Device for cutting and pressing

Abstract

The invention relates to a device (1) for cutting and pressing operations, comprising a housing (2), a piston (3) which is arranged within the housing (2) for movement along a longitudinal axis (D), a tool (4) which is fastened to a first end (5) of the piston (3), a drive unit (10), a threaded pin (11) which is arranged coaxially to the longitudinal axis (D) and extends with a first longitudinal section (11.1) within the piston (3), wherein the threaded pin (11) is fastened to the drive unit (10) in the region of a second longitudinal section (11.2) for rotation about the longitudinal axis (D), a return unit (21) which is fastened to the housing (2) and the piston (3), a support unit (14) which has a recess (15) with an internal thread (20) formed therein in sections and which is movable along the longitudinal axis (D) and is rotationally inhibited relative to the housing (2),wherein the support unit (14) is designed with its end facing away from the drive unit as a support for a second end (6) of the piston (3), a first operating position (A) in which the internal thread (20) is in threaded engagement with the threaded pin (11), a second operating position (B) in which the support unit (14) is displaced orthogonally to the longitudinal axis (D) and the internal thread (20) and the threaded pin (11) are out of threaded engagement with one another and the support unit (14) releases the threaded pin (11), wherein in the second operating position (B) the return unit (20) is designed to return the piston (3) and the support unit (14) to a starting position after a movement along the longitudinal axis (D) in the first operating position (A).

Description

[0001] The subject matter of the invention relates to a device for carrying out a cutting and / or pressing process.

[0002] Devices for performing a pressing process to create a press connection between parts are known. This can involve, for example, a sleeve and an electrical conductor being pressed together. The part to be pressed can also be, for example, a cable lug. Furthermore, devices are known in which so-called fittings are pressed together to connect two pipe sections.

[0003] Depending on the tool used, the device can also be used to carry out a cutting operation or to carry out a pressing and cutting operation.

[0004] To apply the necessary force to or into the tool, the device is known to have a drive unit with an electric motor. The electric motor drives a threaded pin, the rotation of which results in a longitudinal displacement of a piston, which exerts a force on a part of the tool. This allows the desired work process to be performed.

[0005] The tool comprises a tool part connected to the piston and a fixed jaw. To perform a pressing process, the parts to be pressed are positioned between the tool part and the fixed jaw. By activating the drive, the piston applies the necessary force to the tool part to complete the work process.

[0006] Such devices are used primarily as mobile hand tools. These pose a certain risk of injury to the operator, which can be increased, particularly through incorrect operation or improper handling.

[0007] The invention is based on the object of providing a device for carrying out a cutting and / or pressing process with improved work safety.

[0008] This object is achieved according to the invention by a device having the features of claim 1. Advantageous further developments and embodiments of the device according to the invention are the subject of the dependent claims.

[0009] With the device according to the invention, a device was developed that contributes to improved occupational safety and ease of use. To date, no adequate solution has been known in the prior art that offers the described functions.

[0010] The invention relates to a device for cutting and / or pressing processes, comprising a housing and a piston which is arranged within the housing so as to be movable along a longitudinal axis. A tool is fastened to a first end of the piston. The tool is a modular unit which can be inserted into the device, such as cutting tools and / or pressing dies. The device for cutting and pressing processes further comprises a drive unit and a threaded pin. The threaded pin is arranged coaxially to the longitudinal axis and extends with a first longitudinal section within the piston. In the region of a second longitudinal section, the threaded pin is connected to the drive unit and is mounted so as to be rotatable about the longitudinal axis. In addition, the device for cutting and pressing processes comprises a support unit and a return unit which are fastened to the housing and the piston.The support unit has a recess with an internal thread formed in sections. It is movable along the longitudinal axis and rotationally locked relative to the housing. With an end facing away from the drive unit, the support unit supports one end of the piston.

[0011] The recess can, for example, be a bore or a milled recess extending in the direction of the longitudinal axis and parallel to it through the support unit. The internal thread preferably extends over the entire axial length of the recess. On the inner circumference of the recess, the thread can be formed only in sections in the circumferential direction.

[0012] In a first operating position of the device for cutting and / or pressing processes, the internal thread of the recess is in threaded engagement with the threaded pin. The first operating position represents the normal state of the device in which the cutting or pressing process is carried out. In the first operating position, the rotary movement of the threaded pin is converted into a translatory movement of the support unit and the piston interacting with the support unit. Depending on the direction of rotation of the threaded pin, the support unit can be moved back and forth along the longitudinal axis D in this first operating position.

[0013] In a second operating position B, the support unit is displaced orthogonally to the longitudinal axis, and the internal thread and the threaded pin are positioned without thread engagement, so that the support unit releases the threaded pin. The return unit is designed to return the piston and the support unit to an initial position after a movement along the longitudinal axis in or during the first operating position. Thus, in the second operating position, the support unit no longer performs a propulsion function and is therefore no longer held in its position along the longitudinal axis by the threaded pin.

[0014] A force acting on the piston, which is generated by the rotating threaded pin and the rotation-locked support unit advancing along the threaded pin, can be instantly relieved by transferring it to the second operating position in conjunction with the return unit. Consequently, the second operating position represents an emergency stop function. This is independent of whether the drive unit is still active or not.

[0015] When the device remains in the first operating position, the pressure on the piston and thus on the corresponding tool is continuously increased by the support unit advancing towards the end facing away from the drive unit when the drive unit is in operation. A final pressure and the associated cessation of the pressure build-up can be achieved when a stop position is reached, for example when the two pressing dies or cutting tools touch. This can be sensed both via a correspondingly applied pressure and via the extent to which the support unit or the piston is moved within the housing. Once the stop position is reached, the drive unit switches to counter-rotation of the threaded pin so that the support unit and the piston are moved back to their starting position. The spindle-shaped guidance of the support unit on the threaded pin makes it possible to apply the corresponding pressure or displacement in both directions of movement of the support unit.This is particularly advantageous in cutting processes where jamming or wedging of the cutting tools in or on the workpiece is possible.

[0016] Apart from the drive unit, the device comprises only mechanical components. This offers the advantage of increased serviceability. The simple, purely mechanical design of the device thus increases its service life compared to prior art devices.

[0017] According to an advantageous embodiment, the internal thread of the support unit is formed over up to 180° in the recess. In order to enable lateral displacement of the support unit orthogonal to the longitudinal axis and thus also orthogonal to the threaded pin, it is necessary that the internal thread of the recess extends over no more than 180° of the inner circumference of the recess. With an internal thread that is formed over more than 180° in the recess, displacement of the support unit and the associated loosening of the threaded engagement between the internal thread and the thread of the threaded pin due to jamming of the support unit on the threaded pin would no longer be possible. In principle, however, internal threads with less than 180° are also possible.

[0018] According to a further advantageous embodiment, the support unit can be displaced into the first and second operating positions by means of a friction element and / or a shaped element. The friction and / or shaped element is designed to displace the support unit orthogonally to the longitudinal axis both into the first operating position and into the second operating position and also to hold it in the respective operating position. The friction element can, for example, be an eccentric disc which, due to its asymmetric shape and a corresponding friction bearing in the support unit, enables the support unit to be displaced. Alternatively, other structures of the friction element are also conceivable. The shaped element can, for example, be a gear structure which meshes with a toothing on the support unit. Other suitable alternatives are also conceivable for the shaped element.

[0019] According to a further advantageous embodiment, the friction and / or forming element is fastened in a rotationally fixed manner to a shaft that is rotatably mounted on the housing. Consequently, the friction and / or forming element is stationary. In other words, when the operating positions are changed, the support unit is displaced, whereas the friction and / or forming element is stationary and mounted rotatably about a shaft. To keep the device as compact as possible, the shaft is fastened to the housing parallel to the longitudinal axis or to the threaded pin. To bring the device into the first or second operating position, a lever is attached to the shaft, by actuating which the shaft can be manually moved into the corresponding position. As an alternative to the lever, a preloaded push or rotary knob is also conceivable, which triggers the second operating position when actuated.

[0020] According to a further advantageous embodiment, the support unit comprises a first and a second support element, wherein the first and second support elements are arranged one behind the other in the direction of the longitudinal axis in the region of the first longitudinal section of the threaded pin and are displaceable orthogonally to the longitudinal axis.

[0021] According to a further advantageous embodiment, the internal threads of the first and second support elements arranged one behind the other are each arranged on mutually opposite sections of the inner circumference of the respective recesses, wherein the first and second support elements are displaceable orthogonally to the longitudinal axis and opposite to each other into the first and second operating positions.

[0022] In order to best fulfil its function as a bearing in the first operating position, it is advantageous if the support unit is supported on the threaded pin by an internal thread over 360°. Since lateral displacement of the support unit is only possible if the internal thread extends 180° of the recess, it is proposed to design the support unit from two support elements that can be displaced in opposite directions. This allows the support unit to support the threaded pin over the entire circumference of the threaded pin in the first operating position. In order to release both support elements and move the device into the second operating position, the two support elements are pushed apart or away from each other by the friction and / or forming element. The displacement of the two support elements takes place anti-parallel, i.e. in opposite directions to each other.

[0023] According to a further advantageous embodiment, the return unit is designed as a tension and / or compression spring. One end of the return unit rests against the second end of the piston facing away from the drive unit, while the other end of the return unit rests against the opposite end of the housing in the region of the first end of the pin. Alternatively, the return unit can also be designed as a tension spring. For this purpose, the corresponding tension spring is attached at one end to the piston and at the other end to the end of the housing facing the drive unit. A combination of the two systems is also possible.

[0024] If the device for cutting and pressing processes is now used for a cutting or pressing process, the threaded pin is rotated by the drive unit. The support unit, which is in threaded engagement with the threaded pin in the first operating position, is thereby moved along the longitudinal axis in the direction of the end of the housing facing away from the drive unit. The piston sitting on the support unit is thus pushed out of the device by the support unit. In the process, the return unit is tensioned by a tension spring if a return element is provided, or compressed if provided by a compression spring. When changing from the first to the second operating position, the tension or compression spring relaxes. This results in the piston and the support unit being returned to their starting position, i.e. before the device is used.

[0025] According to a further advantageous embodiment, the threaded pin is rotatably mounted in the housing in the region of the second longitudinal section by means of an additional rolling bearing. The rolling bearing is designed to serve as an additional bearing for the threaded pin, in addition to the bearing in the drive. In particular, the rolling bearing is designed to absorb transverse forces generated by the support unit in the first operating position. The rolling bearing therefore ensures smoother running of the threaded pin, relieves the load on the bearing in the drive unit, and thus increases the service life of the device. In principle, the rolling bearing can be a fixed or loose bearing, whereby the corresponding type of rolling bearing must be selected depending on this.

[0026] According to a further advantageous embodiment, the housing is made up of several parts. A multi-part housing offers the advantage of simplified maintenance of the device. If a component present in the device and the housing needs to be replaced, it is not necessary to disassemble the entire device. After diagnosing the damaged component, only the section of the housing that lies within the area of the component to be replaced needs to be disassembled.

[0027] According to a further advantageous embodiment, the drive unit comprises a planetary gear and a motor that is at least indirectly operatively connected to the planetary gear. The motor can be an electric motor, although other motors and drives are also conceivable. Particularly when the drive is implemented by an electric motor, the energy can advantageously be provided by a battery and / or via a mains connection.

[0028] The planetary gear is designed to transmit high torque to the threaded pin at low speeds. Thus, the planetary gear serves as a reduction gear.

[0029] The invention and the technical environment are explained in more detail with reference to the figures. The figures show a particularly preferred embodiment, to which the invention is not limited, however. They show: Fig. 1: schematically shows a sectional view of the device for cutting and pressing operations along a longitudinal axis; Fig. 2a: schematically shows a cross-section of the device for cutting and pressing operations in a first operating position in a side view from the left; Fig. 2b: schematically shows a cross-section of the device for cutting and pressing operations in a first operating position in a side view from the right; Fig. 3a: schematically shows a further cross-section of the device for cutting and pressing operations in a second operating position in a side view from the left; Fig. 3b: schematically shows a further cross-section of the device for cutting and pressing operations in a second operating position in a side view from the right. Fig. 4: schematically shows in perspective the device according to Fig. 1

[0030] Unless explicitly referred to a specific figure, the following statements apply to all figures.

[0031] Fig. 1 shows schematically a sectional view of the device 1 according to the invention for cutting and / or pressing operations along a longitudinal axis D. The device 1 comprises a housing 2, which is partially in the Fig. 1 is shown. The housing 2 can be constructed in several parts. A piston 3 is arranged within the housing 2. The piston 3 is movable back and forth along the longitudinal axis D. The piston 3 has a first end 5 and a second end 6. The first end 5 is designed to cooperate with a tool 4, which is shown schematically. The tool 4 is designed as a cutting tool and / or pressing tool.

[0032] The device 1 has a threaded pin 11. The threaded pin 11 is arranged coaxially to the longitudinal axis D. A first longitudinal section 11.1 of the threaded pin 11 extends partially into the piston 3. For this purpose, the piston 3 has a correspondingly designed bore 3.1, which is coaxial with the threaded pin 11. The first longitudinal section 11.1 has an external thread 12. The threaded pin 11 is fastened in the region of a second longitudinal section 11.2 to a drive unit 10 so that it can rotate about the longitudinal axis D. In the transition region between the first longitudinal section 11.1 and the second longitudinal section 11.2, a circumferential, radially outward-directed stop 13 is provided.

[0033] The drive unit 10 preferably comprises a planetary gear 30 and an electrically operated motor 31 operatively connected to the planetary gear 30. The planetary gear 30 and the motor 31 are only indicated schematically here. The threaded pin 11 is rotatably mounted in the housing 2 in the region of the second longitudinal section 11.2 by a bearing 24, which preferably comprises two bearings, in particular roller bearings 24.1, 24.2, and is supported on the stop 13. The bearing 24 improves the concentricity of the threaded pin 11 and also increases its resistance to transverse forces.

[0034] The device 1 comprises a support unit 14, which is arranged so as to be movable along the longitudinal axis D and rotationally inhibited relative to the housing 2. In the preferred embodiment, the support unit 14 is arranged between the stop 13 and the second end 6 of the piston 3. The piston 3 rests with its second end 6 on the support unit 14.

[0035] The support unit 14 has a recess 15 with an internal thread 20 formed therein in sections. The support unit 14 is, on the one hand, movable along the longitudinal axis D and, on the other hand, arranged in a rotationally inhibited manner relative to the housing 2.

[0036] The first longitudinal section 11.1 of the threaded pin 11 extends through the recess 15 and projects into the bore 3.1 of the piston 3. The internal thread 20 of the support unit 14 and the external thread 12 of the threaded pin 11 are matched to one another such that, in a first operating position A, the internal thread 20 is in threaded engagement with the external thread 12 of the first longitudinal section 11.1 of the threaded pin 11.

[0037] If the device 1 is in the first position A and the drive unit 10 is activated, the threaded pin 11 is rotated by the drive unit 10. The support unit 14, which is arranged in a rotationally inhibited manner relative to the housing 2 and which is in threaded engagement with the threaded pin 11, is moved along the longitudinal axis D and in the direction of the piston 3. The piston 3, which is supported on the support unit 14, is also moved along the longitudinal axis D. The movement of the piston 3 is transferred to the tool 4, so that a working process, which is a cutting and / or pressing process, is carried out. The working process can preferably be ended automatically depending on a control unit (not shown) when a predetermined travel path and / or a force and / or a force curve has been reached. Once the working process has been carried out, the piston 3 can be moved back to its starting position.This can be done, for example, by reversing the direction of rotation of the drive unit 10.

[0038] The support unit 14 comprises in the Figuren 1 bis 3 illustrated embodiment, a first 14.1 and a second support element 14.2. The first 14.1 and second 14.2 support elements are arranged one behind the other in the direction of the longitudinal axis D in the region of the first longitudinal section 11.1 of the threaded pin 11 and are displaceable orthogonally to the longitudinal axis D and opposite to one another.

[0039] The first support element 14.1 has a first recess 15.1 with a first internal thread 20.1. The second support element 14.2 has a second recess 15.2 with a second internal thread 20.2. The first 15.1 and the second 15.2 recesses form the recess 15. The first internal thread 20.1 and the second internal thread 20.2 form the internal thread 20 in the recess 15. The first internal thread 20.1 and the second internal thread 20.2 are each arranged on opposite inner circumferential sections of the respective recess 15.1, 15.2. The first 15.1 and the second 15.2 recesses preferably have an oval shape in cross section. The first 15.1 and the second 15.2 recess are each dimensioned such that they each have a free space 17.1, 17.2 which is large enough that when the first 14.1 and the second 14.2 support element are moved, the first 20.1 and the second 20.2 internal thread and the external thread 12 of the threaded pin 11 come out of thread engagement.

[0040] The support unit 14 is designed such that, in the first operating position A, the internal thread 20, which is formed by the first internal thread 20.1 on the first support element 14.1 and the second internal thread 20.2 on the second support element 14.2, is in threaded engagement with the external thread 12 of the threaded pin 11. In a second operating position B, the internal thread 20 and the external thread 12 of the threaded pin 11 are out of threaded engagement, and the support unit 14 releases the threaded pin 11. Once the second operating position B is reached, the threaded pin is partially located in a free space 17 that encompasses the first 17.1 and second 17.2 free spaces.

[0041] The device 1 has a guide through which the support unit 14 is guided in the direction of the longitudinal axis D. The guide comprises two spaced-apart bars 40.1 and 40.2, between which the support unit 14 is guided. The bars 40.1 and 40.2 also form an abutment for the support unit 14. Possible torques that can be introduced into the support unit 14 by the threaded pin 11 are absorbed by the bars 40.1 and 40.2.

[0042] The Figuren 2a,b and 3a,b show schematically a cross-section of the device for cutting and pressing operations in the first operating position and in the second operating position. Figuren 2a , and 3a , it can be seen that the first support element 14.1 has two elongated holes 41.1 and 41.2 arranged at a distance from one another and extending orthogonally to the longitudinal axis D.

[0043] A guide pin 42.1 and 42.2, respectively, extends through the elongated hole 41.1 and 41.2. The guide pins 42.1 and 42.2 are connected to the second support element 14.2, so that the first support element 14.1 and the second support element 14.2 are guided during opposing displacement. The guide pins 42.1 and 42.2 each have a head. This configuration prevents displacement of the support elements 14.1 and 14.2 relative to one another in the direction of the longitudinal axis D.

[0044] An actuating unit 19 is connected to the support unit 14. By means of the actuating unit 19, the support unit 14 can be moved from the first operating position A to the second operating position B and vice versa. The actuating unit 19 has a shaft 23 which is rotatably mounted on the housing 2 and extends in the direction of the longitudinal axis D, as can be seen from the Fig. 1 can be seen. A spreading unit 22 is connected to the shaft 23. The spreading unit 22 is movable along the shaft 23 on the one hand and is rotationally inhibited relative to the shaft 23 on the other hand. For this purpose, the shaft 23 in the preferred embodiment has a rectangular cross-section, as can be seen from the Figuren 2a,b and 3a,b can be seen. The spreading unit 22 has a receptacle 26 through which the shaft 23 extends. The cross section of the receptacle 26 is designed to correspond to the cross section of the shaft 23.

[0045] The spreading unit 22 has a first spreading element 22.1 and a second spreading element 22.2, which are preferably connected to one another in a rotationally fixed manner. The spreading unit 22 is preferably formed in one piece. The first spreading element 22.1 engages in the first recess 15.1 of the first support element 14.1. The second spreading element 22.2 engages in the second recess 15.2 of the second support element 14.2. The shape of the spreading elements 22.1, 22.2 and the recesses 15.1, 15.2 are selected such that the support elements 14.1, 14.2 can be transferred from the first A to the second B operating position by rotating the shaft 23.

[0046] The first recess 15.1 and the second recess 15.2 of the first 14.1 and the second 14.2 support element have a sufficient first 17.1 and second 17.2 free space to bring the respective internal thread 20.1, 20.2 of the respective support element 14.1, 14.2 and the external thread 12 of the threaded pin 11 out of threaded engagement with one another in the second operating position B.

[0047] A preferred embodiment of the spreading unit 22 is the Figuren. 2a,b and 3a,b. From Fig. 2a It can be seen that the first expansion element 22.1 is prism-shaped. The second expansion element 22.2 is also prism-shaped, as can be seen from the Figur 2b The essentially triangular base of the first expansion element 22.1 is oriented orthogonally to the longitudinal axis D.

[0048] From the illustration Fig. 2a It can be seen that longitudinal edges 32.1, 32.2, 32.3 of the first expansion element 22.1 are cam-shaped. The reference symbol E denotes the distance from the center point M of the first expansion element 22.1, which coincides with the axis of the shaft 23, to the respective longitudinal edge 32.1, 32.2, 32.3. The distance E of each longitudinal edge 32.1, 32.2, 32.3 is the same. The longitudinal edges 32.1, 32.2, 32.3 are arranged equidistant from one another on an imaginary circumference. The longitudinal edges 32.1, 32.2, 32.3 are in contact with an inner circumferential surface of the first recess 15.1. The inner lateral surface has sections 33.1, 33.2, and 33.3, along which the respective longitudinal edge 32.1, 32.2, 32.3 slides during pivoting of the expansion element 22.1. Each section 33.1, 33.2, and 33.3 has a first elevation 34.1, 34.1, 34.3 and a second elevation 35.1, 35.2, 35.3, wherein the respective first and second elevations 34.1, 34.2, 34.3; 35.1, 35.2, 35.3 are formed spaced apart from one another. For example, the section 33.1 belonging to the longitudinal edge 32.1 has the second elevation 35.2 following the first elevation 34.1. In the first operating position A, the longitudinal edge 32.1 is located at the first elevation 34.1. By rotating the spreading unit 22, the first spreading element 22.1 is moved out of the position shown in the . Fig. 2a shown position, in which in the Fig. 3a shown position, which corresponds to the second operating position B. In the second operating position B, the longitudinal edge 32.1 is located on the second elevation 35.2. The longitudinal edge 32.1 can be moved between the first elevation 35.1 and the second elevation 35.2 and vice versa. The same applies to the two other longitudinal edges 32.2 and 32.3. Thus, the longitudinal edge 32.2 is transferred from the first elevation 34.2 to the second elevation 35.2. The longitudinal edge 32.3 is transferred from the first elevation 34.3 to the second elevation 35.3.

[0049] If the shaft 23 is rotated, the first expansion element 22.1 is also rotated. The respective longitudinal edge 32.1, 32.2, 32.3 is rotated accordingly. The respective longitudinal edge 32.1, 32.2, 32.3 describes a path that lies on an imaginary circumference of a circle with the radius E, which corresponds to the distance E of the longitudinal edges 32.1, 32.2, 32.3 to the center of the shaft 23. The first support element 14.1 is thereby moved in the direction of the arrow F from the first operating position A to Fig. 2a into the second operating position B after Fig 3a orthogonally to the longitudinal axis D. The displacement causes the first internal thread 20.1 of the first support element 14.1 and the external thread 12 of the threaded pin 11 to become disengaged from each other. The first support element 14.1 releases the threaded pin 11.

[0050] Starting from the first operating position A, as shown in the Fig. 2a As shown, the first arcuate section 33.1 has a distance X from the center of the shaft 23 which is greater than the radius. Starting from the first operating position A, as shown in the Fig. 2a As shown, the second arcuate section 33.2 has a distance Y from the center of the shaft 23 which is smaller than the radius. Starting from the first operating position A, as shown in the Fig. 2a As shown, the third arcuate section 33.3 has a distance Z from the center of the shaft 23 which is greater than the radius.

[0051] During a rotation of the first expansion element 22.1, the second longitudinal edge 32.2 exerts a force on the second arcuate section 33.2, by means of which the first support element 14.1 is transferred from the first operating position A into the second operating position B.

[0052] The second expansion element 22.2 and the second support element 14.2 are designed correspondingly to the first expansion element 22.1 and the first support element 14.1 with the proviso that a rotation of the second expansion element 22.2 from the first operating position A into the second operating position B carries out a movement opposite to the arrow F, so that the second support element 14.2 is transferred from the first operating position A into the second operating position B, as can be seen from the Figuren 2b and 3b is evident.

[0053] A lever 25 is attached to the shaft 23, with which the shaft 23 can be manually pivoted into the corresponding operating position. For this purpose, the lever 25 in this embodiment is folded in the first operating position A and unfolded in the second operating position B. In principle, however, a reversed position of the lever 25 is also possible.

[0054] The device 1 has a return unit 21, which is formed by a compression spring 21.1. The compression spring 21.1 is helical and surrounds the piston 3. The second end 6 of the piston 3 has a radially outwardly directed and circumferential collar 61. In the Fig.1 In the illustrated embodiment, a guide bushing 27 is provided in the housing 2, through which the piston 3 extends. The guide bushing 27 has an internal, circumferential groove 27.1 with a shoulder 27.2. The shoulder 27.2 and the collar 61 each form a stop for the compression spring 21.1.

[0055] To perform a work process, which may be a cutting and / or pressing process, the support unit 14 is in operating position A. This means that the support unit 14 is in threaded engagement with the threaded pin 11. Activating the motor 31 causes the threaded pin 11 to rotate. The rotational movement of the threaded pin 11 is converted into a translational movement of the support unit 14. The support unit 14, against which the second end 6 of the piston 3 rests, acts on the piston 3, causing it to move toward the tool 4. During this movement, the compression spring 21.1 is compressed. The motor 31 remains activated until the work process is completed. To return the piston 3 to its original position, the direction of rotation of the motor 31 is reversed, causing the support unit 14 to return to its original position. The compressed compression spring 21 is released.1, whereby the force of the compression spring 21.1 acting on the collar 61 pushes the piston 3 back to the starting position.

[0056] If a situation arises during a work process in which rapid relief of the tool is necessary, for example to at least reduce the extent of an impairment or injury to an operator, this is initiated by actuating the lever 25. Actuating the lever 25 rotates the shaft 23. The rotational movement of the shaft 23 is translated into a translational movement of the support unit 14. The support unit 14 is brought into the second operating position B, in which the support unit 14 is out of threaded engagement with the threaded pin 11. The thread on the first longitudinal section 11.1 of the threaded pin 11 is released. The force of the compressed compression spring 21.1 acts on the released threaded pin 11, whereby the piston 3 and the tool 4 connected to the piston 3 are pushed into the starting position. The tool 4 is released.The support unit 14 remains in the second operating position B until it is actively moved into the first operating position A by actuating the lever 25 again.

[0057] This design of the device enables rapid release of the tool, particularly in an emergency situation, without having to reverse the direction of rotation of the motor 31. In the second operating position B, the motor 31 can still be active without causing the piston 3 and thus also the tool 4 to be actuated. List of reference symbols

[0058] 1 Device 2 Housing 3 Piston 3.1 Bore 4 Tool 5 First end 6 Second end 10 Drive unit 11 Threaded pin 11.1 First longitudinal section 11.2 Second longitudinal section 12 External thread 13 Stop 14 Support unit 14.1 First support element 14.2 Second support element 15 Recess 15.1 First recess 15.2 Second recess 17 Free space 17.1 First free space 17.2 Second free space 19 Actuating unit 20 Internal thread 20.1 First internal thread 20.2 Second internal thread 21 Return unit 21.1 Compression spring 22 Expansion unit 22.1 First expansion element 22.2 Second expansion element 23 Shaft 24 Bearing 24.1 First rolling bearing 24.2 second rolling bearing 25 lever 26 mount 27 guide bush 27.1 groove 27.2 shoulder 30 planetary gear 31 motor 32.1, 32.2, 32.3 longitudinal edge 33.1, 33.2, 33.3 section 34.1, 34.1, 34.3 first elevation 35.1, 35.1, 35.3 second elevation 40.1 first bar 40.2 second bar 41.1 first slot 41.2 second slot 42.1 first guide pin 42.2second guide pin 61collar Afirst operating position Bsecond operating position DLongitudinal axis EAdistance Mcenter point FParrow.

Claims

1. A device (1) for cutting and / or pressing operations, comprising a housing (2), a piston (3) which is arranged within the housing (2) for movement along a longitudinal axis (D), a tool (4) which is fastened to a first end (5) of the piston (3), a drive unit (10), a threaded pin (11) having an external thread (12) which is arranged coaxially to the longitudinal axis (D) and extends with a first longitudinal section (11.1) within the piston (3), wherein the threaded pin (11) is rotatably connected to the drive unit (30) about the longitudinal axis (D) in the region of a second longitudinal section (11.2), a support unit (14) which is movable along the longitudinal axis (D) and arranged in a rotationally inhibited manner relative to the housing (2), the support unit (14) being designed, with its end facing away from the drive unit, as a support for a second end (6) of the piston (3),wherein the support unit (14) has a recess (15) with an internal thread (20) formed therein in sections, so that in a first operating position (A), the internal thread (20) is in threaded engagement with the external thread (12) of the threaded pin (11), that in a second operating position (B), the internal thread (20) and the external thread (12) of the threaded pin (11) are out of threaded engagement with one another and the support unit (14) releases the threaded pin (11) in the second operating position, a return unit (21) which is fastened to the housing (2) and the piston (3), wherein the return unit (21) is designed to return the piston (3) and the support unit (14) to an initial position in the second operating position (B).

2. Device according to claim 1, wherein the internal thread (20) of the support unit (14) is formed over up to 180° in the recess (15).

3. Device according to claim 1 or 2, wherein the support unit (14) comprises a first support element (14.1) with a first recess (15.1) and a second support element (14.2) with a second opening (15.2), wherein the first and second support elements (14.1, 14.2) are arranged one behind the other in the direction of the longitudinal axis (D) and are displaceable orthogonally to the longitudinal axis (D) and opposite to one another, and the first opening (15.1) and the second recess (15.2) form the recess (15), wherein the first and second recesses (15.1, 15.2) each have an internal thread (20.1; 20.2) on sections lying opposite one another.

4. Device according to claim 3, wherein the support elements (14.1, 14.2) are displaceable against a spring force.

5. Device according to one of claims 1 to 4, wherein the support unit (14) is guided and displaceable.

6. Device according to one of claims 1 to 5, wherein an actuating unit (19) connected to the support unit (14) is provided, by means of which the support unit (14, 14.1, 14.2) can be displaced at least into the second operating position (B).

7. Device according to claim 6, wherein the actuating unit (19) has a shaft (23) rotatably mounted on the housing (2).

8. Device according to claim 7, wherein a spreading unit (22) is provided which is movable along the shaft (23) and is rotationally inhibited relative to the shaft (23), wherein the spreading unit (22) is arranged in a recess (15, 15.1, 15.2) of the support unit (14), wherein the shape of the spreading unit (22) and the recess (15) are selected such that by rotating the shaft (23) the support unit (14) can be transferred from the first (A) into the second (B) operating position.

9. Device according to one of the preceding claims, wherein the return unit (21) comprises a tension and / or compression spring.

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