EP1650050B1 - Assembly for supplying compressed air to an embossing device - Google Patents
Assembly for supplying compressed air to an embossing device Download PDFInfo
- Publication number
- EP1650050B1 EP1650050B1 EP20050108868 EP05108868A EP1650050B1 EP 1650050 B1 EP1650050 B1 EP 1650050B1 EP 20050108868 EP20050108868 EP 20050108868 EP 05108868 A EP05108868 A EP 05108868A EP 1650050 B1 EP1650050 B1 EP 1650050B1
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- EP
- European Patent Office
- Prior art keywords
- valve
- housing
- embossing device
- unit
- compressed air
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- 238000004049 embossing Methods 0.000 title claims description 112
- 238000007789 sealing Methods 0.000 claims description 6
- 238000013022 venting Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000000994 depressogenic effect Effects 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims 5
- 238000010304 firing Methods 0.000 description 33
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000011022 operating instruction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
Definitions
- the present invention relates to a unit for connecting compressed air for a compressed air supply embossing device, according to the preamble of claim 1, and an embossing device with such a unit.
- the known embossing device has a relation to the die 3 arranged displaceable firing pin 4, which is spaced in the "sharp" state of the embossing device with its face 4 'of the impact surface 3' of the die 3, wherein the Impact bolt 4 in the opposite direction of the face 4 'facing, for striking the firing pin 4 on the impact surface 3' of the die bolt 3 acted upon with compressed air working surface 4 "The firing pin 4 limited on the one hand with its club face 4 'an expansion space 6 and on the other hand with its working surface
- the embossing punch 1 and the firing pin 4 are arranged in a common, hand-gras
- the operation of the known embossing device is as follows. After (one-time) connection of the compressed air passes through the gap 2 between the firing pin 4 and the tubular housing 8 from the working space 7 in the expansion space 6 and presses the punch 3 with the seal of the sealing valve 5 against the housing 8. Since same pressure in Expansion space 6 and in the working space 7 is present, the return spring 11 forces the firing pin 4 in the rear, in the Fig. 1 illustrated basic position. The embossing device is thus "sharp".
- the Stem stamp 3 pushed back and the pressure in the expansion chamber 6 can escape very quickly through the now open seal valve 5 and not shown by lateral holes in the front head 9 of the embossing device.
- the gap 2 between the firing pin 4 and the housing 8 is only very small, and therefore the compressed air can not pass fast enough past the firing pin 4 in the expansion space 6 of the housing 8. Consequently, the firing pin 4 is thrown against the weak return spring 11 forward against the die 3, where it hits the die 3 as a hammer, and the total impact energy is transferred via the die 1 on the workpiece to effect the stamping.
- the US 2 457 930 A discloses a unit for the connection of compressed air as a component of a device for inserting shock absorption pads, which is arranged a hand-engageable tubular housing in which a pressurizable with the compressed air pin in the longitudinal direction of the housing, a valve for alternately blocking and releasing the compressed air supply the embossing device and a valve operating member cooperating with the valve, which comprises a hand contact part arranged externally on the housing, which is resiliently biased into a rest position in which the valve is closed, and which is adapted, when grasping the embossing device, by hand into a Open position in which the valve is open.
- the bolt is a striker which separates the housing into a working space and an expansion space and that a valve is provided for blow-releasing venting of the expansion space.
- the object of the invention is to reliably prevent false triggering of a pneumatic embossing device.
- the invention is based on the finding that the security problems described above are associated with the circumstance that in the known embossing device the "sharp" pressurized state can exist without the device being picked up.
- An inventively equipped embossing device has improved reliability, since they can be placed only consciously and with proper handling in a "sharp" pressurized state.
- the invention not only reduces risks that arise when unconsciously handling the device, but also risks due to deliberate disregard of the operating instructions, as there are fewer opportunities to "fool around" with the device. Even with adjustments (eg changing the stamping die), if the device is held in a different manner than during stamping work and this may not be separated from the compressed air source, creating a dangerous situation in the conventional construction, this danger situation by the invention significantly reduced.
- the opening position (the “sharp” state) is given by a position of the hand contact part directed towards the housing, and in particular when the valve actuating member is a lever having a longitudinally extending on the housing elongated arm, which forms the hand-contact part and is preferably movable transversely to the housing.
- valve actuator does not have to be a lever, but may, for example, have a flat mushroom-shaped head as a hand-contact part, which protrudes somewhat from the housing at a location where the embossing device is to be gripped with proper handling and operates the valve as it is pushed in.
- embossing devices Another problem with known embossing devices is that after triggering a regular strike the firing pin 4 is front and in the working chamber 7 and expansion chamber 6 full system pressure prevails. After removal of the compressed air source from the embossing device, this system pressure must be completely relieved and the firing pin 4 must again be in the rear basic position Fig. 1 stand before the safe state is restored. Since compressed air flowing in from the working space 7 pushes the embossing punch bolt 3 forward again immediately after lifting the embossing punch 1 from the workpiece and closes the expansion space 6, the system pressure builds up again in the working space 7 and in the expansion space 6 before the compressed-air source is disconnected. Thus, the embossing device is again sharp despite the compressed air source and precautions must be taken to reduce this pressure again.
- FIGS. 2 to 2B there is shown a first embodiment of an improved safety embossing apparatus in accordance with the present invention, wherein the front portion including the embossing punch, stamper and head has been omitted for simplicity.
- the rear portion 22 of the embossing device comprising the tubular housing 8, the working space 7, the firing pin 4 with its face 4 'and its pressurizable working surface 4 ", the gap 2, the return spring 11 and the expansion space 6 (which is only partially shown ) corresponds to the rear section of the DE 37 39 539 C2 known device and will not be explained further here.
- the mode of action of the sections is similar to that DE 37 39 539 C2 and is therefore omitted to avoid repetition.
- a unit generally designated by reference numeral 20, interposed between a nozzle 21 for the supply of compressed air and the rear portion 22 of the stamping device.
- the unit 20 which may be formed separately from the rear portion 22, is in place 46 sealingly connected to this.
- the unit 20 comprises a hand-operated valve, which is formed by a plunger 24 and a seal 25 and is actuated by a lever 23.
- the lever 23 has an ergonomically shaped arm 23 'which constitutes a hand contact part and is pivotally mounted on an axle 26 in the unit 20 and can be moved by a lever slot 27 in the unit 20 along the direction of the housing axis to the plunger 24th to apply a linear movement along the housing axis.
- the plunger 24 is pressed by a first compression spring 28, so that in the rest position, the seal 25 seals the valve seat 29.
- the valve seat 29 surrounds, as in the FIGS. 2A and 2B can be seen, at least one compressed air bore 30 and a plunger bore 31, which are formed in the unit 20.
- a further compressed air bore 30 ' is shown, wherein the compressed air bores 30 and 30' are arranged symmetrically to the lever slot 27.
- the compressed air holes 30 and 30 ' provide in the open state of the hand-operated valve, a passage available through which the compressed air from the compressed air source (not shown) in the working space 7 and the expansion space 6 of the embossing device can penetrate.
- a breather valve comprising a breather seal 32 and a second compression spring 33 disposed between the breather seal 32 and a projection 34 of the lever 23, the breather seal 32 being formed with a vent 35 in FIG complete the rear section 22 of the embossing device.
- the vent opening 35 can also be provided in the unit 20, in which case the lever arrangement is correspondingly kinematically adapted. In the latter variant it is avoided that the housing 8 of the embossing device in the event of retrofitting a conventional embossing device subsequently is bored.
- the operation of the improved safety stamping device according to the first embodiment of the invention is as follows. At rest, the hand-operated valve is closed, so that the compressed air can not penetrate into the working space 7 of the device. If the embossing device is taken by a user in the hand, this, in order to connect the compressed air supply, the lever 23 manually press in the direction of the housing 8 to move the plunger 24 against the pressure of the first compression spring 28 in the direction of the nozzle 21 and to separate the seal 25 connected to the plunger 24 from the valve seat 29. Thus, the path for the compressed air through the compressed air holes 30 and 30 'in the working space 7 of the embossing device is released and this, as described in connection with the prior art, made "sharp".
- the "crisp" pressurized state can be avoided when the device is picked up without being deliberately set to a “sharp” pressurized state.
- the bleed valve In the event that the bleed valve is present, it operates countercyclically to the hand-operated valve, so that the bleed valve is closed when the lever 23 is pressed in the direction of the housing 8 to open the hand-operated valve, and is opened, to ensure a rapid pressure reduction in the working space 7 or in the unit 20 (if the vent opening is present in this), when the lever 23 in its rest position of the Fig. 2 , away from the housing 8, returns.
- the embossing device with improved safety can again be completely "blurred" when the compressed air supply is deliberately switched off by the user.
- FIG. 2C A modification of the first embodiment of Fig. 2 is in Fig. 2C shown, with the only difference to this embodiment, the vent seal 32 and the second compression spring 33 are combined into a part whose elasticity is sufficient as a "travel". Also in this modification can advantageously be provided in the case of the retrofitting of conventional embossing devices, the vent opening 35 in the unit 20, in which case the lever assembly is accordingly kinematically adapt.
- FIG. 3 A second embodiment of the embossing device with improved safety is explained. Basically, the second embodiment is similar to the first embodiment. Therefore, only the features deviating from the first embodiment will be described and denoted by different reference numerals.
- a spool valve 40 is used, which is movable in the unit 20 in a corresponding bore 43 perpendicular to the housing axis.
- the slide valve 40 is analogous to the valve of the first embodiment by the third compression spring 44 in its rest position, as in the Fig. 3 shown, pressed, so that the compressed air supply from the nozzle 21 to the working space 7 is interrupted. If, by manual pressure on the arm 23 ', the lever 23 is pivoted in the direction of the housing 8 about the axis 41 and the slide valve 40 assumes a lower position in the bore 43, compressed air can flow past the groove 42 into the working space 7. The lever 23 returns to its rest position by the action of the third compression spring 44 when the manual pressure is released.
- the vent valve operates countercyclically analogous to the vent valve to the first embodiment.
- Fig. 4 is a third embodiment of Embossing device with improved safety of the invention explained.
- the third embodiment is similar to the second embodiment of the invention, except that the vent valve has been omitted.
- the fourth embodiment is similar to the second embodiment except that the bleed valve is implemented in the spool valve 40.
- the passages 47 and 48 in conjunction with the lower portion 49 of the spool valve 40, form a vent valve that operates counter-cyclically to the spool valve, obstructing the path from the working space 7 to the outside through the passages 47 and 48 through the lower portion of the spool valve 40, when the slide valve 40 opens by pressing the lever 23 downwards in the direction of the housing 8.
- the path from the working space 7 to the outside via the passages 47 and 48 is opened when the slide valve 40 returns to its rest position.
- the fifth embodiment of the third embodiment of the invention resembles the Fig. 4 Apart from the fact that for venting the working space 7 at least one opening 50 in the annular housing 8 in the height of the firing pin 4 in the rear basic position of Fig. 1 is provided.
- the opening 50 is dimensioned on the one hand, taking account of the gap 2, that in the "sharp" pressurized state of the embossing device, a relatively small amount of compressed air can escape and that the pressure drop in the working chamber 7 and expansion chamber 6 can be easily compensated.
- the opening 50 is dimensioned so that after triggering the embossing process, when the firing pin 4 is thrown forward, the Compressed air from the working space 7 can escape in a few seconds to restore the safe state quickly. Furthermore, the unwanted shock triggering is already inhibited by the opening 50 to the outside already when operating the valve 40 for the compressed air inlet in the following manner: As soon as the firing pin 4 moves slightly forward, it releases the opening 50 to the outside and the incoming air can escape from the working space 7. This function is more effective, the slower the compressed air flows. Since the system pressure builds up gradually over the gap 2, also in the expansion space 6, the firing pin 4 returns to the rear basic position and "closes" the opening 50 again. The embossing device is now armed when the valve is manually operated. The solution approach with the opening 50 can also in connection with the first embodiment of Fig. 2 are used, by the omission of the vent seal 32 and the second compression spring 33rd
- the lever 23 has two arms 23 ', 23 "on opposite sides of the axis 41', namely an arm 23 ', which represents the hand-contact part, and an arm 23", which is connected to a slide valve 40', which in a mating bore extends in the rear portion 22 'of the embossing device, which extends transversely to the longitudinal direction of the embossing device to the air supply opening 21'.
- the lever 23 is held by a spring, not shown, normally in a position spaced from the housing 8 rest position in which the air supply opening 21 'is closed by the slide valve 40'.
- the gate valve 40' is opened.
- an opening 50 'in the housing 8 at the level of the position of the rear basic position of the firing pin 4 is provided, which can escape after the blow and the only then completed closure of the compressed air connection by releasing the hand lever continues to prevail in the interior of the embossing system system pressure to the outside the embossing device is no longer "sharp". Even if the firing pin 4 obscures the opening 50 ', there is no complete closure of the opening 50' because of the gap 2, but this leakage is extremely low because of the very small gap size and anyway only lasts until the impact is triggered, ie it can be out of air consumption To be considered.
- FIGS. 8 and 9 show additional measures in the head area of the housing 8, which can be made in all the embodiments described above, to prevent unwanted shock triggering even under special circumstances such as dynamic movements of the embossing device.
- the embossing punch bolt 3 is driven forward by a helical spring 60 which extends between the head 9 of the embossing device and a locking nut 14 for the embossing punch 1 around the embossing punch 3, ie, in the longitudinal direction of the housing 8 to the outside, so that the expansion space. 6 is securely sealed by the non-illustrated seal on the stamping punch 3 and is always opened only when the embossing device is pressed against a workpiece.
- a return spring 11 'for the firing pin 4 which is tapered at the front to attack behind the stamping punch bolt 3 and to drive it forward.
- the return spring 11 'of Fig. 9 can also be installed in isolation without the hand-operated valve or the slide valve in embossing device in which Locking and releasing the compressed air supply for other considerations (eg due to further mechanical safety precautions) is not required.
- FIGS. 8 and 9 shown constructive additions have the consequence that the expansion chamber 6 is securely sealed even in any working position of the embossing device (in particular built-in appliances are often installed hitting upwards vertically). If now the compressed air is switched by a manually operated valve from the rear, although the firing pin 4 is first pressed forward, but it must compress the air in the expansion space 6 and is thereby braked. When the pressure at the front has reached the system pressure, then outweighs the force of the return spring 60 and 11 'for the firing pin 4.
- the working space volumes front and rear, the gap 2 of the firing pin 4 to the tubular housing 8, the free path lengths front and rear and the characteristic of the return spring 60 and 11 ' are coordinated so that in the entire working pressure range up to 6 bar, at any position of the embossing device to gravity and for any rapid connection of the compressed air of the firing pin 4 under any circumstances until the die 3 after can be moved forward.
- This front, position-independent closure of the working space has the advantage, in particular with built-in appliances, that the systems become insensitive to slow pressure build-up when first switched on.
- This is relatively common because built-in devices often have long installation lines with multiple devices and / or other consumers.
- the embossing punch bolt 3 does not close, as in the case of a rapid rise, but very often a noisy oscillation occurs (vibration of the embossing punch bolt 3 directly in front of the outlet opening) quite similar to that of a wind instrument with a reed.
- the return spring for the embossing punch 3 is not executed as a separate spring, but in the form of a taper of the already existing return spring 11 'for the return of the firing pin 4.
- This variant has the advantage that a spring break almost always affected the normal work function and thus immediately noticed.
- valve 24, 25 or 40 and / or valve actuator 23 which provide a defined delayed opening rate by not directly effecting the valve opening but being released by another source of energy.
- a valve 24, 25 or 40 and / or valve actuator 23 which provide a defined delayed opening rate by not directly effecting the valve opening but being released by another source of energy.
- the other source of energy for actuation may be, for example, a preloaded spring or the compressed air supply itself. In this design principle is achieved on the constructive forced gradual opening of the compressed air supply of the working chamber 7, that builds on the gap 2, the pressure in the expansion chamber 6 and the firing pin 4 only undergoes a slight acceleration or movement performs.
- FIG. 10 An embodiment of such a delayed valve opening is in the Fig. 10 shown.
- This embodiment is similar to the third embodiment of FIG Fig. 4 but with a spool valve 40 "substantially integral with a seal 62 airtight in the opening 43 sits.
- the lever 23 acts here not directly on the slide valve 40 ", but via a spring 63.
- the slide valve 40" Upon actuation of the lever 23, the slide valve 40" is pressed into the more or less closed, formed as a blind hole space 64 under the slide valve 40 " very small vent hole 65 of the space 64 still allows some air to escape to the outside, the groove 42 'in the upper part of the spool valve 40 "the air access to the working space 7 only gradually and not abruptly releases, regardless of the operating speed of the lever 23.
- a return spring 66 in the blind hole brings the spool valve 40 "back to the starting position when the lever 23 is released because the spring 63 is so short that it no longer acts when the lever 23 is released ..
- the vent hole 65 could also fit between spool valve 40 "and opening 43 are dimensioned so that thereby the air escapes gradually. This eliminates the seal 62, but requires higher manufacturing accuracy.
- check valves 70 it is expedient to carry out such air outlets in the head region of the housing 8 as check valves 70, as in the Fig. 11 shown.
- check valves 70 can at the return stroke of the firing pin 4 at any time air flow into the housing 8, but they close during the forward stroke of the firing pin 4, so that the Clearschlag inhibiting air cushion anyway can build up.
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Description
Die vorliegende Erfindung betrifft eine Einheit zur Zuschaltung von Druckluft für eine Prägevorrichtung mit Druckluftzufuhr, gemäß dem Oberbegriff von Anspruch 1, und eine Prägevorrichtung mit so einer Einheit.The present invention relates to a unit for connecting compressed air for a compressed air supply embossing device, according to the preamble of claim 1, and an embossing device with such a unit.
Aus der
Die Wirkungsweise der bekannten Prägevorrichtung ist wie folgt. Nach (einmaligem) Anschließen der Druckluft gelangt Luft über den Spalt 2 zwischen dem Schlagbolzen 4 und dem rohrförmigen Gehäuse 8 aus dem Arbeitsraum 7 in den Expansionsraum 6 und drückt den Prägestempelbolzen 3 mit der Dichtung des Dichtungsventils 5 gegen das Gehäuse 8. Da gleicher Druck im Expansionsraum 6 und im Arbeitsraum 7 vorhanden ist, zwingt die Rückstellfeder 11 den Schlagbolzen 4 in die hintere, in der
Der Umstand, dass die Stempelung genau dann erfolgt, wenn die Prägevorrichtung gegen ein Werkstück gedrückt wird, verleiht der Prägevorrichtung theoretisch eine inhärente Sicherheit gegen Fehlauslösungen, die bislang für ausreichend erachtet wurde.The fact that the stamping occurs precisely when the embossing device is pressed against a workpiece theoretically gives the embossing device inherent security against false triggering, which has heretofore been considered sufficient.
Mit der Zeit hat sich jedoch herausgestellt, dass in der Praxis gefährliche Situationen auftreten oder sogar Unfälle geschehen können, insbesondere bei nachlässigem Umgang mit dem Gerät, bei unbeabsichtigter, fahrlässiger oder gar bewusster Missachtung der Betriebanleitung und ihren Sicherheitsanweisungen, in ungewöhnlichen Arbeitssituationen, in Schrecksituationen, bei äußeren Ablenkungen und bei Einstellarbeiten, für die das Gerät nicht vollständig von der Druckluftzufuhr getrennt werden kann.Over time, however, it has been found that in practice dangerous situations occur or even accidents can happen, especially in careless handling of the device, in case of accidental, negligent or even deliberate disregard of the operating instructions and their safety instructions, in unusual work situations, in frightening situations, in case of external distractions and adjustments, for which the device can not be completely disconnected from the compressed air supply.
Aus der
Die
Aufgabe der Erfindung ist es, Fehlauslösungen einer pneumatischen Prägevorrichtung zuverlässig zu verhindern.The object of the invention is to reliably prevent false triggering of a pneumatic embossing device.
Die obige Aufgabe wird durch eine Einheit zur Zuschaltung von Druckluft gemäß Anspruch 1 und eine Prägevorrichtung gemäß Anspruch 12 gelöst.The above object is achieved by a unit for connecting compressed air according to claim 1 and an embossing device according to claim 12.
Der Erfindung liegt die Erkenntnis zu Grunde, dass die oben beschriebenen Sicherheitsprobleme im Zusammenhang mit dem Umstand stehen, dass bei der bekannten Prägevorrichtung der "scharfe" druckbeaufschlagte Zustand bestehen kann, ohne dass die Vorrichtung in die Hand genommen wird.The invention is based on the finding that the security problems described above are associated with the circumstance that in the known embossing device the "sharp" pressurized state can exist without the device being picked up.
Eine erfindungsgemäß ausgerüstete Prägevorrichtung verfügt über verbesserte Betriebssicherheit, da sie nur bewusst und bei sachgemäßer Handhabung in einen "scharfen" druckbeaufschlagten Zustand versetzt werden kann.An inventively equipped embossing device has improved reliability, since they can be placed only consciously and with proper handling in a "sharp" pressurized state.
Die Erfindung vermindert nicht nur Risiken, die bei unbewusst falschem Umgang mit dem Gerät entstehen, sondern auch Risiken aufgrund von bewusster Missachtung der Betriebsanleitung, da es weniger Möglichkeiten gibt, mit dem Gerät "herumzuspielen". Auch bei Einstellarbeiten (z. B. Wechsel des Prägestempels), wenn das Gerät auf andere Weise festgehalten wird als bei Prägearbeiten und hierbei unter Umständen nicht von der Druckluftquelle getrennt wird, wodurch bei der herkömmlichen Bauweise eine Gefahrensituation entsteht, wird diese Gefahrensituation durch die Erfindung wesentlich reduziert.The invention not only reduces risks that arise when unconsciously handling the device, but also risks due to deliberate disregard of the operating instructions, as there are fewer opportunities to "fool around" with the device. Even with adjustments (eg changing the stamping die), if the device is held in a different manner than during stamping work and this may not be separated from the compressed air source, creating a dangerous situation in the conventional construction, this danger situation by the invention significantly reduced.
Sicherheitstechnisch und ergonomisch günstig ist es, wenn die Ruhestellung (der "unscharfe" Zustand) durch eine vom Gehäuse weg gerichtete Lage des Handkontaktteils gegeben ist und die Öffhungsstellung (der "scharfe" Zustand) durch eine zum Gehäuse hin gerichtete Lage des Handkontaktteils gegeben ist, und insbesondere wenn das Ventilbetätigungsglied ein Hebel ist, der einen vorzugsweise in Längsrichtung am Gehäuse verlaufenden länglichen Arm aufweist, der den Handkontaktteil bildet und vorzugsweise quer zum Gehäuse beweglich ist.In terms of safety and ergonomics, when the rest position (the "blurred" state) is given by a position of the hand contact part directed away from the housing, the opening position (the "sharp" state) is given by a position of the hand contact part directed towards the housing, and in particular when the valve actuating member is a lever having a longitudinally extending on the housing elongated arm, which forms the hand-contact part and is preferably movable transversely to the housing.
Das Ventilbetätigungsglied muss aber kein Hebel sein, sondern kann zum Beispiel einen flachen pilzförmigen Kopf als Handkontaktteil haben, der an einer Stelle, an der die Prägevorrichtung bei korrekter Handhabung zu ergreifen ist, etwas von dem Gehäuse vorsteht und beim Hineindrücken das Ventil betätigt.However, the valve actuator does not have to be a lever, but may, for example, have a flat mushroom-shaped head as a hand-contact part, which protrudes somewhat from the housing at a location where the embossing device is to be gripped with proper handling and operates the valve as it is pushed in.
Ein weiteres Problem bei bekannten Prägevorrichtungen besteht darin, dass nach Auslösung eines regulären Schlages der Schlagbolzen 4 vorne ist und im Arbeitsraum 7 und Expansionsraum 6 voller Systemdruck herrscht. Dieser Systemdruck muss nach Abtrennen der Druckluftquelle von der Prägevorrichtung wieder vollständig abgebaut sein und der Schlagbolzen 4 wieder in der hinteren Grundstellung der
Dieses Problem wird durch die in den Ansprüchen 7 bis 11 angegebenen Weiterbildungen der Erfindung gelöst, die einen schnellen Druckabbau im vorstehend geschilderten Zustand ermöglichen.This problem is solved by the specified in the
Wenn man die Einheit zur Zuschaltung von Druckluft als separates Bauteil ausbildet, welches an Stelle des bisherigen Luftzufuhrteils mit einer vorhandenen bekannten Prägevorrichtung verbunden werden kann, werden bestehende Prägevorrichtungen aus dem Stand der Technik mit der Erfindung nachrüstbar. Das heißt, man erhält die oben geschilderten Sicherheitsmerkmale zur bewussten Druckbeaufschlagung und zum schnellen Druckabbau in Alleinstellung oder in Kombination, ohne dass man ein neues Gerät anschaffen muss.If one forms the unit for connecting compressed air as a separate component, which instead of the previous air supply part with an existing known embossing device can be connected, existing embossing devices of the prior art can be retrofitted with the invention. This means that you get the above-described security features for deliberate pressurization and rapid pressure reduction alone or in combination, without having to buy a new device.
Die oben geschilderten Sicherheitsmerkmale sind besonders relevant bei Hand-Prägevorrichtungen, sie können aber auch bei stationär eingebauten Prägevorrichtungen zweckmäßig sein.The above-described security features are particularly relevant in manual embossing devices, but they may also be useful in stationary embossing devices.
Bei der Erfindung besteht allerdings folgendes Problem. Der gesamte Arbeitsraum 7 innerhalb des Gehäuses 8 ist im normalen Bereitschaftszustand drucklos. Hierdurch ist die Lage des beweglichen Prägestempelbolzens 3 nicht eindeutig, sondern hängt von der Lage der Prägevorrichtung und den damit gemachten (dynamischen) Bewegungen ab. Die Öffnungsgeschwindigkeit eines handbetätigten Ventils ist nicht definiert. Wenn aber die Öffnungsbewegung relativ zügig erfolgt, tritt derselbe Effekt ein, wie er bei Prägevorrichtungen nach dem Stand der Technik beim erstmaligen Anschließen der Druckluftzufuhr auftritt und für sichere Handhabung zu berücksichtigen ist: Da vorne im Gehäuse 8 kein Druck herrscht, hinten aber sehr schnell Druck aufgebaut wird, wird ein regulärer Schlag ausgelöst, unabhängig davon, ob die Prägevorrichtung auf ein Werkstück aufgesetzt ist oder nicht. Da die Lage des Prägestempelbolzens 3 undefiniert ist, besteht sogar die Möglichkeit, dass aus dem vorderen Arbeitsraum Luft entweichen kann; hierdurch wird der Schlag besonders stark.In the invention, however, there is the following problem. The
Dieses Problem wird bei einer erfindungsgemäßen Prägevorrichtung mit Druckluftantrieb dadurch gelöst, dass man eine Feder vorsieht, die den Prägestempelbolzen dauernd nach vorne drückt.This problem is solved in a stamping device according to the invention with compressed air drive in that it provides a spring that presses the stamping punch constantly forward.
Weitere Merkmale und Vorteile der vorliegenden Erfindung sowie die Wirkungsweise verschiedener Ausführungsformen der vorliegenden Erfindung werden unten mit Bezug auf die begleitenden Zeichnungen beschrieben. Die begleitenden Zeichnungen veranschaulichen die vorliegende Erfindung und dienen zusammen mit der Beschreibung weiterhin dazu, die Grundsätze der Erfindung zu erklären und es einem Fachmann auf dem betreffenden Gebiet zu ermöglichen, die Erfindung herzustellen und zu verwenden. Dabei zeigen:
-
Fig. 1 eine schematische Ansicht einer bekannten Prägevorrichtung gemäß derDE 37 39 539 C2 -
Fig. 2 eine schematische Ansicht einer Prägevorrichtung mit verbesserter Sicherheit in Übereinstimmung mit einer ersten Ausführungsform der vorliegenden Erfindung; -
Fig. 2A eine Schnittansicht entlang der Ebene A-A derFig. 2 ; -
Fig. 2B eine Schnittansicht entlang der Ebene B-B derFig. 2 ; -
Fig. 2C eine schematische Ansicht einer Prägevorrichtung mit verbesserter Sicherheit in Übereinstimmung mit einer Abwandlung der ersten Ausführungsform der vorliegenden Erfindung; -
Fig. 3 eine schematische Ansicht einer Prägevorrichtung mit verbesserter Sicherheit in Übereinstimmung mit einer zweiten Ausführungsform der vorliegenden Erfindung; -
Fig. 4 eine schematische Ansicht einer Prägevorrichtung mit verbesserter Sicherheit in Übereinstimmung mit einer dritten Ausführungsform der vorliegenden Erfindung; -
Fig. 5 eine schematische Ansicht einer Prägevorrichtung mit verbesserter Sicherheit in Übereinstimmung mit einer vierten Ausführungsform der vorliegenden Erfindung; -
Fig. 6 eine schematische Ansicht einer Prägevorrichtung mit verbesserter Sicherheit in Übereinstimmung mit einer fünften Ausführungsform der vorliegenden Erfindung; -
Fig. 7 eine schematische Ansicht einer Prägevorrichtung mit verbesserter Sicherheit in Übereinstimmung mit einer sechsten Ausführungsform der vorliegenden Erfindung; -
undFiguren 89 schematische Teilansichten von Prägevorrichtungen in Übereinstimmung mit einer der Ausführungsformen eins bis sechs, die jeweils einen federnd vorgespannten Prägestempelbolzen aufweisen; -
Fig. 10 eine schematische Teilansicht einer Prägevorrichtung, die ein Luftzufuhrventil mit definiert verzögerter Öffnungsgeschwindigkeit aufweist; und -
Fig. 11 eine schematische Teilansicht einer Prägevorrichtung in Übereinstimmung mit einer der Ausführungsformen eins bis sechs, die Rückschlagventile im Kopfbereich des Gehäuses aufweist.
-
Fig. 1 a schematic view of a known embossing device according to theDE 37 39 539 C2 -
Fig. 2 a schematic view of an embossing device with improved safety in accordance with a first embodiment of the present invention; -
Fig. 2A a sectional view taken along the plane AA ofFig. 2 ; -
Fig. 2B a sectional view taken along the plane BB ofFig. 2 ; -
Fig. 2C a schematic view of an embossing device with improved safety in accordance with a modification of the first embodiment of the present invention; -
Fig. 3 a schematic view of an embossing device with improved safety in accordance with a second embodiment of the present invention; -
Fig. 4 a schematic view of an embossing device with improved safety in accordance with a third embodiment of the present invention; -
Fig. 5 a schematic view of an embossing device with improved safety in accordance with a fourth embodiment of the present invention; -
Fig. 6 a schematic view of an embossing device with improved safety in accordance with a fifth embodiment of the present invention; -
Fig. 7 a schematic view of an embossing device with improved Security in accordance with a sixth embodiment of the present invention; -
FIGS. 8 and9 schematic partial views of stamping devices in accordance with one of the embodiments one to six, each having a resiliently biased stamping punch bolt; -
Fig. 10 a schematic partial view of an embossing device having an air supply valve with a defined delayed opening speed; and -
Fig. 11 a schematic partial view of an embossing device in accordance with one of the embodiments one to six, having check valves in the head region of the housing.
Unter Bezugnahme auf die
Erfindungsgemäß wird eine allgemein mit Bezugszeichen 20 bezeichnete Einheit bereitgestellt, die zwischen einem Stutzen 21 für die Druckluftzufuhr und dem hinteren Abschnitt 22 der Prägevorrichtung zwischengeschaltet ist. Die Einheit 20, die getrennt vom hinteren Abschnitt 22 ausgebildet werden kann, ist an der Stelle 46 mit diesem abdichtend verbunden. Die Einheit 20 umfasst ein Hand-betätigtes Ventil, das aus einem Stößel 24 und einer Dichtung 25 gebildet ist und durch einen Hebel 23 betätigt wird. Der Hebel 23 hat einen ergonomisch geformten Arm 23', der einen Handkontaktteil darstellt, und ist schwenkbar an einer Achse 26 in der Einheit 20 gelagert und kann durch einen Hebelschlitz 27 in der Einheit 20 entlang der Richtung der Gehäuseachse bewegt werden, um den Stößel 24 mit einer linearen Bewegung entlang der Gehäuseachse zu beaufschlagen. Der Stößel 24 wird von einer ersten Druckfeder 28 gedrückt, so dass in der Ruhestellung die Dichtung 25 den Ventilsitz 29 abdichtet. Der Ventilsitz 29 umgibt, wie in der
Nach einem besonders bevorzugten Aspekt der vorliegenden Erfindung wird noch ein Entlüftungsventil bereitgestellt, umfassend eine Entlüftungsdichtung 32 und eine zweite Druckfeder 33, die zwischen der Entlüftungsdichtung 32 und einem Vorsprung 34 des Hebels 23 angeordnet ist, wobei die Entlüftungsdichtung 32 ausgebildet ist, eine Entlüftungsöffnung 35 im hinteren Abschnitt 22 der Prägevorrichtung abzuschließen. Nach einem weiteren Aspekt der Erfindung kann die Entlüftungsöffnung 35 auch in der Einheit 20 bereitgestellt werden, wobei dann die Hebelanordnung dementsprechend kinematisch anzupassen ist. Bei letzterer Variante wird vermieden, dass das Gehäuse 8 der Prägevorrichtung im Falle einer Nachrüstung einer herkömmlichen Prägevorrichtung nachträglich aufgebohrt wird.According to a particularly preferred aspect of the present invention, there is further provided a breather valve comprising a
Die Wirkungsweise der Prägevorrichtung mit verbesserter Sicherheit gemäß der ersten Ausführungsform der Erfindung ist wie folgt. Im Ruhezustand ist das Hand-betätigte Ventil geschlossen, so dass die Druckluft nicht in den Arbeitsraum 7 der Vorrichtung dringen kann. Wenn die Prägevorrichtung durch einen Benutzer in die Hand genommen wird, muss dieser, um die Druckluftzufuhr zuzuschalten, den Hebel 23 manuell in Richtung des Gehäuses 8 drücken, um den Stößel 24 gegen den Druck der ersten Druckfeder 28 in Richtung des Stutzens 21 zu bewegen und um die mit dem Stößel 24 verbundene Dichtung 25 vom Ventilsitz 29 zu trennen. Somit wird der Weg für die Druckluft durch die Druckluft-Bohrungen 30 und 30' in den Arbeitsraum 7 der Prägevorrichtung freigegeben und diese wird, wie in Verbindung mit dem Stand der Technik beschrieben, "scharf" gemacht. Somit kann der "scharfe" druckbeaufschlagte Zustand vermieden werden, wenn die Vorrichtung in die Hand genommen wird, ohne bewusst in einen "scharfen" druckbeaufschlagten Zustand versetzt zu werden. Nach Wegnahme des manuellen Drucks vom Hebel 23 kehrt dieser unter Einwirkung der ersten Druckfeder 28 in seine in der
Für den Fall, dass das Entlüftungsventil vorhanden ist, arbeitet dieses antizyklisch zum Hand-betätigten Ventil, sodass das Entlüftungsventil geschlossen wird, wenn der Hebel 23 in Richtung des Gehäuses 8 gedrückt wird, um das Hand-betätigte Ventil zu öffnen, und geöffnet wird, um einen schnellen Druckabbau im Arbeitsraum 7 bzw. in der Einheit 20 (falls die Entlüftungsöffnung in dieser vorhanden ist) sicherzustellen, wenn der Hebel 23 in seine Ruhestellung der
Eine Abwandlung der ersten Ausführungsform der
Unter Bezugnahme auf die
In der zweiten Ausführungsform wird ein Schieberventil 40 eingesetzt, das in der Einheit 20 in einer entsprechenden Bohrung 43 senkrecht zur Gehäuseachse beweglich ist. Das Schieberventil 40 wird analog zum Ventil der ersten Ausführungsform durch die dritte Druckfeder 44 in seine Ruhestellung, wie in der
Unter Bezugnahme auf die
Unter Bezugnahme auf die
Unter Bezugnahme auf die
Unter Bezugnahme auf die
Ebenso wie in
Die
In der
In der
Die in den
Dieser vordere, lageunabhängige Verschluss des Arbeitsraumes hat insbesondere auch bei Einbaugeräten den Vorteil, das die Systeme unempfindlich werden gegen langsamen Druckaufbau beim erstmaligen Einschalten. Dies kommt relativ häufig vor, weil bei Einbaugeräten oft lange Installationsleitungen mit mehreren Geräten und/oder anderen Verbrauchern vorkommen. Bei einem solchen relativ langsamen Druckanstieg schließt der Prägestempelbolzen 3 nämlich nicht, wie bei einem schnellen Anstieg, sondern es entsteht sehr oft eine geräuschvolle Schwingung (Vibration des Prägestempelbolzens 3 direkt vor der Auslassöffnung) ganz ähnlich wie bei einem Blasinstrument mit Rohrblatt.This front, position-independent closure of the working space has the advantage, in particular with built-in appliances, that the systems become insensitive to slow pressure build-up when first switched on. This is relatively common because built-in devices often have long installation lines with multiple devices and / or other consumers. In fact, with such a relatively slow increase in pressure, the
In der Ausführungsform von
In der Ausführungsform von
Als Alternative zu den Ausführungsformen von
Ein Ausführungsbeispiel für eine derart verzögerte Ventilöffnung ist in der
Um eine schnellere Wiederherstellung des sicheren Zustandes der Prägevorrichtung zu bewirken, kann man im Kopfbereich eine oder mehrere (sehr kleine) Bohrungen anbringen. Hierdurch kann während des Rückhubs des Schlagbolzens 4 Luft eintreten, und die Rückstell-Geschwindigkeit wird weniger stark durch die Strömungsgeschwindigkeit im Spalt 2 limitiert. Nachteilig ist hierbei allerdings, dass die Bremswirkung des Luftpolsters im Expansionsraum 6 gegen einen ungewollten Schlag bei Betätigung des Handventils zum Druckaufbau ebenfalls stark reduziert wird.To effect a faster recovery of the secure state of the embossing device, one can attach one or more (very small) holes in the head area. As a result, 4 air can enter during the return stroke of the firing pin, and the reset speed is less strongly limited by the flow velocity in the
Daher ist es zweckmäßig, derartige Luftdurchlässe im Kopfbereich des Gehäuses 8 als Rückschlag-Ventile 70 auszuführen, wie in der
Wenn in irgendeinem der Ansprüche erwähnte technische Merkmale mit einem Bezugszeichen versehen sind, wurden diese Bezugszeichen lediglich eingeschlossen, um die Verständlichkeit der Ansprüche zu erhöhen. Entsprechend haben diese Bezugszeichen keine einschränkende Auswirkung auf den Schutzumfang eines jeden Elements, das exemplarisch durch solche Bezugszeichen bezeichnet wird.When technical features mentioned in any of the claims are provided with a reference numeral, these reference numerals have been included only to enhance the intelligibility of the claims. Accordingly, these reference numbers have no limiting effect on the scope of protection of each element, which is exemplified by such reference numerals.
Claims (15)
- Unit (20) for connecting compressed air as a component of an embossing device with supply of compressed air, which has a tubular housing (8) to be gripped by hand in which a striking pin (4) to be impinged on by the compressed air is arranged displaceably in the longitudinal direction of the housing (8), the striking pin dividing the housing into a work chamber (7) and an expansion chamber (6), and a valve (5) for venting the expansion chamber, causing the strike, characterized in that the unit (20) has a manually operated valve (24, 25; 40) for alternately blocking and releasing the compressed air supply to the embossing device and a valve operation member (23) cooperating with the valve (24, 25; 40), comprising a hand contact part (23') arranged on externally on the housing (8), which hand contact part is biased resiliently into a resting position in which the valve (24, 25; 40) is closed, and which hand contact part is adapted to reach, during gripping of the embossing device by hand, an opening position in which the valve (24, 25; 40) is open.
- Unit (20) according to Claim 1, wherein the resting position is defined by a position of the hand contact part (23'), which is directed away from the housing (8), and the opening position is defined by a position of the hand contact part (23') which is directed towards the housing (8).
- Unit (20) according to Claim 1 or 2, wherein the valve operation member is a lever (23) having a longitudinal arm extending along the housing (8), which arm forms the hand contact part (23').
- Unit (20) according to Claim 3, wherein the arm (23') extends in the longitudinal direction of the housing (8) and is movable transversely to the housing (8).
- Unit (20) according to one or more of Claims 1 through 4, wherein the valve (24, 25) is formed by a pusher (24) and a sealing (25) and further comprises a first pressure spring (28) which presses the valve (24, 25) into its closed position, the pusher (24) in the closed position of the valve (24, 25) acting on the lever (23) in such a manner that the lever (23) assumes its resting position in a position spaced from the housing (8).
- Unit (20) according to one or more of Claims 1 through 4, wherein the valve (40) is formed by a sliding valve and further comprises a third pressure spring (44) which presses the valve (40) into its closed position, the valve (40) in its closed position acting on the lever (23) such that the lever (23) assumes its resting position in a position spaced from the housing (8).
- Unit (20) according to one or more of the preceding Claims, with a ventilating valve (32, 33) configured such that the work chamber (7) of the embossing device is connected with the exterior of the embossing device anti-cyclically to the function of the valve (24, 25, 40) when the valve operation member (23) is operated.
- Unit (20) according to Claim 7, wherein the ventilating valve (32, 33) is provided on the housing (8) of the embossing device, or
wherein the ventilating valve (32, 33) is provided inside the unit (20) and wherein preferably passages (47, 48) from the work chamber (7) to the unit (20) for connecting compressed air and further to the exterior of the embossing device are provided and the valve (24, 25, 40) is adapted to open and close the passages (47, 48) anti-cyclically for connecting compressed air. - Unit (20) according to Claim 7 or 8, wherein the ventilating valve (32, 33) comprises a venting seal (32) and a second pressure spring (33) which are arranged between the lever (23) and the housing (8) such that in the resting position of the lever (23), the ventilating valve (32, 33) is open and in the depressed position of the lever (23), the ventilating valve (32, 33) is closed.
- Unit (20) according to one or more of the preceding Claims, where the unit (20) is a separate component of the embossing device.
- Unit (20) according to Claim 10, where the unit (20) comprises sealing means (46) for air-tight sealing with the embossing device.
- Embossing device with compressed air drive which contains a unit (20) for connecting compressed air according to one or more of the preceding Claims.
- Embossing device according to Claim 12, which is embodied as a manual embossing device.
- Embossing device according to Claim 12 or 13, containing a helical spring (11'; 60) which drives the embossing die bolt (3) outward in the longitudinal direction of the housing (8), the helical spring preferably being formed by a retrun spring (11') for the striking pin (4).
- Embossing device according to one or more of Claims 12 through 14, the housing (8) having, in an anterior region, at least one narrow bore or at least one check valve (70) connecting the expansion chamber (6) with the exterior of the embossing device, wherein preferably the housing (8) has at least one opening (50; 50') at the height of the position of the rear basic position of the striking pin (4), which opening connects the work chamber (7) with the exterior of the embossing device.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200420016288 DE202004016288U1 (en) | 2004-10-20 | 2004-10-20 | Unit for supplying compressed air to a hand-held stamping device comprises a lever interrupting the flow of compressed air in its rest position, and a valve actuated by the lever and closed when the lever is in the rest position |
DE102004057200A DE102004057200B4 (en) | 2004-10-20 | 2004-11-26 | Embossing device with compressed air drive and unit for the connection of compressed air therefor |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1650050A2 EP1650050A2 (en) | 2006-04-26 |
EP1650050A3 EP1650050A3 (en) | 2008-03-19 |
EP1650050B1 true EP1650050B1 (en) | 2012-09-12 |
Family
ID=35483540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20050108868 Active EP1650050B1 (en) | 2004-10-20 | 2005-09-26 | Assembly for supplying compressed air to an embossing device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1650050B1 (en) |
DE (1) | DE102004057200B4 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2457930A (en) * | 1944-07-17 | 1949-01-04 | Cons Vultee Aircraft Corp | Fluid pressure operated device for inserting cushion pads |
DE3247577C2 (en) * | 1982-12-22 | 1987-03-05 | Helmut 8012 Ottobrunn Schreiner | Pneumatic marking unit |
CH655837A5 (en) * | 1983-04-11 | 1986-05-30 | Christian Cambuzat | METHOD AND DEVICE FOR MARKING AN OBJECT. |
DE3739539C2 (en) * | 1987-11-21 | 2000-03-09 | Borries Markier Systeme Gmbh | Embossing device for embossing characters on an object surface |
DE8909282U1 (en) * | 1989-08-01 | 1989-09-14 | J. Lorch Gesellschaft & Co Kg, 7035 Waldenbuch | Pneumatically operated device for plastic deformation, in particular for impact stamping |
-
2004
- 2004-11-26 DE DE102004057200A patent/DE102004057200B4/en not_active Expired - Fee Related
-
2005
- 2005-09-26 EP EP20050108868 patent/EP1650050B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1650050A3 (en) | 2008-03-19 |
DE102004057200A1 (en) | 2006-04-27 |
DE102004057200B4 (en) | 2006-08-10 |
EP1650050A2 (en) | 2006-04-26 |
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