EP2656983B1 - Paper stack cutting machine with one or two-handed operation - Google Patents

Description

The invention relates to a paper stack cutting machine with a one- or two-hand operation for electrically triggering a cutting and / or pressing operation, wherein the one-handed operation has an operating unit with a manual switching element or the two-handed operation two actuating units, each with a manual switching element.

• Getrennte Betätigung der Pressung, danach Betätigung des Schneidmessers. Diese Funktion wird eingesetzt, wenn sich der Bediener nach Pressen des Papierstapels noch einmal davon überzeugen will, dass der Schnitt an der gewünschten Stelle ausgeführt wird.
• Lösen der Pressung, wenn der Schneidvorgang nicht ausgeführt werden soll. Dies ist der Fall, wenn bei oben genannter Variante nach dem Pressen bemerkt wird, dass der Schnitt an der falschen Stelle erfolgen würde.
• Gleichzeitige Betätigung von Pressung und Schneidwerk. Diese Funktion wird gewählt, wenn sich der Bediener sicher ist, dass der Schnitt an der richtigen Stelle erfolgen wird.

To rule out injuries to the operator of a paper-stack cutting machine, there are legal requirements. One way to comply with these regulations is to attach a two-hand control. It ensures that the hands of the operator are at the dangerous time of cutting at the switches of the two-hand control and not near the knife. The following functions can be controlled via two-hand operation:

• Separate actuation of the pressing, then operation of the cutting blade. This function is used when the operator wants to make sure that the cut is made at the desired location after pressing the paper stack.
• Releasing the pressure if the cutting process is not to be carried out. This is the case when it is noted in the above variant after pressing that the cut would be done in the wrong place.
• Simultaneous operation of pressing and cutting unit. This function is selected when the operator is sure that the cut will be made in the right place.

In a known paper-stack cutting machine with two-hand operation, the two-hand operation consists of two electrical switch masks each on the right and left side of the machine front. The right switch mask has a first pushbutton with the function "pressing" and a second pushbutton with the function "cutting". The left switch mask also has via two pushbuttons. Here, the first push-button has the function of confirming the function selected via the right-hand switch mask. This means that if the function "pressing" or "cutting" is selected via the right switch mask, the machine will only work if the confirmation button is pressed simultaneously on the left switch mask. The second pushbutton of the left switch mask causes the pressure to return to the starting position if the cutting process is not to be triggered.

• Unergonomisches Arbeiten, da die Drucktaster nur mit der Fingerkuppe von vorne gedrückt werden können, was eine unnatürliche Handhaltung bedingt.
• Wenn zuerst gepresst und danach geschnitten werden soll, ist ein Umgreifen notwendig.
• Gleiches Design der Drucktaster mit unterschiedlicher Funktion. Das heißt, der Bediener kann die unterschiedliche Funktion der Drucktaster nicht ertasten. Der ungeübte Bediener ist gezwungen, auf die Piktogramme an den Drucktastern zu schauen.

However, this push-button operation has the following disadvantages:

• Unergonomic work, since the pushbuttons can only be pressed with the fingertip from the front, which requires an unnatural hand position.
• When first pressed and then cut, it is necessary to grip around.
• Same design of pushbuttons with different function. That is, the operator can not feel the different function of the pushbuttons. The inexperienced operator is forced to look at the pictographs on the push buttons.

From the US 2,916,801 A For example, a paper cutting machine with two push button switches is known, which are provided on two opposite sides of a control panel to actuate the motor for lowering the cutting blade. A two-position switch is also provided on the control panel to toggle the switch between manual operation via the two push-button switches and program-controlled operation.

Furthermore, from the DE 11 28 836 B Still another paper cutting machine is known, which has a hand lever and a control knob for actuating a knife and a foot pedal for actuating a clamping bar. In addition, a two-way switch is provided to switch between manual control and automatic control.

In contrast, it is the object of the present invention to make the one- or two-hand operation simpler in a paper-stack cutting machine.

This object is achieved in that the one or both actuators are each formed in two stages, wherein the two switching stages in the same direction of actuation are consecutive, that the manual switching element in the first switching stage, a first switch and in the second switching stage, a second Switch switches, and that the machine is controlled so that when pressing the one or two actuator units to the first switching stage, the pressure is activated and by further pressing the one or two actuator units to the second switching stage, the cutting process is triggered.

The inventive 2-stage actuator units are mounted instead of the previous switch masks on the machine front. The 2-stage operating unit has, as the name implies, over 2 switching stages, which fulfill various functions. The operating unit is pressed down by the operator. Halfway through, the operator learns through a mechanical resistance feedback that the first shift stage has been reached. From now on, the operator force is higher up to the limit stop and tells the operator that the second switching stage is now switched. By pressing the operating unit until the first switching stage (in the case of two-hand operation, both actuating units must be actuated at the same time), the pressing is activated. By further pressing the operating unit to the second switching stage (here both actuators must be operated simultaneously in a two-handed operation), the cutting process is triggered. The cutting process with automatic pressing can also be started immediately by the hand switching element or both manual switching elements are pressed right through. If the pressure is to be released without cutting, only one of the two actuating units needs to be pressed briefly.

In a particularly preferred embodiment, the actuation direction of the one or the two manual switching elements corresponds in each case to the vertical direction of the cutting and / or pressing process.

• Die Betätigungsweise der 2-stufigen Betätigungseinheit in der Papierstapelschneidemaschine fördert die intuitive Bedienbarkeit der Maschine. Es erscheint dem Bediener sofort als logisch, dass die erste Schaltstufe des Handschaltelements die Pressung, also quasi die Vorbereitung auf den Schneidvorgang, auslöst. Das Weiterdrücken des Handschaltelements in die zweite Schaltstufe schließt mit dem Schneidevorgang ab. Die übrigen Funktionen erschließen sich dem Bediener nach kurzer Testphase. Selbst ohne erklärende Piktogramme ist die richtige Bedienung der Papierstapelschneidemaschine kein Problem.
• Die Bedienungsrichtung der 2-stufigen Betätigungseinheit entspricht der dadurch ausgelösten Verfahrrichtung der Pressung und des Schneidmessers. Wird das Handschaltelement nach unten gedrückt, bewegen sich dadurch Pressung und Schneidmesser auch nach unten. Diese Tatsache fördert ebenfalls die intuitive Bedienbarkeit.
• Beim Bedienen der Papierstapelschneidemaschine mit einer bzw. zwei 2-stufigen Betätigungseinheiten ist kein Umgreifen notwendig. Soll zuerst die Pressung aktiviert werden, um zu kontrollieren, dass der Schnitt an der richtigen Stelle erfolgt, und erst dann geschnitten werden, verbleiben die Hände des Bedieners in derselben Position.
• Die eine bzw. die beiden 2-stufigen Betätigungseinheiten werden leichter gefunden als die Drucktaster der bekannten Papierstapelschneidemaschine, bei der vor Betätigung erst nachgeschaut werden muss, welcher Knopf gedrückt werden muss.
• Die eine bzw. die beiden 2-stufigen Betätigungseinheiten ermöglichen ein ergonomisches Arbeiten. Im Gegensatz zu den bisherigen Drucktastern, die immer mit der Fingerkuppe von vorne gedrückt werden müssen, können die Handschaltelemente auf verschiedene Art und Weise betätigt werden.
• Die unterschiedlichen Betätigungskräfte für die erste und zweite Schaltstufe geben dem Bediener eine taktile Rückmeldung über den jeweiligen Schaltzustand.

Compared with the well-known known push-button arrangement, the one- or two-hand operation according to the invention has the following advantages:

• The operation of the 2-stage operating unit in the paper stack cutting machine promotes the intuitive operation of the machine. It immediately appears logical to the operator that the first switching stage of the manual switching element triggers the pressing, that is to say the preparation for the cutting process. The further pressing of the manual switching element in the second switching stage concludes with the cutting process. The remaining functions are available to the operator after a short test phase. Even without explanatory pictograms, the correct operation of the paper-stack cutting machine is no problem.
• The operating direction of the 2-stage operating unit corresponds to the traversing direction of the pressing and the cutting blade triggered thereby. If the manual switching element is pressed down, pressing and cutting blades also move downwards. This fact also promotes intuitive usability.
• When operating the paper stack cutting machine with one or two 2-stage operating units no encompassing is necessary. If the pressure is first to be activated to control that the cut is made in the right place, and only then cut, the operator's hands remain in the same position.
• The one or the two-stage operating units are easier to find than the push-button of the known paper-stack cutting machine, which must first be looked up before actuation, which button must be pressed.
• The one or both 2-stage operating units allow ergonomic work. In contrast to the previous push buttons, which must always be pressed with the fingertip from the front, the manual switching elements can be operated in different ways.
• The different actuating forces for the first and second switching stage give the operator a tactile feedback about the respective switching state.

Further advantages of the invention will become apparent from the description and the drawings. Likewise, according to the invention, the above-mentioned features and those which are still further developed can each be used individually for themselves or for a plurality of combinations of any kind. The embodiments shown and described are not to be understood as exhaustive enumeration, but rather have exemplary character for the description of the invention.

Fig. 1

eine erfindungsgemäße Papierstapelschneidemaschine mit Zweihandbedienung zum elektrischen Verfahren eines Schneidmessers und eines Pressbalkens;

Fign. 2, 3

eine 2-stufige Betätigungseinheit der in Fig. 1 gezeigten Zweihandbedienung sowohl in einer perspektivischen Frontansicht der Maschine (Fig. 2) als auch in einer perspektivischen Ansicht aus dem Maschineninneren (Fig. 3);

Fig. 4

eine Explosionsdarstellung der 2-stufigen Betätigungseinheit; und

Fign. 5, 6

eine perspektivische Ansicht der 2-stufigen Betätigungseinheit mit vergrößerter Detailansicht der Drehschenkelfeder für die erste Schaltstufe (Fig. 5) und der Drehschenkelfeder für die zweite Schaltstufe (Fig. 6).

The invention is illustrated in the drawings and will be explained in more detail with reference to an embodiment. It shows:

Fig. 1

a paper stack cutting machine according to the invention with two-handed operation for electrically operating a cutting blade and a press bar;

FIGS. 2, 3

a 2-stage operating unit of the Fig. 1 shown two-hand operation both in a front perspective view of the machine ( Fig. 2 ) as well as in a perspective view of the machine interior ( Fig. 3 );

Fig. 4

an exploded view of the 2-stage actuator unit; and

FIGS. 5, 6

a perspective view of the 2-stage actuator unit with an enlarged detail view of the torsion spring for the first switching stage ( Fig. 5 ) and the torsion spring for the second switching stage ( Fig. 6 ).

In the Fig. 1 The paper stack cutting machine 1 shown comprises a cutting table 2 as a support for a paper stack 3 to be cut, a cutting blade carrier 4, which carries the cutting blade 5 diagonally downwards by means of a motor (not shown), and a pressing beam 6 which can be moved vertically by means of a motor (not shown) for depressing the paper stack 3 to be cut, as well as a two-hand operation 10 for electrical operation of the cutting blade carrier 4 and the press bar 6. The two-hand operation 10 has left and right on the machine front each have a 2-stage operating unit 11 with a switchable manual switching element 12 .

As in FIGS. 2 and 3 shown, the manual switching element 12 is bow-shaped with a button 13 and two side brackets 14a , 14b formed, which protrude through two narrow slots 15 in the machine front 16 . The actual mechanism of the actuating unit 11 is hidden inside the machine and will be described below with reference to the in Fig. 4 shown exploded view.

The two brackets 14a, 14b project through the machine front 16 and through a slot cover 17 located behind the machine front 16, which seals the machine interior dust-tight to the outside. The two brackets 14a, 14b are rotatably mounted on a base body 18 via two journals 19 and additionally have the task of switching two electrical switches 20a , 20b , which are provided on a control board 21 fastened to the base body 18. A spacer plate 22 arranged between the base body 18 and the machine front 16 gives the slot cover 17 sufficient freedom to move up and down with the brackets 14a, 14b. On the two stub axles 19 each have a torsion spring 23a , 23b stored against the restoring force, the manual switching element 12 from its in FIGS. 2 and 3 shown basic position is deflectable. Instead of the two journal 19 may also be provided a continuous axis. The basic position and a lower end position of the manual switching element 12 are defined by end stops 24 including damper 25 , which are fixed to the base body 18 and cooperate only with the bracket 14b. The end stops 24 absorb the actual force, which is exerted in the normal position by the spring force and actuation by the operator. The dampers 25 prevent the bracket 14b from striking the end stops 24 directly. This reduces the noise and gives a pleasant feeling of operation.

As in Fig. 5 shown, the first torsion spring 23a is supported with one leg on the base body 18 and with the other leg to the inwardly bent strap end 26a of the bracket 14a, so as to return the manual switching element 12 in its entire rotational range in his in Fig. 5 reset shown basic position. The first torsion spring 23a is thus always in engagement with the bracket 14a and pushes the manual switching element 12 always back to the normal position. The arrow 27 shows the direction of movement of the bracket 14 a, when the manual switching element 12 is actuated in the direction of its end position.

As in Fig. 6 shown, the second torsion spring 23b supported in the basic position shown of the manual switching element 12 with one leg on the base body 18 and lies with the other leg under bias on an inwardly curved support tab 28 of the body 18, so not on the bent inwardly bracket end 26b of the bracket 14b. In the basic position, the second torsion spring 23b is therefore not yet engaged with the bracket 14b and therefore not effective. Only when the manual switching element 12 is deflected from its basic position about halfway towards the end position, the swung in the direction of arrow 27 strap end 26b takes the overlying leg of the second pivot leg 23b and thereby lifts him from the support tab 28. Now also the second torsion spring 23b is engaged with the bracket 14b.

The rotation angle range or the path on which the bracket 14b is not yet in engagement with the second torsion spring 23b, forms the first switching stage of the 2-stage operating unit 11. The rotation angle range or the path on which the bracket 14b then engaged the second torsion spring 23b is, forms the second switching stage of the 2-stage actuator unit 11. The abutment of the bracket 14b on the second pivot member 23b is perceived by the operator as a kind of detent. At this point, the second torsion spring 23b is now effective, and the restoring force is increased abruptly due to the bias of the second pivot leg spring 23b. When releasing the manual switching element 12, the second torsion spring 23b is halfway again on the support tab 28 and from here is no longer engaged with the bracket 14b. This point is again perceived by the operator as a kind of detent. The different restoring forces and thus the different operating forces of the operator for the first and second switching stage give the operator a tactile feedback on the respective switching stage. The two switching stages are in the operating direction of the manual switching element 12 in a row, wherein the operating direction of the manual switching element 12 corresponds to the direction of travel of the cutting blade 5 down.

The lower electrical switch 20a is connected to query the basic position as NC, while the upper electrical switch 20b is designed to query the end position as NO. This means that as soon as the manual switching element 12 is deflected from its basic position, the lower electrical switch 20a switches. The upper electrical switch 20b does not switch until reaching the end position of the manual switching element 12.

The operation of the paper stack cutting machine 1 functions as follows: By simultaneously depressing the buttons 13 of the two operating units 11, the first switching stage is activated, thereby lowering the pressing bar 6 to depress the paper stack 3 to be cut. By simultaneously pressing the two buttons 13 to the end position, the second switching stage is switched and thereby the cutting blade carrier 4 is lowered to cut the depressed stack of paper 3. The cutting process with automatic pressing can also be started immediately by pressing both buttons 13 without stopping until their final position. If the pressure is to be released without cutting, only one of the two actuating units 11 needs to be pressed briefly.

On the main body 18 all parts of the 2-stage actuator unit 11 are attached. This construction with the main body 18 offers the advantage that the 2-stage actuating unit 11 can be completely pre-assembled. For mounting on the machine, only the button 13 must be removed. Then the two brackets 14a, 14b can be inserted from behind through the slots 15 of the machine front 16. Finally, the button 13 is mounted again. This also has the advantage later in service that the complete operating unit 11 can be easily disassembled. The control board 21 is equipped with a plug connection to facilitate assembly and disassembly.

If a machine does not receive a separate press release, the first switching stage is eliminated by omitting the second torsion spring 23b and the lower one or upper electrical switch 20a, 20b. This is the case with machines in which the pressing takes place or is activated in another way, for example by manual pressing or press release by foot switch. Thus, by installing or removing the second rotary leg spring 23b and one of the two electrical switches 20a, 20b, a 2-stage or 1-stage operating unit can be realized in the simplest manner.

Instead of the described two-hand operation, only one-handed operation can be provided for the electrical triggering of the cutting and / or pressing process, which has a single actuating unit 11 with a manual switching element 12 whose actuating direction corresponds to the vertical direction of the cutting and / or pressing process. In such one-handed operation, it should then be otherwise, e.g. Ensure that the other hand of the operator is not near the knife at the dangerous time of cutting, using suitable mechanical guards.

Claims (11)

1. Paper stack cutting machine (1) with a one-hand or two-hand operation (10) for electrically triggering a cutting and/or pressing process, wherein the one-hand operation comprises an actuation unit (11) with a manually operated switching element (12) or the two-hand operation (10) comprises two actuation units (11) each having one manually operated switching element (12),
   characterized in that
   one or both actuation units (11) are each formed with two stages, wherein the two switching stages are located one behind the other in the same direction of actuation,
   that the manually operated switching element (12) switches in the first switching stage a first electric switch (20a) and in the second switching stage a second electric switch (20b), and
   that the machine (1) is controlled in such a manner that upon pushing one or both actuation units (11) to the first switching stage, compression is activated and the cutting operation is triggered by further pushing one or both actuation units (11) to the second switching stage.
2. Paper stack cutting machine according to claim 1, characterized in that one or both manually operated switching elements (12) are rotatably mounted.
3. Paper stack cutting machine according to any one of the preceding claims, characterized in that one or both manually operated switching elements (12) can each be moved to the two switching stages against the action of a restoring force.
4. Paper stack cutting machine according to claim 3, characterized in that the restoring force in the second switching stage abruptly increases compared to the restoring force in the first switching stage.
5. Paper stack cutting machine according to claim 3 or 4, characterized in that the restoring force is formed by a first spring (23a) which is effective in both switching stages, and by a second spring (23b) which is, in particular, pretensioned and is effective only in the second switching stage.
6. Paper stack cutting machine according to claim 5, characterized in that one or both manually operated switching elements (12) are rotatably mounted and the two springs are formed by rotary leg springs (23a, 23b), wherein the first rotary leg spring (23a) is supported on the manually operated switching element (12) on the overall rotary area of the manually operated switching element (12), and wherein the second rotary leg spring (23b) is not supported on the manually operated switching element (12) on the rotary area of the first switching stage and is carried along by the manually operated switching element (12) only on the rotary area of the second switching stage.
7. Paper stack cutting machine according to claim 5 or 6, characterized in that one or both 2-stage actuation units (11) can be converted into a 1-stage actuation unit in each case by removing the second spring (23b) and one of the two electric switches (20a, 20b).
8. Paper stack cutting machine according to any one of the preceding claims, characterized in that the first electric switch (20a) is connected for scanning a basic position of the manually operated element (12) and the second electric switch (20b) is connected for scanning an actuated final position of the manually operated switching element (12).
9. Paper stack cutting machine according to claim 8, characterized in that the first electric switch (20a) for scanning the basic position of the manually operated switching element (12) is designed as an opening contact and the second electric switch (20b) for scanning the final position of the manually operated switching element (12) is designed as a closing contact.
10. Paper stack cutting machine according to any one of the preceding claims, characterized in that one or both actuation units (11) are separate mounting units in each case.
11. Paper stack cutting machine according to any one of the preceding claims, characterized in that the actuation direction of one or both manually operated switching elements (12) corresponds in each case to the vertical direction of the cutting and/or pressing operation.

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