Pressing tool

Description

[0001] The present invention relates to a crimping tool, in particular for crimping a conductor cable according to the preamble of claim 1.

[0002] Press tools of this type are known in numerous variations from the prior art, for example from DE 43 22 856 C1.

[0003] The tool described in this publication, with two handles that can be moved relative to each other and a crimping unit with a crimping drum arranged in a tool head with several crimping dies of different diameters, has proven itself in practice.

[0004] For feeding the respective wire ferrules, which are applied to a stripped end of a conductor cable during a crimping process, the tool according to DE 43 22 856 C1 has a transport device with a transport plate and a transport lever pivotally and spring-loaded relative to it, by which a strip of wire ferrules, which is stored in a reservoir in the upper handle, is moved towards the crimping drum. In this process, the foremost of the wire ferrules is conveyed into the crimping die and then the wire ferrule is separated from the rest of the wire ferrule strip by a separating lever.

[0005] Depending on the diameter of the wire end ferrules to be used, it is necessary to adjust this transport device to the respective size of the wire end ferrules to be used.

[0006] The object of the present invention is to further develop a pressing tool in such a way that an adjustment of the transport device to the respective size, here the diameter of the wire end ferrules, is no longer necessary.

[0007] This problem is solved by a press tool having the features of claim 1.

[0008] The pressing tool according to the invention has two handles that are movable relative to each other.

[0009] The crimping tool further comprises a crimping unit with a crimping drum arranged in a tool head of the crimping tool, the crimping drum having at least one crimping die. The crimping unit further comprises a reservoir for storing a strip of wire end ferrules connected together in a belt-like fashion.

[0010] A transport device of the crimping tool, which can be moved in the direction of the crimping drum and is pre-tensioned, serves to transport the wire end ferrule strip from the depot towards the crimping drum.

[0011] The transport device has a transport plate and a transport lever arranged pivotally and spring-loaded to it, with a projection near the crimp drum that can be pressed between adjacent wire end ferrules.

[0012] A hold-down device is arranged between the transport device and a support surface of a head shell of the tool head. This hold-down device springs against the support surface and presses the transport plate against the transport lever.

[0013] By arranging such a hold-down device, a pressing tool is provided in which the adjustment of the transport device to the size of the wire end ferrules is virtually automatic.

[0014] Advantageous embodiments of the invention are the subject of the dependent claims.

[0015] According to an advantageous embodiment, the hold-down device has a spring retaining bridge on which a spring element is held, which is supported on the support surface of the head shell.

[0016] According to a first embodiment, this spring element is designed as a compression spring, which is held on the spring retaining bridge by being fitted over a spring holder designed as a projection.

[0017] In an alternative design variant, the spring element is designed as a leaf spring, which is held on the spring retaining bridge by a clamp-like spring holder.

[0018] Both types of spring elements enable a cost-effective and reliable adjustment of the transport device to the respective diameters of the wire end ferrules.

[0019] According to a further advantageous embodiment, the hold-down has at least one arm which, in a crimping drum-closed ferrule cutting position of the transport device, rests against the ferrule adjacent to the ferrule to be cut off.

[0020] This makes it easy to ensure that the second foremost ferrule of the ferrule strip is reliably pressed against the tray on which the ferrule strip rests and cannot be lifted during a cutting process by inserting a knife between the two foremost ferrules, regardless of the diameter of the ferrules.

[0021] According to a preferred embodiment, the hold-down has two arms of different lengths, with a distance between the arms being dimensioned such that a pressure surface of a shorter arm can be pressed onto a shell surface of a sleeve head and a pressure surface of a longer arm can be pressed onto a shell surface of a sleeve neck of the wire end sleeve.

[0022] According to a further advantageous embodiment of the press tool according to the invention, the spring constant of a spring element that pushes the transport plate and the transport lever apart is smaller than the spring constant of the spring element held on the spring retaining bridge of the hold-down device.

[0023] This effectively prevents the wire end ferrules from being moved away from the crimping drum along with the crimping tip when the transport device is moved away from the crimping drum.

[0024] According to another preferred embodiment, the hold-down has two retaining arms with which the hold-down is held on side walls of the head shell of the tool head.

[0025] This allows for easy attachment of the hold-down device to the head shell of the tool head.

[0026] According to a further advantageous embodiment of the press tool according to the invention, a strip guide is arranged in one area of ​​the depot.

[0027] According to a preferred further development, the strip guide is located in a rear housing half of a housing of the first handle.

[0028] This effectively prevents the wire end ferrule strip from falling out.

[0029] Preferred embodiments are explained in more detail below with reference to the accompanying drawings. They show: Figure 1 shows a side view of an embodiment of a pressing tool according to the invention; Figure 2 shows a schematic perspective partial sectional view of a section of a tool head and a handle shell of the first handle adjoining it, and a transport device and hold-down device arranged in the area of ​​the tool head; Figure 3 shows a side view of the Figure 2 The arrangement shown, Figure 4 a perspective view of the section of the tool head from below with the hold-down removed, Figure 5 a perspective view of the hold-down, Figure 6 one of the Figure 2 corresponding illustration with compression spring arranged on the hold-down, Figure 7; a perspective view of the hold-down with compression spring arranged on it, Figures 8 and 9. Figures 6 and 7corresponding illustrations with a spring element designed as a leaf spring, arranged on the hold-down device and Figure 10 an isometric illustration of a section of a depot for storing wire end sleeve strips with strip guide arranged on it.

[0030] In the following figure descriptions, terms such as top, bottom, left, right, front, back, etc., refer exclusively to the exemplary representation and position of the crimping tool, handle, crimping unit, crimping drum, transport device, transport plate, transport lever, hold-down device, and the like as chosen in the respective figures. These terms are not to be understood as restrictive; that is, these references may change due to different working positions, mirror-symmetrical design, or similar factors.

[0031] In Figure 1 Reference numeral 1 denotes a variant embodiment of a pressing tool according to the invention.

[0032] The pressing tool has two hand levers, 2 and 3.

[0033] The upper hand lever 2 has a handle shell 21 which is mounted about a pivot axis 28 on a handle housing 27 which extends into the area of ​​a tool head 12 of the pressing tool 1.

[0034] The lower hand lever 3 is pivotably mounted on a lower area of ​​the tool head 12.

[0035] Instead of operating the pressing tool 1 by the hand levers 2, 3, it is also conceivable to design the pressing tool 1 as an automatic or semi-automatic pressing tool with a motor drive.

[0036] The pressing tool 1 has in particular a crimping unit 4, with a crimping drum 41 arranged in the tool head 12 of the pressing tool 1.

[0037] The crimping drum 41 has at least one crimping die. The crimping die is preferably spring-mounted in a die holder of the crimping drum 41 in order to be able to process wire end ferrules 11 with different diameters.

[0038] It is also conceivable to use a crimping drum with several crimping dies with different diameters in order to be able to process wire end ferrules 11 with different dimensioned diameters.

[0039] The crimping unit 4 also includes a depot for storing a strip 10 of wire end ferrules 11 connected together in a belt-like manner, as exemplified in Figure 10Each of the wire end ferrules 11 has a ferrule head 111 and a ferrule neck 112, wherein the ferrule neck 112 encloses the receiving wire ends freed from insulating material and the ferrule head 111 encloses the area of ​​a conductor end of an electrical conductor where the conductor strands are still surrounded by insulating material.

[0040] For the basic operating principle of the pressing tool 1 and in particular the crimping unit 4, reference is hereby made to the disclosure of the above-mentioned DE 43 22 856 C1.

[0041] What's next in Figure 10 As can be seen, the wire end ferrules 11 are connected to each other in the area of ​​the ferrule head 111 by thin-walled webs and thus form a strip 10 of wire end ferrules 11 connected together in a belt-like manner.

[0042] For the storage of such a wire end ferrule strip 10, a storage track 25 is formed on the upper of the hand lever 2 in the handle housing 27, on which such a wire end ferrule strip 10 rests.

[0043] To move such a wire end ferrule strip 10 towards the crimping drum 41, the crimping tool 1 has a transport device 6 that is pre-tensioned and movable towards the crimping drum 41. This transport device 6 has, as shown in the Figures 2 to 4 The illustration shows a transport plate 62 and a transport lever 61 which is pivotable and spring-loaded relative to it.

[0044] The transport lever 61 has a projection 64 near the crimp drum 41, which can be pressed downwards in the direction of the depot track 25 between adjacent wire end ferrules 11 of the strip 10.

[0045] At the end of the transport lever 61 furthest from the projection 64, the transport lever 61 is connected to the transport plate 62 via a pivot joint 65. In a region between projection 64 and pivot joint 65, a pin 66 is formed on the surface of the transport lever 61 facing the transport plate 62. This pin extends through a recess in the transport plate 62 and limits the maximum pivot angle between the transport lever 61 and the transport plate 62.

[0046] On this mandrel 66, a compression spring 63 is mounted below the transport plate 62, which preloads the transport plate 62 relative to the transport lever 61.

[0047] What next in the Figures 2 to 4As can be seen, the transport plate 62 extends further towards the first hand lever 2 in the form of a web-like extension 67, which is surrounded by a further spring 68 designed here as a compression spring, which preloads the entire transport device 6 towards the crimp drum 41.

[0048] In order to push the transport device 6 away from the crimping drum 41 against the spring force of the spring 68 in the direction of the first hand lever 2, a ramp 69 is provided on the transport device 6, against which a projection (not shown) provided in a rear of the crimping drum 41 abuts, which is guided along the ramp 69 when the crimping drum 41 is rotated about a crimping drum rotation axis and thereby pushes the transport device 6 away from the crimping drum 41 against the spring force of the spring 68.

[0049] In order to always ensure sufficient counter-pressure on the wire end ferrule strips 10 for carrying out a separation process of the foremost of the wire end ferrules 11, depending on the size, i.e. diameter of the wire end ferrules 11, the crimping tool 1 has a hold-down device 5 which is arranged between the transport device 5 and a support surface 24 of the head shell 22 of the tool head 12.

[0050] The hold-down device 5 is spring-loaded upwards against the support surface 24 and is thus able to press the transport plate 62 sufficiently against the transport lever 61, so that during a separation process of the foremost of the wire end ferrules 11 from the wire end ferrule 11 arranged behind it, when a cutting edge presses from below against the bridge between two adjacent wire end ferrules 11, the wire end ferrule strip 10 is sufficiently held in its position and an upward push of the wire end ferrule strip 10 is prevented, which would result in the foremost wire end ferrule 11 not being separated.

[0051] The in Figure 5 , 7 and 9 The hold-down device 5 shown in detail has a spring retaining lug 55 on which a spring element 57, 58 is held, which is supported on the support surface 24 of the head shell 22, as shown in the Figure 6 and 8 It is clearly visible.

[0052] During the Figures 6 and 7In the embodiment shown, the spring element 57 is designed as a compression spring, which is held on the spring retaining bridge 55 by means of a spring holder 56 designed as a projection.

[0053] During the Figures 8 and 9 In the embodiment shown, the spring element 58 is designed as a leaf spring, which is held on the spring retaining web 55 by a clamp-like spring holder 56'.

[0054] What next in the Figures 2 to 9 As shown, the hold-down device 5 has at least one, and in the embodiments shown here two, arms 52 which are in one of the wire end ferrule cutting positions of the transport device 6 near the crimping drum 41, as exemplified in the Figures 2 and 3 is shown where the end sleeve 11 to be cut off is adjacent to the end sleeve 11.

[0055] The distance between the arms 52 of the hold-down device 5 is preferably dimensioned such that a pressure surface 521 of a shorter arm can be pressed onto a lateral surface of a sleeve head 111 of the wire end sleeve 11 and a pressure surface 521 of a longer arm can be pressed onto a lateral surface of a sleeve neck 111 of the wire end sleeve 11.

[0056] The hold-down device 5 further comprises a base body 51, from which arms 52 extend vertically downwards in the plane defined by the base body 51. At the end of the base body 51 furthest from the arms 52, two retaining arms 53 extend in the plane of the base body 51, with which the hold-down device 5 is held against the side walls of the head shell 22 of the tool head 12.

[0057] Preferably, grooves 54 are provided at the ends of the retaining arms 53, which engage in corresponding projections (not shown) on the side walls of the head shell 22.

[0058] Furthermore, projections 59 are preferably provided on the side of the base body 51 facing the transport device 6, which press against the top of the transport plate 62 facing the hold-down device 5.

[0059] The spring constant of the spring element 57, 58 fixed to the hold-down device 5 is preferably greater than the spring constant of the compression spring 63 which preloads the transport lever 61 against the transport plate 62, in order to ensure, on the one hand, sufficient counter-pressure exerted by the arms 52 of the hold-down device 5 during a cutting process of the foremost wire end sleeve 11, and on the other hand, to still allow the extension 64 to slide over the wire end sleeves 11 resting on the depot track 25 when the transport device 6 is moved away from the crimp drum 41.

[0060] What's next in Figure 10 As can be seen, a strip guidance 26 is arranged in the area of ​​depot 13.

[0061] The strip guide 26 is designed here as a guide rib, with a lateral guide 261 extending parallel to the longitudinal extent of the strip 10, against which the end faces of the sleeve necks 112 can abut, and a projection 262 that overlaps the ends of the sleeve necks 112 spaced apart from the sleeve head 111 and thus reliably prevents the wire end sleeve strips 10 from falling out.

[0062] The strip guide 26 is preferably located in the area of ​​a rear housing half of the housing 27 of the first hand lever 2. Reference symbol list

[0063] 1 Press tool 2 First hand lever 21 Handle shell 22 Head shell 23 Cover 24 Support surface 25 Depot track 26 Strip guide 261 Side guide 262 Projection 27 Handle housing 28 Swivel axis 3 second hand lever 4 crimping units, 41 crimping drums 5 Hold-down 51 Base body 52 Arm 521 Pressure surface 53 Holding arm 54 Groove 55 Crossbar 56 Spring holder 57 Coil spring 58 Leaf spring 59 Projection 6 Transport device 61 Transport lever 62 Transport plate 63 Compression spring 64 Attachment 65 Swivel joint 66 Mandrel 67 Extension 68 Spring 69 Ramp 7 Cutting unit 8 Lower clamping jaw 9 Stripping unit 10 Strip 11 Wire end ferrule 111 Sleeve head 112 Sleeve neck 12 Tool head 13 Depot

Claims

1. A pressing tool (1), comprising - two manual levers (2, 3) movable relative to one another, - a crimping unit (4) with a crimping drum (41) arranged in a tool head (12) of the pressing tool (1) and having at least one crimping die and a depository (13) for storing a strip (10) of ferrules (11) connected to one another in the form of a belt, - a transport device (6) movable in a prestressed manner in the direction of the crimping drum (41) to transport the ferrule strip (10) from the depository (13) in the direction of the crimping drum (41), - the transport device (6) having a transport plate (62) and a transport lever (61), which is arranged pivotably and in a sprung fashion relative to said transport plate and which has an attachment (64) which is close to the crimping drum (41) and can be pressed in between adjacent ferrules (11), characterized in that - there is arranged, between the transport device (6) and a support surface (24) of a head cap (22) of the tool head (12), a holding-down device (5) which is supported in a sprung fashion on the support surface (24) and which presses the transport plate (62) against the transport lever (61).

2. The pressing tool (1) according to claim 1, characterized in that the holding-down device (5) has a spring-retaining web (55) on which there is retained a spring element (57, 58) which is supported on the support surface (24) of the head cap (22).

3. The pressing tool (1) according to claim 2, characterized in that the spring element (57) is formed as a compression spring, which, placed over a spring retainer (56) formed as a protrusion, is retained on the spring-retaining web (55).

4. The pressing tool (1) according to claim 2, characterized in that the spring element (58) is formed as a leaf spring, which is retained on the spring-retaining web (55) via a spring retainer (56') formed like a bracket.

5. The pressing tool (1) according to any of the preceding claims, characterized in that the holding-down device (5) has at least one arm (52), which when the transport device (5) is in a ferrule detachment position close to the crimping drum (41), abuts on the ferrule (11) which is adjacent to the ferrule (11) to be detached.

6. The pressing tool (1) according to claim 5, characterized in that the holding-down device (5) has two arms (52) of different length, wherein the spacing between the arms (52) is of such a size that a press-on surface (521) of a shorter arm can press onto a shell surface of a sleeve head (111) of the ferrule (11) and a press-on surface (521) of a longer arm (52) can press onto a shell surface of a sleeve neck (112) of the ferrule (11).

7. The pressing tool (1) according to any of the preceding claims, characterized in that a spring constant of the compression spring (63) which presses the transport plate (62) and the transport lever (61) away from one another is smaller than the spring constant of the spring element (57, 58) which is retained on the spring-retaining web (55) of the holding-down device (5).

8. The pressing tool (1) according to any of the preceding claims, characterized in that the holding-down device (5) has two retaining arms (53) with which the holding-down device (5) is retained at side walls of the head cap (22) of the tool head (12).

9. The pressing tool (1) according to any of the preceding claims, characterized in that a strip guide (26) is arranged in the region of the depository (13).

10. The pressing tool (1) according to claim 9, characterized in that the strip guide (26) is attached in the region of a rear housing half of a housing (27) of the first manual lever (2).