanism, the order walking of rolling-up mechanism, the second marker tape transition roller is arranged on the end of dancing bar, marker tape braking force mechanism is arranged on the 3rd marker tape transition roller, is characterized in: be provided with a marker tape constant tension mechanism between the second marker tape transition roller and the 3rd marker tape transition roller, the marker tape constant tension mechanism is fixed on fixedly on the support, marker tape enters constant tension mechanism by the second marker tape transition roller, and constant tension mechanism is exported marker tape to the three marker tape transition rollers of permanent tension force.
Described marker tape constant tension mechanism comprises the roller and the pressure roller that is arranged on the roller by stepping motor or driven by servomotor, marker tape enters constant tension mechanism by the second marker tape transition roller from the lower end of roller, and marker tape is from exporting the 3rd marker tape transition roller between roller and the pressure roller.
The present invention makes the present invention can be applied on all automatic labeling machines owing to adopted constant tension mechanism, can improve the precision of its decals position greatly, has solved the accurate inadequately difficult point in current labelling machine decals position.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is provided with a marker tape constant tension mechanism 10 between the second marker tape transition roller 9.2 of automatic labeling machine and the 3rd marker tape transition roller 9.3, promptly on automatic labeling machine, add a constant tension mechanism 10 (Fig. 3) in the CD section of marker tape, constant tension mechanism is divided into the ABCDEF section three sections with differential tension variation characteristic, be C ' DEF section, CC ' section and ABC section.Wherein, the Changing Pattern of the tension force in the C ' DEF section and similar (promptly similar) described in the background technology to tension change law in the CDEF section among Fig. 1, because the introducing of constant tension mechanism 10, when marker tape is installed, can make CC ' be in relaxed state, even always the tension force of CC ' section is zero (zero tension force also is a kind of constant-tension).At this moment, tension force in the ABC section is just determined by the friction force that spring pressure produced of marker tape braking force mechanism (brake strip) 3 fully, the spring pressure of brake strip 3 all is the same in the cycle at each decals, therefore the tension change law in the ABC section also is the same in each decals cycle, this just makes sign (trade mark) that each preparation pastes identical in the position that stripping plate 4 front ends of decals head stop, waiting for, this has just greatly reduced the error of decals position, has greatly improved the decals positional precision of automatic labeling machine.
In order to make the constant tension in the CC ' segment mark band is zero, and this just requires this mechanism will guarantee to satisfy following condition when control:
The linear velocity V ' of A, constant tension mechanism 10 to equal or be slightly larger than marker tape rolling-up mechanism 7 linear velocity V (V ' 〉=V);
The marker tape length that B, constant tension mechanism 10 are carried in each decals cycle traction is wanted strict marker tape traction delivered length, the i.e. step pitch of marker tape (L) that equals the marker tape trailer coupling.
As long as the constant tension mechanism of being controlled satisfies above-mentioned condition (such condition is not difficult to realize), just the marker tape of CC ' section always is in zero tension state (also being a kind of constant-tension), the tension force of ABC segment mark band just is not subjected to the influence of C ' DEF section so, the tension change law of ABC section is all identical in the cycle at all decals, thereby the sign (trade mark) that makes each preparation paste is also just identical at the holding fix of stripping front edge of board, it is identical that this will make that sign (trade mark) is attached to the position of affixed object, also improved the precision of decals position greatly.
Embodiment:
The mechanical construction drawing of constant tension mechanism 10 is as shown in Figure 4. and its core texture is made of roller 101 and pressure roller 102. and roller 101 is driving wheel, it drives input shaft 107 can be by stepping motor or driven by servomotor. the linear velocity V ' that determines roller 101 according to the optimal drive rotating speed and roller 101 diameters of motor, require this linear velocity to equal during control or be slightly larger than the linear velocity V of the marker tape rolling-up mechanism 7 of labelling machine, be V ' 〉=V, the stepping motor of driving rolls 101 or the step-length of servomotor are identical with the step-length of stepping motor that drives marker tape rolling-up mechanism 7 or servomotor, the surface that its step-length is the roller 101 of marker tape step pitch L. constant tension mechanism 10 is adhesive with one deck emery powdor (or embossed surface with high-strength epoxy, or other improves the measure of roughness of surface), to improve the friction coefficient on roller 101 surfaces, to prevent that marker tape 11 from skidding, under the cooperation of pressure roller 102, reach accurate delivery precision, roller 101 starts simultaneously with the marker tape rolling-up mechanism 7 of labelling machine, the surface that each marker tape length of carrying also is a step pitch L. pressure roller 102 is surrounded by silaatic (its hardness is about Shao Shi A 60-70), and pressure roller 102 presses on roller 101 under the spring force effect of press rods 105.Cam 104 and handle 108 are provided with for the marker tape convenient mounting and clamping.During handle 108 Rotate 180s °, cam 104 just lifts pressure roller 102 by the cam platform that cam below is provided with, and then can easily marker tape 11 be sandwiched between roller 101 and the pressure roller 102, install marker tape 11 after, with handle 108 Rotate 180s °, pressure roller 102 is pressed in again on the roller 101 again.
The content that is not described in detail in this specification sheets belongs to professional and technical personnel's known prior art in this area.