CA2069391A1 - Apparatus for cutting profile strips formed of rubber - Google Patents
Apparatus for cutting profile strips formed of rubberInfo
- Publication number
- CA2069391A1 CA2069391A1 CA002069391A CA2069391A CA2069391A1 CA 2069391 A1 CA2069391 A1 CA 2069391A1 CA 002069391 A CA002069391 A CA 002069391A CA 2069391 A CA2069391 A CA 2069391A CA 2069391 A1 CA2069391 A1 CA 2069391A1
- Authority
- CA
- Canada
- Prior art keywords
- knife
- shaft
- transverse
- motor
- cutting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/003—Cutting work characterised by the nature of the cut made; Apparatus therefor specially adapted for cutting rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
- B29D30/46—Cutting textile inserts to required shape
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Textile Engineering (AREA)
- Tyre Moulding (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Nonmetal Cutting Devices (AREA)
Abstract
APPARATUS FOR CUTTING PROFILE STRIPS
FORMED OF RUBBER MIXTURES
ABSTRACT OF THE DISCLOSURE:
Apparatus for cutting profile strips of rubber mixture produced by extrusion and/or calendering and transported to the cutting apparatus by a conveyor which is intermittently stopped for making a cut has a motor driven rotating knife which is moved transversely of the profile strip by a roll-ring drive and is raised to a height above the profile strip for return movement of the knife. In one embodiment, the knife, its driving motor, and the mechanism for moving the knife transversely of the profile strip are mounted on a seesaw which is pivoted on horizontal axis and is moved pivotally by a pneumatic servo-motor to raise and lower the knife. In other embodiments the knife and transverse movement mechanism are mounted on a movable carriage, which is raised and lowered by a pneumatic servo motor while the motor for driving the knife in rotation is mounted on the frame of the apparatus and connected to the shaft of the knife by a flexible or telescopic connecting shaft. The carriage runs on a track or is supported by a parallelogram linkage.
b:WSS/6020-4/abstract/May 21.92/sm w:201
FORMED OF RUBBER MIXTURES
ABSTRACT OF THE DISCLOSURE:
Apparatus for cutting profile strips of rubber mixture produced by extrusion and/or calendering and transported to the cutting apparatus by a conveyor which is intermittently stopped for making a cut has a motor driven rotating knife which is moved transversely of the profile strip by a roll-ring drive and is raised to a height above the profile strip for return movement of the knife. In one embodiment, the knife, its driving motor, and the mechanism for moving the knife transversely of the profile strip are mounted on a seesaw which is pivoted on horizontal axis and is moved pivotally by a pneumatic servo-motor to raise and lower the knife. In other embodiments the knife and transverse movement mechanism are mounted on a movable carriage, which is raised and lowered by a pneumatic servo motor while the motor for driving the knife in rotation is mounted on the frame of the apparatus and connected to the shaft of the knife by a flexible or telescopic connecting shaft. The carriage runs on a track or is supported by a parallelogram linkage.
b:WSS/6020-4/abstract/May 21.92/sm w:201
Description
3 ~ :~
~PP~RATU~; ~O~ CUTTl NG PROF~T~ IP~
~ORM~:n 0~ RITI~F~R M I~TIJRT~
FIELD OF THE INVENTION
This invention relates to apparatus for cutting into sections a profile strip of a rubber mixture which is formed by extrusion and/or calandering and which is transported by a conveyor which is intermittently stopped for th~ cuttin~ operation. The apparatus comprises a knife in the form of a ~ir~ r ~ 3k which is mounted on a knife shaft and driven by a motor th~ou~h a flexible sha~t and a transverse motion mechanism for moving the knife back and forth between two predetermined end positions and for raising the knife to a higher position during the return stroke than during the cutting stroke.
.R~R~ROUND OF THEINVENTION:
In the production of single and multiple layer rubber strips for the ~nanufacture of tires, for example protector or tire sidewall profiles, not onlyhi~h quality but also high frequency of cuts per unit time must be obtained in or~l~r t~ maet the proeluction requirements of tire production. The cut ~u~lity i~ o pPtrl~icular impo~tanc:e in the production of radial tires and the~ut ~ uancy is necessary in order to obtain economical production.
~ utting app~ratus according to the state of the art, almost without axcapti~n, uses a fast rotating circular knife which during the cut must be lubri~ated with steam or by a liquid vapor. There are embodiments in which the circular knife is mounted dir-ectly on the shaft of the driving motor which then must be moved with the knife and protection devices transversely of the proiile strip. In order to malce a cut on a moving profile strip, such cutting machine had a carriage which through coupling to the transport device 2~3~i during the cutting operation moved synchronously with the rubber profile strip to be cut. With higher production rates, this cutting apparatus soon became inoperable because the return movement of the carriage with the cutting apparatus could not be accomplished in the short time period.
The further development of the cutting apparatus was to the effect that the rubber strip to be cut would be stopped for a short period of time for the cutting operation, which required braking and accelerating mechanism for th~ transport element and raised serious problems of precision which, h~w~v~!r, coukl be solved. However, it showed the limits of performance in th~ transverse movement of the rotating cutting knife, since because of the r~latively great mass, in particular of the knife motor, the speed of movement could not be as high as required for efficient operation, in particular the required cutting frequency desired for the extrusion apparatus. However, not only the weight of the driving motor for the knife set limits on increase in spee~l of production, but also the transport mechanism, for the most part ~o~ g screw spindles, which were driven by brake motors and which, on account of the fre~uent acceleration and braking, were subject to serious ~b~a3i~n~ The starting and braking operations of the transverse movement lve~l s~rong forces which affect the entire CUttùlg machine and are not ~ndur~
It has be~n sought to carry out the cutting operation in both cti~n~ by mak~ng one cut from left to right and the next cut from right t~ le~t~ HOWeVeL', this gave dissimilar cut pictures which led to problems in the packagiilg of tires. It is, hence necessary, in the return movement of the knife, to raise the knife together with the knife holder over the profile strip to be cut at the end of a cut, then draw it back over the profile strip and then for carrying out the next cut, again lower the knife as is described for ~xample in DE-PS 11 86 209.
h ~
The apparatus know through this publication has, as the cross feed mechanism, a carriage which is displaceable on guide rails and is shoved back and forth by a chain between two guide wheels. The carriage has a cradle with bearings for the knife shaft. The movement of the cradle is derived ~rom a roc~cer arm which is linked to the chain and the carriage and which transmits the chain movement to the carriage. On account of the inexact cradte hei~ht acljustment there are additionally provided pivot adjustments.
~ha driving Inotor is connected with the knife shaft by a flexible shaft. With thi3 ~rr~ln~ement an exact cut is not possible~ The non-uniformities which occu~ lie in somewhat like positions and hence largely compensate one another but this is not sufficient for modern requirements of tire quality.
The use of pneumatic thrust cylinders instead of threaded spindles l~ads to an almost abrasion free method of operation but does not achieve the desired result, since, because of the short time of the entire operation, the thr~l~3t of acc~leration and braking cannot be sufficiently damped. Moreover, ~h~a pn~umatic transport devices have the objection that they cannot be brought to a uniform transverse velocity during the cut, since at the m~m~nt cf cutting, the resistance-responsive forward velocity is decreas~d.
Th~ 1~ to un~lean cuts~ ~ydraulic drives for the transverse movement of tha k~i~ ar~ prohibitecl, not only by reason of cost, but also because of the h~ thru~t which occurs with hydraulic mechanism in fast acceleration and ki~
SUHM~RY OF T~E INVENTION:
The present invention avoids the disadvantages of the state of the art.
It is the object of the invention to increase in a simple manner, the speed of operation of the cutting apparatus in making precise cuts.
The cutting apparatus in accordance with the invention attalns these objectives by providing apparatus in which the knife shaft, its bearings and the transverse movement mechanism are arranged on a common displaceable or swingable mounted support, the transverse movement mechanism is a roll-ring drive, the drive shaft for the transverse movement mechanism is rotatable in bearings fast on the mounting support, the knife shaft is rotatable but not axially slidable in or on a bearing housing mounted on the housing of the tran~varse movement mechanism and between the knife shaft and the shaft of th~ motor ~or driving the linife, there is arranged a variable length ~onnacting shaft, a tooth belt drive or other flexible, but positive torque tr~nsmitting device~
l~ith this apparatus, exact uniform cuts without non-uniformity are attained. This is achieved, on the one hand, in that the knife engages a ~trip to be cut without loss of speed of rotation and severs a strip with unifarm rotation and cutting speed and that, on the other hand, the fast b~rinq mount of the knife shaft on the drive housing of the transverse movement mechanism prevents deflection of the knife shaft, in particular at the beginning of a cut. In this manner, tbe heavy drive motor for the knife ~l~a~ not move with the knife shaft so that at the reversal points of the .m3v~r3~ movement of the knife, there is only a relatively small mass which m~l3t be brakecl and again accelerated. The use of the telescopic drive shaft ~ar the kni~e provides a connection of the re~uired torsional strength b~tween the driving motor and the knife which is necessary to keep the rotational speed of the knife constant at the beginning of the cut. Also, the ~;election of a roll-ring drive leads to a reduction of the mass which is required to be moved. With the roll-ring drive, only the housing for the three roller bearings on which the bearing for the knife shaft is mounted, ha~; to be moved. In this manner the mass that has to be transported in the t~ansverse movement is so limited that the braking and re-acceleration of the mass requires only a very short period of time. In this manner, a high cutting frequency can be attained.
It is advantageous when reversing detents for the roll-ring drive are adjustably mounted at predetermined positions on the mounting support.
This cuttillg apparatus can be produced in two embodiments.
On~a embodiment is characterized in that the mechanism for transverse movam~nt and the motor are arranged on a seesaw which is pivotal about a h~i%ontal axi~ with l:his tillable see~aw, the axis can be positioned so that it pas3~s through the center of gravit:y of the seesaw~ In this manner, the heavy driving motor ~or the rotating knife can be accommodated on the tillable seesaw without its mass influencing the time required for the acceleration and braking of the seesaw~
This construction provides a very simple solution when the knife shaft, tha ~onn~ctin~ shaft and the shaft of the motor, lie in a common plane. At th~ s~me time, abrasion is hereby still further reduced~
The other preferred embodiment of the cutting apparatus consists thalain th~t the knife shaft~ Its bearing and the transverse movement m~hanism are arran~ed on a common carriage with which the knife is ma~f~bl~ p~rall~l to itself from itself from its cutting region of the strip to be ~lt~ With this ernbodinnent, the heavy driving motor for the knife is fast on tha machin~ ~rame while the transport mechanism with its motor and the bearin~s for the knife shaft are mounted on a carriage or a sled which runs ~r slides on guide rails~ Movement is preferable effected by a pneumatic cylinder~
~PP~RATU~; ~O~ CUTTl NG PROF~T~ IP~
~ORM~:n 0~ RITI~F~R M I~TIJRT~
FIELD OF THE INVENTION
This invention relates to apparatus for cutting into sections a profile strip of a rubber mixture which is formed by extrusion and/or calandering and which is transported by a conveyor which is intermittently stopped for th~ cuttin~ operation. The apparatus comprises a knife in the form of a ~ir~ r ~ 3k which is mounted on a knife shaft and driven by a motor th~ou~h a flexible sha~t and a transverse motion mechanism for moving the knife back and forth between two predetermined end positions and for raising the knife to a higher position during the return stroke than during the cutting stroke.
.R~R~ROUND OF THEINVENTION:
In the production of single and multiple layer rubber strips for the ~nanufacture of tires, for example protector or tire sidewall profiles, not onlyhi~h quality but also high frequency of cuts per unit time must be obtained in or~l~r t~ maet the proeluction requirements of tire production. The cut ~u~lity i~ o pPtrl~icular impo~tanc:e in the production of radial tires and the~ut ~ uancy is necessary in order to obtain economical production.
~ utting app~ratus according to the state of the art, almost without axcapti~n, uses a fast rotating circular knife which during the cut must be lubri~ated with steam or by a liquid vapor. There are embodiments in which the circular knife is mounted dir-ectly on the shaft of the driving motor which then must be moved with the knife and protection devices transversely of the proiile strip. In order to malce a cut on a moving profile strip, such cutting machine had a carriage which through coupling to the transport device 2~3~i during the cutting operation moved synchronously with the rubber profile strip to be cut. With higher production rates, this cutting apparatus soon became inoperable because the return movement of the carriage with the cutting apparatus could not be accomplished in the short time period.
The further development of the cutting apparatus was to the effect that the rubber strip to be cut would be stopped for a short period of time for the cutting operation, which required braking and accelerating mechanism for th~ transport element and raised serious problems of precision which, h~w~v~!r, coukl be solved. However, it showed the limits of performance in th~ transverse movement of the rotating cutting knife, since because of the r~latively great mass, in particular of the knife motor, the speed of movement could not be as high as required for efficient operation, in particular the required cutting frequency desired for the extrusion apparatus. However, not only the weight of the driving motor for the knife set limits on increase in spee~l of production, but also the transport mechanism, for the most part ~o~ g screw spindles, which were driven by brake motors and which, on account of the fre~uent acceleration and braking, were subject to serious ~b~a3i~n~ The starting and braking operations of the transverse movement lve~l s~rong forces which affect the entire CUttùlg machine and are not ~ndur~
It has be~n sought to carry out the cutting operation in both cti~n~ by mak~ng one cut from left to right and the next cut from right t~ le~t~ HOWeVeL', this gave dissimilar cut pictures which led to problems in the packagiilg of tires. It is, hence necessary, in the return movement of the knife, to raise the knife together with the knife holder over the profile strip to be cut at the end of a cut, then draw it back over the profile strip and then for carrying out the next cut, again lower the knife as is described for ~xample in DE-PS 11 86 209.
h ~
The apparatus know through this publication has, as the cross feed mechanism, a carriage which is displaceable on guide rails and is shoved back and forth by a chain between two guide wheels. The carriage has a cradle with bearings for the knife shaft. The movement of the cradle is derived ~rom a roc~cer arm which is linked to the chain and the carriage and which transmits the chain movement to the carriage. On account of the inexact cradte hei~ht acljustment there are additionally provided pivot adjustments.
~ha driving Inotor is connected with the knife shaft by a flexible shaft. With thi3 ~rr~ln~ement an exact cut is not possible~ The non-uniformities which occu~ lie in somewhat like positions and hence largely compensate one another but this is not sufficient for modern requirements of tire quality.
The use of pneumatic thrust cylinders instead of threaded spindles l~ads to an almost abrasion free method of operation but does not achieve the desired result, since, because of the short time of the entire operation, the thr~l~3t of acc~leration and braking cannot be sufficiently damped. Moreover, ~h~a pn~umatic transport devices have the objection that they cannot be brought to a uniform transverse velocity during the cut, since at the m~m~nt cf cutting, the resistance-responsive forward velocity is decreas~d.
Th~ 1~ to un~lean cuts~ ~ydraulic drives for the transverse movement of tha k~i~ ar~ prohibitecl, not only by reason of cost, but also because of the h~ thru~t which occurs with hydraulic mechanism in fast acceleration and ki~
SUHM~RY OF T~E INVENTION:
The present invention avoids the disadvantages of the state of the art.
It is the object of the invention to increase in a simple manner, the speed of operation of the cutting apparatus in making precise cuts.
The cutting apparatus in accordance with the invention attalns these objectives by providing apparatus in which the knife shaft, its bearings and the transverse movement mechanism are arranged on a common displaceable or swingable mounted support, the transverse movement mechanism is a roll-ring drive, the drive shaft for the transverse movement mechanism is rotatable in bearings fast on the mounting support, the knife shaft is rotatable but not axially slidable in or on a bearing housing mounted on the housing of the tran~varse movement mechanism and between the knife shaft and the shaft of th~ motor ~or driving the linife, there is arranged a variable length ~onnacting shaft, a tooth belt drive or other flexible, but positive torque tr~nsmitting device~
l~ith this apparatus, exact uniform cuts without non-uniformity are attained. This is achieved, on the one hand, in that the knife engages a ~trip to be cut without loss of speed of rotation and severs a strip with unifarm rotation and cutting speed and that, on the other hand, the fast b~rinq mount of the knife shaft on the drive housing of the transverse movement mechanism prevents deflection of the knife shaft, in particular at the beginning of a cut. In this manner, tbe heavy drive motor for the knife ~l~a~ not move with the knife shaft so that at the reversal points of the .m3v~r3~ movement of the knife, there is only a relatively small mass which m~l3t be brakecl and again accelerated. The use of the telescopic drive shaft ~ar the kni~e provides a connection of the re~uired torsional strength b~tween the driving motor and the knife which is necessary to keep the rotational speed of the knife constant at the beginning of the cut. Also, the ~;election of a roll-ring drive leads to a reduction of the mass which is required to be moved. With the roll-ring drive, only the housing for the three roller bearings on which the bearing for the knife shaft is mounted, ha~; to be moved. In this manner the mass that has to be transported in the t~ansverse movement is so limited that the braking and re-acceleration of the mass requires only a very short period of time. In this manner, a high cutting frequency can be attained.
It is advantageous when reversing detents for the roll-ring drive are adjustably mounted at predetermined positions on the mounting support.
This cuttillg apparatus can be produced in two embodiments.
On~a embodiment is characterized in that the mechanism for transverse movam~nt and the motor are arranged on a seesaw which is pivotal about a h~i%ontal axi~ with l:his tillable see~aw, the axis can be positioned so that it pas3~s through the center of gravit:y of the seesaw~ In this manner, the heavy driving motor ~or the rotating knife can be accommodated on the tillable seesaw without its mass influencing the time required for the acceleration and braking of the seesaw~
This construction provides a very simple solution when the knife shaft, tha ~onn~ctin~ shaft and the shaft of the motor, lie in a common plane. At th~ s~me time, abrasion is hereby still further reduced~
The other preferred embodiment of the cutting apparatus consists thalain th~t the knife shaft~ Its bearing and the transverse movement m~hanism are arran~ed on a common carriage with which the knife is ma~f~bl~ p~rall~l to itself from itself from its cutting region of the strip to be ~lt~ With this ernbodinnent, the heavy driving motor for the knife is fast on tha machin~ ~rame while the transport mechanism with its motor and the bearin~s for the knife shaft are mounted on a carriage or a sled which runs ~r slides on guide rails~ Movement is preferable effected by a pneumatic cylinder~
3 ~. ~
It is advantageous when the carrier is movable ~n a plane parallel to the knife or perpendicular to the knife shaft from the cutting region of the strip to be cut.
~ nother possibility, is that the guide rail is arranged vertically.
In this kind of emboc~iment, it i:~; advantageous when detents for reversing the roll-ring drive are arranged in predetermined selected positions on the support. Instead of guide rails, a parallel linkage mechanism can ?~rve for movement of the carrier.
RBI~F l)ESCRlPTlON OF THE DRAWINGS:
The essence of the invention will be more fully understood from the following description of the preferred embodiments shown schematically in the accompanying dra~1ings in which:
Fig. 1 is a side elevation of the cutting apparatus during a cut;
Fi~ a ~icle elevation of the apparatus during return movement of th~ knife;
Fi~. 3 is a front elevation of the apparatus;
Fi~ 4 i~ a si~a view of the cut strip;
Fi~ an end v;ew of the cut strip;
Fi~ 6 is a top per3pective vi~w of the cut strip;
Fi~ 7 is a lon~ituclinal section through the roll riulg drive;
Fig~ ~ is a cross section of the roll-ring drive;
Fig. 9 is a top plan view of the roll-ring drive;
Fig. 10 is a side elevation of a second embodiment of the invention with, a movable carrier for the transverse movement mechanism which is formed as a carriage which is displaceable on guide rails arranged in an inclined position on the machine frame;
Fig~ 11 is a side elevation of a further embodiment of the invention in WhiC}I the carrier for the transverse motion mechanism is displaceable on vertical guide rails; and Fig. 12 is a side elevation of a further embodiment of the invention in which the carrier for the transverse motion mechanism is adjustable in height by a parallelogram linkage.
DESCRIPTION OF PREFERRED EMBODIMENTS:
The cutting apparatus has a machine Erame 1 in which a conveyor belt 2 transports a profile strip 3 which is coming from a cooling device (not shown) and which is to be cut into precise lengths. The cutting is accomplished by a rotating circular knife 4 which engages a groove in a ledge S serving as a cutting support. This supplied profile strip 3 is momentarily stopped for the cut by stopping the conveyor belt 2 and stopping a pressure roller 6. The cut sections 7 of the roller strip are transported from the cutting knife by a conveyor belt 8.
The knife 4 is secured on a knife shaft 9 which is rotatably supported by a bearing housing 10 which is mounted on the transverse drive housing 11. This transverse drive housing 11 is freely displaceable to and fro on the drive shaft 12 of the transverse motion mechanism. Reversing abutments 13 determine the end points of the reversal of movement of the transverse drive housing 11 on the drive shaft 12. This drive shaft 12 is rotatably supported in bearings 14 and is driven by a motor 15.
The drive of the rotating knife 4 is effected by a motor 16 through an articulated shaft 17, which is telescopic. All of these machine parts are mounted on a seesaw 18. The motor 15 and 16 are mounted fast on the seesaw 18 as are also the bearings 14 for the drive shaft 12. Also, a guide rail 19 is mounted fast on the seesaw 18. I'he transverse drive housing 11 is movable along this guide rail 19. The guide rail 19 serves to guide the transverse drive housing 11 back and forth without rotation. Two reversing abutments or detents 13 are mounted on the seesaw 18 in fixed, but adjustable, positions spaced from one another. They determine the length of stroke of the transverse drive housing 11.. For the cutting of wide protector strips, these reversing detents 14 are spaced further apart from one another than for the cutting of small sidewall strips. The seesaw 18 is pivotal about a horizontal axis 20. It is moved pivotally about its axis between a cutting position and a return position by means of a pneumatic servo motor drive 21 and in the end positions is held by abutments 22, 23, of which the abutment 22 determines the cutting position and the abutment 23 determines the return position.
The transverse drive housing 11 is traversed by the drive shaft 12.
In the interior of the transverse drive housing 11, there are three ball bearings 24, 25, which are arranged eccentric to the axis of the drive shaft 12.
The ball bearings 24, 25 have an inner diameter which is larger than the outer diameter of the drive shaft 12 and are pressed against the drive shaft 12 by spring washers 36 which act on one roller bearing and thereby press all of the roller bearings are pressed against one side of the shaft 12 while the central ball bearing is pressed against the diametrically opposite side of the shaft. The ball bearings 24, 25 are held in pivoted holders 26.
According to the adjusted angle of tilt in dependence on the direction of rotation of the drive shaft 12, a lateral force component is exerted on the, transverse drive housing 11 relative to the shaft 12, which effects precise movement of the transverse drive housing relative to the drive shaft. The tilt of the three ball bearings 24, 25 is adjusted by means of a common adjustment plate 27 which has openings for pins 28 on the holders 26 of the ball bearings. The position of thi.s adjustment plate 27 is adjusted by the reversing detents 13 which engages the adjustment plate 27 in its two end positions.
In the embodiment of Fig. 10 the driving motor 16 of the knife shaft 9, is mounted fast on the support 32 on the machine frame 1. The transverse feed mechanism in the form of a roll-ring drive with transverse drive housing 11 drive shaft 12 and the motor 15 are mounted on a carrier 29 which is shown as a carriage wi.th wheels running on guide rails 30 in a direction indicated by the double arrow with the help of servo-motor 21 which is formed as a pneumatic piston-cylinder-unit. ~t the reversal points of the transverse movement in which the knife remains outside the strip to be cut for a short period, the movement of the carriage 29 is effected by the servo-motor 21.
In the embodiment of Fig. 11, the carrier 29 is formed as a slide which has wheels 33 running on the vertically arranged guide rails 30 and is moved by means of a servo-motor 21 in order to raise the knife 4 to its upper position during its return movement without contacting the strip 3 to be cut.
Also here the parts 10, 11 and 12 of the transverse movement mechanism are mounted on the slide serving as the carrier 29. The bearing housing 10 for the knife shaft 9 is mounted fast on the transverse drive housing 11 of the transverse movement mechanism.
In the embodiment of Fig. 12, the transverse movement mechanism 10, 11, 12 is supported links of .34, 35 of a parallel motion mechanism of which the upper link is a double arm link of which one arm is connected to the servo-motor 21.
b:~SS/6020-41speci~ic/Hay 22.92/sm w 2659
It is advantageous when the carrier is movable ~n a plane parallel to the knife or perpendicular to the knife shaft from the cutting region of the strip to be cut.
~ nother possibility, is that the guide rail is arranged vertically.
In this kind of emboc~iment, it i:~; advantageous when detents for reversing the roll-ring drive are arranged in predetermined selected positions on the support. Instead of guide rails, a parallel linkage mechanism can ?~rve for movement of the carrier.
RBI~F l)ESCRlPTlON OF THE DRAWINGS:
The essence of the invention will be more fully understood from the following description of the preferred embodiments shown schematically in the accompanying dra~1ings in which:
Fig. 1 is a side elevation of the cutting apparatus during a cut;
Fi~ a ~icle elevation of the apparatus during return movement of th~ knife;
Fi~. 3 is a front elevation of the apparatus;
Fi~ 4 i~ a si~a view of the cut strip;
Fi~ an end v;ew of the cut strip;
Fi~ 6 is a top per3pective vi~w of the cut strip;
Fi~ 7 is a lon~ituclinal section through the roll riulg drive;
Fig~ ~ is a cross section of the roll-ring drive;
Fig. 9 is a top plan view of the roll-ring drive;
Fig. 10 is a side elevation of a second embodiment of the invention with, a movable carrier for the transverse movement mechanism which is formed as a carriage which is displaceable on guide rails arranged in an inclined position on the machine frame;
Fig~ 11 is a side elevation of a further embodiment of the invention in WhiC}I the carrier for the transverse motion mechanism is displaceable on vertical guide rails; and Fig. 12 is a side elevation of a further embodiment of the invention in which the carrier for the transverse motion mechanism is adjustable in height by a parallelogram linkage.
DESCRIPTION OF PREFERRED EMBODIMENTS:
The cutting apparatus has a machine Erame 1 in which a conveyor belt 2 transports a profile strip 3 which is coming from a cooling device (not shown) and which is to be cut into precise lengths. The cutting is accomplished by a rotating circular knife 4 which engages a groove in a ledge S serving as a cutting support. This supplied profile strip 3 is momentarily stopped for the cut by stopping the conveyor belt 2 and stopping a pressure roller 6. The cut sections 7 of the roller strip are transported from the cutting knife by a conveyor belt 8.
The knife 4 is secured on a knife shaft 9 which is rotatably supported by a bearing housing 10 which is mounted on the transverse drive housing 11. This transverse drive housing 11 is freely displaceable to and fro on the drive shaft 12 of the transverse motion mechanism. Reversing abutments 13 determine the end points of the reversal of movement of the transverse drive housing 11 on the drive shaft 12. This drive shaft 12 is rotatably supported in bearings 14 and is driven by a motor 15.
The drive of the rotating knife 4 is effected by a motor 16 through an articulated shaft 17, which is telescopic. All of these machine parts are mounted on a seesaw 18. The motor 15 and 16 are mounted fast on the seesaw 18 as are also the bearings 14 for the drive shaft 12. Also, a guide rail 19 is mounted fast on the seesaw 18. I'he transverse drive housing 11 is movable along this guide rail 19. The guide rail 19 serves to guide the transverse drive housing 11 back and forth without rotation. Two reversing abutments or detents 13 are mounted on the seesaw 18 in fixed, but adjustable, positions spaced from one another. They determine the length of stroke of the transverse drive housing 11.. For the cutting of wide protector strips, these reversing detents 14 are spaced further apart from one another than for the cutting of small sidewall strips. The seesaw 18 is pivotal about a horizontal axis 20. It is moved pivotally about its axis between a cutting position and a return position by means of a pneumatic servo motor drive 21 and in the end positions is held by abutments 22, 23, of which the abutment 22 determines the cutting position and the abutment 23 determines the return position.
The transverse drive housing 11 is traversed by the drive shaft 12.
In the interior of the transverse drive housing 11, there are three ball bearings 24, 25, which are arranged eccentric to the axis of the drive shaft 12.
The ball bearings 24, 25 have an inner diameter which is larger than the outer diameter of the drive shaft 12 and are pressed against the drive shaft 12 by spring washers 36 which act on one roller bearing and thereby press all of the roller bearings are pressed against one side of the shaft 12 while the central ball bearing is pressed against the diametrically opposite side of the shaft. The ball bearings 24, 25 are held in pivoted holders 26.
According to the adjusted angle of tilt in dependence on the direction of rotation of the drive shaft 12, a lateral force component is exerted on the, transverse drive housing 11 relative to the shaft 12, which effects precise movement of the transverse drive housing relative to the drive shaft. The tilt of the three ball bearings 24, 25 is adjusted by means of a common adjustment plate 27 which has openings for pins 28 on the holders 26 of the ball bearings. The position of thi.s adjustment plate 27 is adjusted by the reversing detents 13 which engages the adjustment plate 27 in its two end positions.
In the embodiment of Fig. 10 the driving motor 16 of the knife shaft 9, is mounted fast on the support 32 on the machine frame 1. The transverse feed mechanism in the form of a roll-ring drive with transverse drive housing 11 drive shaft 12 and the motor 15 are mounted on a carrier 29 which is shown as a carriage wi.th wheels running on guide rails 30 in a direction indicated by the double arrow with the help of servo-motor 21 which is formed as a pneumatic piston-cylinder-unit. ~t the reversal points of the transverse movement in which the knife remains outside the strip to be cut for a short period, the movement of the carriage 29 is effected by the servo-motor 21.
In the embodiment of Fig. 11, the carrier 29 is formed as a slide which has wheels 33 running on the vertically arranged guide rails 30 and is moved by means of a servo-motor 21 in order to raise the knife 4 to its upper position during its return movement without contacting the strip 3 to be cut.
Also here the parts 10, 11 and 12 of the transverse movement mechanism are mounted on the slide serving as the carrier 29. The bearing housing 10 for the knife shaft 9 is mounted fast on the transverse drive housing 11 of the transverse movement mechanism.
In the embodiment of Fig. 12, the transverse movement mechanism 10, 11, 12 is supported links of .34, 35 of a parallel motion mechanism of which the upper link is a double arm link of which one arm is connected to the servo-motor 21.
b:~SS/6020-41speci~ic/Hay 22.92/sm w 2659
Claims (17)
1. Cutting apparatus for cutting into sections a profile strip of rubber mixture formed by extrusion and/or calendering and transported by a conveyor which is stopped intermittently for making a cut, said apparatus comprising a frame, a circular knife, a knife shaft on which said knife is mounted, bearing means for rotatably supporting said knife shaft and knife, a motor for driving said knife shaft and knife in rotation;
a transverse movement mechanism for moving said knife transversely of said profile strip;
and height control means for positioning said knife at a lower height when moving in a cutting direction to effect a cut of said profile strip and for raising said knife to a higher height above said profile strip for return movement of said knife;
said transverse movement mechanism comprising a transverse shaft extending transversely of said profile strip, said transverse shaft being fixed in an axial direction and rotatable about its axis, a motor for driving said transverse shaft in rotation, a drive housing through which said transverse shaft extends and on which said bearing means for said knife shaft are mounted, a plurality of ball bearings housed in said drive housing and encircling said transverse shaft, said ball bearings having an inner diameter greater than the outer diameter of said transverse shaft, spring means for pressing said ball bearings against diametrically opposite sides of said transverse shaft, mounting means for mounting said bearings tiltably in said drive housing at an angle inclined to the axis of said transverse shaft to produce a force for moving said drive housing axially of said transverse shaft and means for reversing the tilt of said ball bearings to reverse the direction of said force and thereby reverse the direction of movement of said drive housing axially of said transverse shaft.
a transverse movement mechanism for moving said knife transversely of said profile strip;
and height control means for positioning said knife at a lower height when moving in a cutting direction to effect a cut of said profile strip and for raising said knife to a higher height above said profile strip for return movement of said knife;
said transverse movement mechanism comprising a transverse shaft extending transversely of said profile strip, said transverse shaft being fixed in an axial direction and rotatable about its axis, a motor for driving said transverse shaft in rotation, a drive housing through which said transverse shaft extends and on which said bearing means for said knife shaft are mounted, a plurality of ball bearings housed in said drive housing and encircling said transverse shaft, said ball bearings having an inner diameter greater than the outer diameter of said transverse shaft, spring means for pressing said ball bearings against diametrically opposite sides of said transverse shaft, mounting means for mounting said bearings tiltably in said drive housing at an angle inclined to the axis of said transverse shaft to produce a force for moving said drive housing axially of said transverse shaft and means for reversing the tilt of said ball bearings to reverse the direction of said force and thereby reverse the direction of movement of said drive housing axially of said transverse shaft.
2. Cutting apparatus according to claim 1, in which said bearing means for said knife shaft, said motor for driving said knife shaft and knife, and said transverse movement mechanism are mounted on a seesaw which is tiltable about a horizontal axis and in which said height control means comprises means for tilting said seesaw about its axis between a position in which said knife is at a lower height and a position in which said knife is at a higher height.
3. Cutting apparatus according to claim 2, in which means for reversing the direction of movement of said drive housing of said transverse motion mechanism comprises reversing abutments located in selected positions on said seesaw and engageable by said means for reversing the tilt of said ball bearings of said transverse movement mechanism.
4. Cutting apparatus according to claim 1, in which said motor for driving said knife has a shaft which is connected with said knife shaft by a connecting shaft and in which said motor shaft, said connecting shaft, and said knife shaft lie in a common plane.
5. Cutting apparatus, according to claim 1, in which said motor for driving said knife is connected with said knife shaft by a telescopic connecting shaft.
6. Cutting apparatus, according to claim 1, in which said knife shaft, bearing means for rotatably supporting said knife shaft and said transverse movement mechanism are arranged on a common carrier by which said knife is moveable parallel to itself between a cutting position and a raised position.
7. Cutting apparatus according to claim 6, in which said means for reversing the tilt of said ball bearings to reverse the direction of movement of said drive housing of said transverse movement mechanism comprises abutments disposed in selected positions on said carrier.
8. Cutting apparatus, according to claim 6, in which said carrier is moveable on guide rails parallel to said knife.
9. Cutting apparatus, according to claim 6, in which said carrier is mounted on a parallel motion linkage for movement parallel to said knife.
10. Cutting apparatus, according to claim 8, further comprising a servo-motor for moving said carriage on said guide rails.
11. Cutting apparatus according to claim 1, in which said drive housing of said transverse movement mechanism is mounted on a carriage which is movably supported on said frame and in which said bearing means for rotatably supporting said knife shaft is mounted on said drive housing.
12. Cutting apparatus for cutting into sections a profile strip of rubber mixture formed by extrusion and/or calendering and transported by a conveyor which is stopped intermittently for making a cut, said apparatus comprising a frame, a seesaw mounted on said frame for pivotal movement about a horizontal axis;
a circular knife, a knife shaft on which said knife is mounted, bearing means for rotatably supporting said knife shaft and knife, a motor for driving said knife shaft and knife and a transverse movement mechanism for moving said knife transversely of said profile strip, all mounted on said seesaw; and means for moving said seesaw pivotally about its axis to move said knife between a cutting height for cutting said profile strip when moved transversely of said profile strip by said transverse movement mechanism and a height above said profile strip for return movement of said knife by said transverse movement mechanism.
a circular knife, a knife shaft on which said knife is mounted, bearing means for rotatably supporting said knife shaft and knife, a motor for driving said knife shaft and knife and a transverse movement mechanism for moving said knife transversely of said profile strip, all mounted on said seesaw; and means for moving said seesaw pivotally about its axis to move said knife between a cutting height for cutting said profile strip when moved transversely of said profile strip by said transverse movement mechanism and a height above said profile strip for return movement of said knife by said transverse movement mechanism.
13. Cutting apparatus according to claim 12, further comprising a pneumatic servo-motor means acting between said seesaw and said frame for moving said seesaw about its pivotal axis.
14. Cutting apparatus for cutting into sections a profile strip of rubber mixture formed by extrusion and/or calendering and transported by a conveyor which is stopped intermittently for making a cut, said apparatus comprising a frame, a circular knife, a knife shaft on which said knife is mounted, bearing means for rotatably supporting said knife shaft, a motor for driving said knife shaft and knife in rotation, a transverse movement mechanism for moving said knife transversely of said profile strip for making a cut;
and a carriage on which said knife, said knife shaft, said bearing means for rotatably supporting said knife shaft and said transverse movement mechanism are mounted;
said motor for driving said knife shaft and knife in rotation being mounted on said frame;
means for guiding said carriage in movement between a position in which said knife is at a height for cutting said profile strip when moved transversely by said transverse movement mechanism and a position in which said knife is at a height above said profile strip for return movement of said knife by said return movement mechanism;
and means for moving said carriage between said positions and flexible shaft means for connecting said motor with said knife shaft.
and a carriage on which said knife, said knife shaft, said bearing means for rotatably supporting said knife shaft and said transverse movement mechanism are mounted;
said motor for driving said knife shaft and knife in rotation being mounted on said frame;
means for guiding said carriage in movement between a position in which said knife is at a height for cutting said profile strip when moved transversely by said transverse movement mechanism and a position in which said knife is at a height above said profile strip for return movement of said knife by said return movement mechanism;
and means for moving said carriage between said positions and flexible shaft means for connecting said motor with said knife shaft.
15. Cutting apparatus according to claim 14, in which said means for guiding said carriage comprises a guide track on said frame.
16. Cutting apparatus according to claim 14, in which said means for guiding said carriage comprises a parallelogram linkage mechanism.
17. Cutting apparatus according to claim 14, further comprising a pneumatic servo-motor mechanism for moving said carriage.
b:WSS/6020-4/claims/May 21.92/sm w:1136
b:WSS/6020-4/claims/May 21.92/sm w:1136
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4116971A DE4116971C2 (en) | 1991-05-24 | 1991-05-24 | Cutting device for a profile strip formed from rubber compounds |
| DEP4116971.9 | 1991-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2069391A1 true CA2069391A1 (en) | 1992-11-25 |
Family
ID=6432335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002069391A Abandoned CA2069391A1 (en) | 1991-05-24 | 1992-05-25 | Apparatus for cutting profile strips formed of rubber |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0518043B1 (en) |
| JP (1) | JPH05177583A (en) |
| KR (1) | KR920021273A (en) |
| CA (1) | CA2069391A1 (en) |
| CZ (1) | CZ281479B6 (en) |
| DE (2) | DE4116971C2 (en) |
| HU (1) | HUT62826A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19654408A1 (en) * | 1996-12-24 | 1998-06-25 | Continental Ag | Process for cutting an unvulcanized rubber profile to size using a cutting edge |
| DE19914194C2 (en) * | 1999-03-24 | 2001-09-27 | Mannesmann Ag | Cutting machine with a rotating driven cutting knife |
| GB201303178D0 (en) * | 2013-02-22 | 2013-04-10 | Uhing Joachim Gmbh & Co Kg | Reversal mechanism for a rolling ring drive |
| CN114471268B (en) * | 2016-11-01 | 2024-05-24 | 生命科技股份有限公司 | Liquid mixing system with vertically adjustable mixing element and method of use thereof |
| CN109465871B (en) * | 2018-12-29 | 2024-02-09 | 湖南联创兴电子科技有限公司 | PCB board on-line cutting device |
| CN110744739B (en) * | 2019-10-28 | 2020-09-18 | 山东水星博惠汽车部件股份有限公司 | Automatic rubber cutting device for mixing of automobile synthetic rubber parts |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB441648A (en) * | 1934-10-30 | 1936-01-23 | Dunlop Rubber Co | Apparatus for cutting strip or the like material |
| US2544241A (en) * | 1946-05-01 | 1951-03-06 | Goodrich Co B F | Apparatus for cutting material |
| US2550191A (en) * | 1947-03-12 | 1951-04-24 | Us Rubber Co | Automatic cutting device |
| US3072004A (en) * | 1959-07-31 | 1963-01-08 | Armstrong Rubber Co | Severing apparatus |
| DE1186209B (en) * | 1961-11-17 | 1965-01-28 | Continental Gummi Werke Ag | Cutting device for cutting tire treads to length |
| DE1806747A1 (en) * | 1968-11-02 | 1970-05-21 | Schwermaschb Ernst Thaelmann V | Device for regulating the speed of the carrier of tools, devices and the like. |
| IT1198196B (en) * | 1986-11-28 | 1988-12-21 | Pirelli | DEVICE SUITABLE FOR CUTTING OR TRIMMING EDGES OF RUBBERIZED FABRICS, EQUIPPED WITH TRANSVERSAL REINFORCEMENT ELEMENTS, FITTED WITH ONE OF THE SAID REINFORCEMENT ELEMENTS |
| US4813319A (en) * | 1987-04-01 | 1989-03-21 | The Firestone Tire & Rubber Company | Method and apparatus for transversely cutting strips of deformable material |
-
1991
- 1991-05-24 DE DE4116971A patent/DE4116971C2/en not_active Expired - Fee Related
-
1992
- 1992-04-30 EP EP92107358A patent/EP0518043B1/en not_active Expired - Lifetime
- 1992-04-30 DE DE59204173T patent/DE59204173D1/en not_active Expired - Fee Related
- 1992-05-19 KR KR1019920008417A patent/KR920021273A/en not_active Application Discontinuation
- 1992-05-20 HU HU9201675A patent/HUT62826A/en unknown
- 1992-05-22 CZ CS921550A patent/CZ281479B6/en unknown
- 1992-05-22 JP JP4156011A patent/JPH05177583A/en active Pending
- 1992-05-25 CA CA002069391A patent/CA2069391A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| KR920021273A (en) | 1992-12-18 |
| HUT62826A (en) | 1993-06-28 |
| DE4116971C2 (en) | 1996-07-25 |
| EP0518043B1 (en) | 1995-11-02 |
| HU9201675D0 (en) | 1992-09-28 |
| EP0518043A1 (en) | 1992-12-16 |
| JPH05177583A (en) | 1993-07-20 |
| CZ281479B6 (en) | 1996-10-16 |
| DE59204173D1 (en) | 1995-12-07 |
| DE4116971A1 (en) | 1992-11-26 |
| CS155092A3 (en) | 1992-12-16 |
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| EEER | Examination request | ||
| FZDE | Dead |