CA1036767A - Device for adjusting the opening travel of the movable plate of a moulding machine for plastic materials - Google Patents
Device for adjusting the opening travel of the movable plate of a moulding machine for plastic materialsInfo
- Publication number
- CA1036767A CA1036767A CA205,275A CA205275A CA1036767A CA 1036767 A CA1036767 A CA 1036767A CA 205275 A CA205275 A CA 205275A CA 1036767 A CA1036767 A CA 1036767A
- Authority
- CA
- Canada
- Prior art keywords
- piston
- mould
- opening travel
- movable
- movable plate
- 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.)
- Expired
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 title claims abstract description 7
- 239000004033 plastic Substances 0.000 title claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 5
- 239000012815 thermoplastic material Substances 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
- B29C45/6778—Stroke adjusting or limiting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A device for adjusting the opening travel of a mould holder unit of a machine for moulding plastic materials, comprising a mova-ble plate which is arranged to support a portion of the mould and is actuated by at least one cylinder comprising a piston movable in a casing, said plate being movable, during the opening travel, from a fir&t position, in which the mould is closed, to a second position in which the mould is open, is described On a part rigidly connected to the piston is a member movable axially relative to the piston, fixable manually with respect to it and arranged to cooperate with a portion of said casing in order to stop the piston during said opening travel.
A device for adjusting the opening travel of a mould holder unit of a machine for moulding plastic materials, comprising a mova-ble plate which is arranged to support a portion of the mould and is actuated by at least one cylinder comprising a piston movable in a casing, said plate being movable, during the opening travel, from a fir&t position, in which the mould is closed, to a second position in which the mould is open, is described On a part rigidly connected to the piston is a member movable axially relative to the piston, fixable manually with respect to it and arranged to cooperate with a portion of said casing in order to stop the piston during said opening travel.
Description
~.0;~6~76J7 . ~he present invention relates to a device for adjusting the openin~ travel of the movable plate of a moulding ma¢hine for plastic material~, by means of uhich it i9 possible to stop said plate in a pre-e~tablished position during said opening tra~el As it is well-~nown, the moulding presses or moulding machines for plastic materials, in particu-lar thermoplastic materials, are provided with a mould holder unit compri~ing a pair of plates between which is positioned the mould and one of which is arranged to move P~ all~ with r~spact to the other, departing from or approaching said other plate in order to allo~, respectively, the opening or the closure of the mould.
~ ormaIly, said movable plate is actuated by a ~lowdynamical cylinder controlling a kinematic toggle mechanism, which i9 apt to caase said plate to move ~rom a first position to a second po~ition, in which positions said plate is located, respecti-vely, at the mininal and the maximal distance ~rom said other plate. ~ .
lhe movable plate reaches the first of said - c -two positions when the kinematic tog~le mechanism is in its extended position, i. e. in a position in which some of the members which constitute said mecha-nism arrange themselve~ themselves in such a way as to originate sub3ta~tially a chain o~ support bars which are apt to support the high in~ection pressure~
which discharge themselves onto tho movable plate.
~ he travel of thi~ piate, which is necessary for moving it fxom said first position to said secona position, must be adjustable in accordance with the characteri~tic~ and dimensio~s of the mould mounted on the pres~, so that the above-mentioned second posi-tion must be variable to conform with the different conditions of operation of the machine.
In the prior ~rt machines, the adjustment of the travel of said plate, and consequently the fixing of said second po~ition, is obtained by acting on the hydraulic device which controls the flowdynamical cy~inder actuating the kinematic togOle device; in fact, by`discontinuing the feed of the ~orking fluid to the flowdynamical cylinder during the opening travel of the movable plate it i~ po~ible to stop the latter in a pre-established position. ~owever, the adjustment of the end of travel position o~ the movable plate, effected in the way described above, ~0367~7 presents some di~advantages. First of all, said po~ition cannot be fixed very precisely, nor is it possible to stop said plate alway~ in the same posi-tion dl~ring each opening cycle of the machine Furthermore, the stop of the movable plate thus obtained is not positive, that is to say that if external forces of a high value act on the plate, said plate does not maintain its position.
Also known are manually adjustable screw devices for adjusting the travel of such plates. Such devices comprise sub~tantially a threadad ~tem which is screwed in a nut rigidly connected to the frame of the machine and whose one end passes through a wall of the casing of the flowdynamicàl cylinder to act as a stop for the piston of said c~lindér; the position in which ~aid piston and, consequently, the movable platè are stopped can be varied by turning the threaded stem.
~ he device~ of this type present the disadvanta2e of having a very high axial dimension; in fact, said stem, which protrudes axially from the end of the flowdynamical cylinder, being provided with a smooth cylindrical portion which is apt to tra~erse the end wall of the ca~ing of said cylinder t has a length which is at leaæt twice aæ long as the length of the 103676q travel of the piston which it ha^s to stop.
The object of this invention is to provide a device for adjusting the opening travel of a mould holder unit of a machine for moulding plastic materials, which will allow to eliminate the disadvantages desribed above.
According to the present invention there is provided a device for adjusting the opening travel o a mould holder unit o machine for moulding plastic materials, comprising: a movable plate which is arranged to support a portion of tlle mould, said plate being movable, during the opening travel, from a first position, in which said mould is closed, to a second position in which said mould is open; a cvlinder comprising a piston movable in a casing and arranged to actuate said movable plate; a part rigidly connected to said piston; a member movable axially relative to the piston, and mounted on said part, fixable manually with respect to the piston and arranged to cooperate with a portion of said casing in order to stop the piston during said opening travel.
For a better understanding of the present invention, a particular embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:
FIGURE 1 is a longitudinal section of the device according to the invention;
FIGURE 2 is a partially sectional side elevation -103676~Z
of a mould holder unit of a machine for injection moulding of thermoplastic materials, provided with the device according to the invention, the mo~able platR of ~aid moulding press being shown in the first position described above;
~ IG~RE 3 is a side ele~ational view similar to that shown in ~g. 2, in which the~movable plate of the moulding press is ~hown in the second position described abo~e, in which said plate has been stopped by the device according to the invention.
Referring first to ~igures 2 and 3, a.machine for moulding thermoplastic materials is provided with a mould holder unit, indicated generally by the refe-rence ~umeral l, comprising a stationary plate (not shown) and a mo~able plate 3 slidable on cylindrical guides 4 which are supported by the frame 9 of the machine and betweèn which, in a way known in itself, may be mounted a mould (not shown).
The mo~able plate 3 is actuated by a flowdyna-mical cyiinder, indicated generally with the reference numeral 5, through a kinematic toggle mechanism indi-cated generally with the reference ~umeral 6; in the ca~e of the embodiment shown, said kinematic mechanism consists substantially of two unitsS each of which comprises a crank 7 hinged by means of a pivot 8 on the frame 9 and a pair of connection rods 12 and 13, 10367~7 one end of which being hinged on a pivot 14 of the crank 7, while the other ends are hinged on a movable frame lS and on the movable plate 3, respectively.
The movable rame 15 is fixed to one end of a stem 16 rigidl~ connected to a piston 17 of the flowdvnamical cylinder 5. This cylinder comprises also a casing 18 which has slidably mounted therein the piston 17 and is ixed to the frame 9 of the machine. The piston 17 defines, inside the casin~ 18, a pair of anular chambers 19 and 20, into each of which can be fed a pressurized fluid which causes the piston 17 to move in a predetermined direction, and from each o, which said fluid can be discharged.
~lounted on a machine o the specified type, known in itself, is a device according to the invention, shown in Fig. 1, which device comprises substantially a tubular element 21 (Fig. 1) movable axially on a cylindrical part 23 which is rigidly connected to the piston 17 and is disposed, with respect to the piston 17, at the side opposite the one at which the stem is situated.
The tubular element 21 is provided with an annular protuberance 24 having a shoulder 25 which is arranged ~' ` 1036~
to come into contact with a`correspondent shoulder formed o~ an e~d wall 26 of the casing 18 of the flowdynamical cylinder 5. ~he tubular element 21 i8 also provided with a scre~ nut 27 which is arranged to enga~e with a thread 28 formed on the end of the cylindrical part 23. The tubular element 21 can be rotated, in order to move it axially with respect to the cylindrical part 23, by grasping it, ~or example, at the radial holes 31, and can be fi~ed axially with respect to said cylindrical part by means of a threaded ring 32. Conveniently, but not iecessarily, the cylindrical part 23 is provided with an he~agonal end head 33 which is arranged to prevent said cylindrical part 23 from .
rotating when the hexagonal head is locked by means of a suitable key during the above-mentioned rotation of the tubular element 21 relative to said cylindrical parte.
Con~eniently, between the head 33 and the thread 28 there i~ disposed a resilient ring 34 which is apt to prevent the threaded ring 32 from being completely unscrewed from~ the thread.
Disposed outside the tubular element 21 is a substantially cyli~drical hou~ing 35 which is fastened, in any ~uitable way, to the wall 26 of the flowdynami-cal cylinder 5; o~ a threaded end portio~ of said - housing can be screwed a cover 36 provided with rib~
~0367~7 37 which are arranged to allow the unscrewing of said cover.
The operation of the device described in the foregoing takes place as follows.
~j Let us suppose that a pressurized fluid is fed into the ! interior of the chamber 19 (Figures 1, 3) of the flowdynamical ~, cylinder 5 and that other fluid is discharged from the chamber 20 of said cylinder, thereby cau~ing the piston 17 to move towards the right as seen in the Figures. It follows that both the stem 16 and the movable frame 15 (Figure 3) are displaced in th~ same direction and, starting from the position in which the moulding 3 press is shown in Fig 3, the frame 15, by exerting a thrust on 1 the connection rods 12, produces the rotation of the cranks 7 3 which control the rotation and translation of the connecting rods 13 to cause the kinematic toggle device 6 to assume its completely extended condition shown in Fig. 2. In such condition, the connecting rods 13 and the cranks 7 are substantially aligned and therefore constitute chains of support bars which are capable of supporting the high force which are applied on the movable plate 3 when the moulding press is closed. Thus, the movable plate 3 assumes a position, hereinafter called first position, in which . 1036767 it is situated closer to the ~tationary plate, and the mould, disposed between said two plates, i9 clo~ed; obviously, this position can be varied only by modi~ying the length of the various parts which constitute the toggles 6 (connecting rods 13 or cranks 7).
Sùppose no~ that, starting from said first posi-tion o~ the movable plate 3, the latter has to be moved to a se¢ond position through a prefixed travel beginning from the precedent position.
~ o obtain this i~ is sufficient, after having removed the co~er 36 (~ig. 1), to rotate the tubular element 21 with respect to the thread 28 of the cylindrical part 23; for carrying out said operation it is necessary to unscrew the ring 32 and, by means of a suitable key introduced into the holes 31, rotate the tubular element 21 while holding firmly, by means of another key, the head 33 of the cylindrical part 23. During the rotation of the tubular element 21 with respect to the thread 28 said tubular element i~ moved ~ially with respect to said thread, and ¢onsequently the piston 17 is di~placed axially with respect to the anular protuberance 24 of said tubular element. At the end of the operation, the ring 32 is scre~ed agai~ and the cover 36 is placed again.
Suppo~ing to have set, by the above described :
~03676`7 `
operation, a prefixed travel for the movable plate 3, if pressurized fluid is now introduced into the chamber 20 of the flowdynamical cylinder 5 and fluid is discharged from the other chamber 19, the piston is caused to move to the left as seen in the Figures. At thè end of the travel of the piston, the shoulder 25 of the annular protuberance 24 of the tubular element 21 stops against the corresponding shoulder of the wall 26. In this way, the stem 16 is stopped in a prefixed position to which corresponds said travel end position of the movable plate 3.
It is obvious, therefore, that by displacing, in the way ¦ described precedently, the annular protuberance 24 of the tubular element 21 with respect to the piston 17, pre-established travels ~¦ of the movable plate 3 with respect to the stationary plate are obtained. `~
It follows from the foregoing that the travel of the movable plate 3 can be set by means of the device according to the invention in a very simple and quick way, inasmuch as it is necessary only to act manually on the tubular element 21.
Furthermore, the position obtained is maintained with precision during each subsequent cycle of operation of the moulding press, ¦ without requiring further interventions of the operator or successive adjustments. Finally, , ` ` ^. ` 103676~ . -.
. . . . . - ........ . .
.
.. .. . . . . .
... . . . . .. . ..
.. , . . . ... ` . .: :
. . the stop obtainable with the device according to the so nvention i3 0~ the ~called po3itiYe type, that. i9 . . to ~ay that even under the aotion of high axial forces ; . . .
. ^ exexted on the movable plate 3, the abo~e mentioned ravël end posi~io~ is absolutely not subject to a~y .~ariationi obviously~ this depends upon ~the ~act that .
~hcn the anular protuberance 24 comes into contact, ... ~ith the shoulder 25, said protuberance is apt to .
. . support high axial loads.
urthermore, in c~.ntrast with other ~no~n stop ., ~ . , .- .
~ . devices, the device according to the invention does .
. no~ cause any increase of the axial dimension of the t~ machine on ~hich it is installed; in ~actJ the device according to the invention i8 accomodated entirely inside the casing of the ~lo~dy~amical cylinder. _ _ _._ __ .
.~
_, - . - .
.
.
, ... . . .
.
~ ormaIly, said movable plate is actuated by a ~lowdynamical cylinder controlling a kinematic toggle mechanism, which i9 apt to caase said plate to move ~rom a first position to a second po~ition, in which positions said plate is located, respecti-vely, at the mininal and the maximal distance ~rom said other plate. ~ .
lhe movable plate reaches the first of said - c -two positions when the kinematic tog~le mechanism is in its extended position, i. e. in a position in which some of the members which constitute said mecha-nism arrange themselve~ themselves in such a way as to originate sub3ta~tially a chain o~ support bars which are apt to support the high in~ection pressure~
which discharge themselves onto tho movable plate.
~ he travel of thi~ piate, which is necessary for moving it fxom said first position to said secona position, must be adjustable in accordance with the characteri~tic~ and dimensio~s of the mould mounted on the pres~, so that the above-mentioned second posi-tion must be variable to conform with the different conditions of operation of the machine.
In the prior ~rt machines, the adjustment of the travel of said plate, and consequently the fixing of said second po~ition, is obtained by acting on the hydraulic device which controls the flowdynamical cy~inder actuating the kinematic togOle device; in fact, by`discontinuing the feed of the ~orking fluid to the flowdynamical cylinder during the opening travel of the movable plate it i~ po~ible to stop the latter in a pre-established position. ~owever, the adjustment of the end of travel position o~ the movable plate, effected in the way described above, ~0367~7 presents some di~advantages. First of all, said po~ition cannot be fixed very precisely, nor is it possible to stop said plate alway~ in the same posi-tion dl~ring each opening cycle of the machine Furthermore, the stop of the movable plate thus obtained is not positive, that is to say that if external forces of a high value act on the plate, said plate does not maintain its position.
Also known are manually adjustable screw devices for adjusting the travel of such plates. Such devices comprise sub~tantially a threadad ~tem which is screwed in a nut rigidly connected to the frame of the machine and whose one end passes through a wall of the casing of the flowdynamicàl cylinder to act as a stop for the piston of said c~lindér; the position in which ~aid piston and, consequently, the movable platè are stopped can be varied by turning the threaded stem.
~ he device~ of this type present the disadvanta2e of having a very high axial dimension; in fact, said stem, which protrudes axially from the end of the flowdynamical cylinder, being provided with a smooth cylindrical portion which is apt to tra~erse the end wall of the ca~ing of said cylinder t has a length which is at leaæt twice aæ long as the length of the 103676q travel of the piston which it ha^s to stop.
The object of this invention is to provide a device for adjusting the opening travel of a mould holder unit of a machine for moulding plastic materials, which will allow to eliminate the disadvantages desribed above.
According to the present invention there is provided a device for adjusting the opening travel o a mould holder unit o machine for moulding plastic materials, comprising: a movable plate which is arranged to support a portion of tlle mould, said plate being movable, during the opening travel, from a first position, in which said mould is closed, to a second position in which said mould is open; a cvlinder comprising a piston movable in a casing and arranged to actuate said movable plate; a part rigidly connected to said piston; a member movable axially relative to the piston, and mounted on said part, fixable manually with respect to the piston and arranged to cooperate with a portion of said casing in order to stop the piston during said opening travel.
For a better understanding of the present invention, a particular embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:
FIGURE 1 is a longitudinal section of the device according to the invention;
FIGURE 2 is a partially sectional side elevation -103676~Z
of a mould holder unit of a machine for injection moulding of thermoplastic materials, provided with the device according to the invention, the mo~able platR of ~aid moulding press being shown in the first position described above;
~ IG~RE 3 is a side ele~ational view similar to that shown in ~g. 2, in which the~movable plate of the moulding press is ~hown in the second position described abo~e, in which said plate has been stopped by the device according to the invention.
Referring first to ~igures 2 and 3, a.machine for moulding thermoplastic materials is provided with a mould holder unit, indicated generally by the refe-rence ~umeral l, comprising a stationary plate (not shown) and a mo~able plate 3 slidable on cylindrical guides 4 which are supported by the frame 9 of the machine and betweèn which, in a way known in itself, may be mounted a mould (not shown).
The mo~able plate 3 is actuated by a flowdyna-mical cyiinder, indicated generally with the reference numeral 5, through a kinematic toggle mechanism indi-cated generally with the reference ~umeral 6; in the ca~e of the embodiment shown, said kinematic mechanism consists substantially of two unitsS each of which comprises a crank 7 hinged by means of a pivot 8 on the frame 9 and a pair of connection rods 12 and 13, 10367~7 one end of which being hinged on a pivot 14 of the crank 7, while the other ends are hinged on a movable frame lS and on the movable plate 3, respectively.
The movable rame 15 is fixed to one end of a stem 16 rigidl~ connected to a piston 17 of the flowdvnamical cylinder 5. This cylinder comprises also a casing 18 which has slidably mounted therein the piston 17 and is ixed to the frame 9 of the machine. The piston 17 defines, inside the casin~ 18, a pair of anular chambers 19 and 20, into each of which can be fed a pressurized fluid which causes the piston 17 to move in a predetermined direction, and from each o, which said fluid can be discharged.
~lounted on a machine o the specified type, known in itself, is a device according to the invention, shown in Fig. 1, which device comprises substantially a tubular element 21 (Fig. 1) movable axially on a cylindrical part 23 which is rigidly connected to the piston 17 and is disposed, with respect to the piston 17, at the side opposite the one at which the stem is situated.
The tubular element 21 is provided with an annular protuberance 24 having a shoulder 25 which is arranged ~' ` 1036~
to come into contact with a`correspondent shoulder formed o~ an e~d wall 26 of the casing 18 of the flowdynamical cylinder 5. ~he tubular element 21 i8 also provided with a scre~ nut 27 which is arranged to enga~e with a thread 28 formed on the end of the cylindrical part 23. The tubular element 21 can be rotated, in order to move it axially with respect to the cylindrical part 23, by grasping it, ~or example, at the radial holes 31, and can be fi~ed axially with respect to said cylindrical part by means of a threaded ring 32. Conveniently, but not iecessarily, the cylindrical part 23 is provided with an he~agonal end head 33 which is arranged to prevent said cylindrical part 23 from .
rotating when the hexagonal head is locked by means of a suitable key during the above-mentioned rotation of the tubular element 21 relative to said cylindrical parte.
Con~eniently, between the head 33 and the thread 28 there i~ disposed a resilient ring 34 which is apt to prevent the threaded ring 32 from being completely unscrewed from~ the thread.
Disposed outside the tubular element 21 is a substantially cyli~drical hou~ing 35 which is fastened, in any ~uitable way, to the wall 26 of the flowdynami-cal cylinder 5; o~ a threaded end portio~ of said - housing can be screwed a cover 36 provided with rib~
~0367~7 37 which are arranged to allow the unscrewing of said cover.
The operation of the device described in the foregoing takes place as follows.
~j Let us suppose that a pressurized fluid is fed into the ! interior of the chamber 19 (Figures 1, 3) of the flowdynamical ~, cylinder 5 and that other fluid is discharged from the chamber 20 of said cylinder, thereby cau~ing the piston 17 to move towards the right as seen in the Figures. It follows that both the stem 16 and the movable frame 15 (Figure 3) are displaced in th~ same direction and, starting from the position in which the moulding 3 press is shown in Fig 3, the frame 15, by exerting a thrust on 1 the connection rods 12, produces the rotation of the cranks 7 3 which control the rotation and translation of the connecting rods 13 to cause the kinematic toggle device 6 to assume its completely extended condition shown in Fig. 2. In such condition, the connecting rods 13 and the cranks 7 are substantially aligned and therefore constitute chains of support bars which are capable of supporting the high force which are applied on the movable plate 3 when the moulding press is closed. Thus, the movable plate 3 assumes a position, hereinafter called first position, in which . 1036767 it is situated closer to the ~tationary plate, and the mould, disposed between said two plates, i9 clo~ed; obviously, this position can be varied only by modi~ying the length of the various parts which constitute the toggles 6 (connecting rods 13 or cranks 7).
Sùppose no~ that, starting from said first posi-tion o~ the movable plate 3, the latter has to be moved to a se¢ond position through a prefixed travel beginning from the precedent position.
~ o obtain this i~ is sufficient, after having removed the co~er 36 (~ig. 1), to rotate the tubular element 21 with respect to the thread 28 of the cylindrical part 23; for carrying out said operation it is necessary to unscrew the ring 32 and, by means of a suitable key introduced into the holes 31, rotate the tubular element 21 while holding firmly, by means of another key, the head 33 of the cylindrical part 23. During the rotation of the tubular element 21 with respect to the thread 28 said tubular element i~ moved ~ially with respect to said thread, and ¢onsequently the piston 17 is di~placed axially with respect to the anular protuberance 24 of said tubular element. At the end of the operation, the ring 32 is scre~ed agai~ and the cover 36 is placed again.
Suppo~ing to have set, by the above described :
~03676`7 `
operation, a prefixed travel for the movable plate 3, if pressurized fluid is now introduced into the chamber 20 of the flowdynamical cylinder 5 and fluid is discharged from the other chamber 19, the piston is caused to move to the left as seen in the Figures. At thè end of the travel of the piston, the shoulder 25 of the annular protuberance 24 of the tubular element 21 stops against the corresponding shoulder of the wall 26. In this way, the stem 16 is stopped in a prefixed position to which corresponds said travel end position of the movable plate 3.
It is obvious, therefore, that by displacing, in the way ¦ described precedently, the annular protuberance 24 of the tubular element 21 with respect to the piston 17, pre-established travels ~¦ of the movable plate 3 with respect to the stationary plate are obtained. `~
It follows from the foregoing that the travel of the movable plate 3 can be set by means of the device according to the invention in a very simple and quick way, inasmuch as it is necessary only to act manually on the tubular element 21.
Furthermore, the position obtained is maintained with precision during each subsequent cycle of operation of the moulding press, ¦ without requiring further interventions of the operator or successive adjustments. Finally, , ` ` ^. ` 103676~ . -.
. . . . . - ........ . .
.
.. .. . . . . .
... . . . . .. . ..
.. , . . . ... ` . .: :
. . the stop obtainable with the device according to the so nvention i3 0~ the ~called po3itiYe type, that. i9 . . to ~ay that even under the aotion of high axial forces ; . . .
. ^ exexted on the movable plate 3, the abo~e mentioned ravël end posi~io~ is absolutely not subject to a~y .~ariationi obviously~ this depends upon ~the ~act that .
~hcn the anular protuberance 24 comes into contact, ... ~ith the shoulder 25, said protuberance is apt to .
. . support high axial loads.
urthermore, in c~.ntrast with other ~no~n stop ., ~ . , .- .
~ . devices, the device according to the invention does .
. no~ cause any increase of the axial dimension of the t~ machine on ~hich it is installed; in ~actJ the device according to the invention i8 accomodated entirely inside the casing of the ~lo~dy~amical cylinder. _ _ _._ __ .
.~
_, - . - .
.
.
, ... . . .
.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for adjusting the opening travel of a mould holder unit of machine for moulding plastic materials, comprising:
a movable plate which is arranged to support a portion of the mould, said plate being movable, during the opening travel, from a first position, in which said mould is closed, to a second position in which said mould is open;
a cylinder comprising a piston movable in a casing and arranged to actuate said movable plate;
a part rigidly connected to said piston;
a member movable axially relative to the piston, and mounted on said part, fixable manually with respect to the piston and arranged to cooperate with a portion of said casing in order to stop the piston during said opening travel.
a movable plate which is arranged to support a portion of the mould, said plate being movable, during the opening travel, from a first position, in which said mould is closed, to a second position in which said mould is open;
a cylinder comprising a piston movable in a casing and arranged to actuate said movable plate;
a part rigidly connected to said piston;
a member movable axially relative to the piston, and mounted on said part, fixable manually with respect to the piston and arranged to cooperate with a portion of said casing in order to stop the piston during said opening travel.
2.- The device of claim 1, wherein said piston is rigidly connected to an actuating stem, and said part rigidly connected to said piston protudes axially from said piston, with respect to it at the side which is opposite that from which said stem protudes, and is provided with a threaded portion on which is screwed a screw nut rigidly connected to said member movable axially relative to the piston, the displacement of said member movable axially being carried out by means of a relative rotation of said member with respect to said part rigidly connected to the piston.
3.- The device according of claim 1, wherein said casing of the cylinder is provided with an end wall, and said member movable axially is provided with an anular protuberance which is arranged to come into contact with a shoulder of said end wall in order to stop the piston during said opening travel.
4.- The device of claim 1, wherein said member movable axially is provided with means which are apt to allow rotation of said member with respect to said threaded portion and prevent it from being spontaneously unscrewed relative to said threaded portion.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1159773A CH557231A (en) | 1973-08-10 | 1973-08-10 | DEVICE TO ADJUST THE OPENING STROKE OF THE MOVABLE PLATE OF A MACHINE FOR MOLDING PLASTIC MATERIALS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1036767A true CA1036767A (en) | 1978-08-22 |
Family
ID=4375024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA205,275A Expired CA1036767A (en) | 1973-08-10 | 1974-07-22 | Device for adjusting the opening travel of the movable plate of a moulding machine for plastic materials |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5045040A (en) |
| BE (1) | BE818646A (en) |
| CA (1) | CA1036767A (en) |
| CH (1) | CH557231A (en) |
| DE (1) | DE2437671A1 (en) |
| ES (1) | ES429129A1 (en) |
| FR (1) | FR2240100A1 (en) |
| IT (1) | IT1020618B (en) |
| NL (1) | NL7410129A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60124227A (en) * | 1983-12-10 | 1985-07-03 | Fanuc Ltd | Nozzle touch driving gear |
-
1973
- 1973-08-10 CH CH1159773A patent/CH557231A/en not_active IP Right Cessation
-
1974
- 1974-05-16 IT IT6852674A patent/IT1020618B/en active
- 1974-07-22 CA CA205,275A patent/CA1036767A/en not_active Expired
- 1974-07-26 NL NL7410129A patent/NL7410129A/en not_active Application Discontinuation
- 1974-08-05 DE DE19742437671 patent/DE2437671A1/en not_active Withdrawn
- 1974-08-07 FR FR7427385A patent/FR2240100A1/en active Granted
- 1974-08-08 JP JP9142774A patent/JPS5045040A/ja active Pending
- 1974-08-09 BE BE2053801A patent/BE818646A/en unknown
- 1974-08-09 ES ES429129A patent/ES429129A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES429129A1 (en) | 1976-11-16 |
| JPS5045040A (en) | 1975-04-22 |
| FR2240100B1 (en) | 1979-08-03 |
| BE818646A (en) | 1974-12-02 |
| IT1020618B (en) | 1977-12-30 |
| DE2437671A1 (en) | 1975-02-20 |
| FR2240100A1 (en) | 1975-03-07 |
| NL7410129A (en) | 1975-02-12 |
| CH557231A (en) | 1974-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5238394A (en) | Mold clamping apparatus for molding apparatus | |
| US3926033A (en) | Toggle-joint press | |
| US6655673B2 (en) | Power clamp mechanism | |
| US4376744A (en) | Mechanical and fluid actuated ram for powder compacting press and method of compacting powder material | |
| CA1324160C (en) | Device for the adjustment of the rotary position of a cylinder of a turning apparatus and for the axial displacement of an actuator for the changeover of the grippers on said cylinder of a sheet-fed rotary printing press | |
| US5178888A (en) | Device for closing molds of an injection molding machine | |
| US5133655A (en) | Friction clamp for injection molding machine | |
| CA1244613A (en) | Clamp mechanism | |
| US5511963A (en) | Mold closing unit for use in an injection molding machine for processing synthetic materials | |
| CA1036767A (en) | Device for adjusting the opening travel of the movable plate of a moulding machine for plastic materials | |
| US5033955A (en) | Article mold handling apparatus | |
| US4222731A (en) | Molding press for plastic materials | |
| US6283906B1 (en) | Folding jaws cylinder | |
| US4025266A (en) | Injection molding machine | |
| US4020709A (en) | Device for adjusting the opening travel of the movable plate of a molding machine for plastic materials | |
| US3914087A (en) | Device for adjusting the opening travel of the movable plate of a moulding machine for plastic materials | |
| US4216876A (en) | Pressure operated coupler | |
| SU1283025A1 (en) | Device for clamping machined articles | |
| US4592713A (en) | Mold closing unit of an injection molding machine | |
| ITTO930197A1 (en) | INJECTION MOLDING MACHINE. | |
| JPH03128222A (en) | Mold clamping device for injection molder | |
| US4463627A (en) | Piston and cylinder assembly for blockade arm | |
| JPH0560108A (en) | Cylinder device | |
| JP3195549B2 (en) | Table drive of molding machine | |
| US4238174A (en) | Rimless, production mold |