Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
  • B26F1/14—Punching tools; Punching dies

Definitions

• the present invention relates to a rotary tool for punching holes in running material webs, in particular paper webs, according to the preamble of claim 1.
• Continuous paper webs such as those used for form sets or • in data processing systems, generally have a transport perforation on the edge.
• one or more pairs of disks are arranged on one or both sides of the running paper web, between which the paper web is passed.
• One disc has the punch pins
• the counter disc has the sleeves, in which the punch pins engage in a meshing manner, so that the individual holes are punched out.
• the disk receiving the punching pins is pierced in the area of its periphery, so that it is narrower on the outside than in the middle area.
• segments are clamped by means of parallel screws, with the aid of which the punching pins are fastened.
• the disc in the recessed area and on the other hand the segments on their inside facing the disc have radially extending half-shells which receive the punching pins.
• two punch pins are clamped by a segment.
• the pins can also be clamped individually using screws.
• the punch pins are made of a relatively soft material, while the sleeves are hardened.
• the punch pins therefore wear out faster than the sleeves and must therefore be replaced from time to time. This is done by loosening the segments or the screws, removing the punch pins, inserting new punch pins and fastening them again using the segments or screws. Since a punching tool has a large number of punching pins, it is readily apparent that the changeover involves a considerable amount of work and a correspondingly long downtime for the machine.
• OP are attached to a band-shaped carrier, which is wound in a helical line on a roller body.
• the carrier is held by a band-shaped spacer which also extends helically between its turns.
• the attachment or detachment of all perforating elements to or from the roller body can be done by unwinding or winding up the band-shaped carrier, but this winding and unwinding is quite complex, but at the same time the spacer is also attached or detached. In addition, appropriately trained, rather complicated tools are required for this. Since the perforating elements are formed in one piece with the carrier, the perforating elements and the carrier cannot be produced from different materials, or only with considerable effort.
• the present invention is based on the object of designing a punching tool of the type mentioned at the outset in such a way that all or only some of the punching pins can be replaced quickly and easily without the correct functioning of the punching tool being impaired thereby.
• the punch pins are preferably held at their rear ends in sleeves connected to the carrier, which engage in the recesses on the holder. It is advantageous if the punch pins are provided with a profiling, at least in their area seated in the sleeves of the carrier, and the sleeves have an inner diameter that is slightly smaller than the largest outside diameter of the punch pins. As a result of this design, the material of the sleeves penetrates into the profiling at the latest when the carrier is fastened on the holder, so that the punching pins are stuck and cannot slip axially.
• the punch pins can have circumferential grooves, e.g. in the form of thread grooves.
• OMPI slightly larger than the diameter of the recesses in the holder, so that when the sleeves of the carrier are inserted into these recesses, the sleeves are squeezed radially. This also ensures that they are firmly seated in the recesses. On the other hand, this causes the material of the sleeves to be displaced into the profiling of the punching pins, so that their fixing in the assembled state is further improved.
• the carrier with the sleeves is made of plastic.
• a carrier can be produced, for example, as an endless belt.
• the punch pins can subsequently be pressed in by machine or can be injected or embedded in the mold when the carrier is being produced.
• Such an endless belt can be cut to the desired length, i.e. Cut the entire circumference of the carrier or a part thereof to length, so that it is easy to adapt to the structural dimensions of the individual carriers without any waste.
• the punch pins are in a non-positive connection at their rear end with the walls of the recesses in the holder.
• claims 22-26 are a device for attaching the carrier and claim 27 is a device for pulling a carrier from the holder suggested.
• FIG. 1 is a side view of a punching tool with an assembly tool
• Fig. 2 is an enlarged, partially sectioned
• FIG. 3 shows a detail of a linear development of the holder of the punching tool in a sectional view with a tool for pulling off the carrier
• Fig. 5 is a plan view of that shown in Fig. 3
• Fig. 6 shows a section along the line VI-VI in
• Fig. 7 is an enlarged, partially sectioned
• a punching tool 2 for attaching the transport perforation to endless, possibly multilayer paper webs 1 is shown in the figures, which consists of a disk-shaped holder 3 and a likewise disk-shaped counter-holder 4, which are arranged one above the other and touch on the circumferential side and between which the paper web 1 passes.
• the 'transport devices for the Panda ⁇ web 1 are conventional and not shown in detail.
• the upper holder 3 is provided at regular intervals with radial punching pins 5.
• sleeves 6 (FIG. 2) are provided on the counter-holder, which generally consist of hardened material, while the punch pins 5 are made of softer material.
• the pins 5 project beyond the circumference of the holder 3 to such an extent that they mesh with one another in the sleeves 6 of the counter holder 4.
• the portion thereof which passes under a punch pin 5 is pressed into the sleeve 6 and punched out on the upper edge of the perforation of the sleeve 6, so that the paper web 1 is provided with a transport perforation 7 behind the punch tool 2 (Fig. 2).
• the punching waste falls into the sleeve 6 and a bore that continues towards the center of the counter-holder 4.
• the design and arrangement of the punch pins is shown in more detail in FIGS. 3 and 4.
• the holder 3 of the punching tool 2 has, on its circumference, radially extending blind holes 8, the division of which corresponds to the division of the punching pins 5.
• the punch pins 5 are on a band-shaped Arranged carrier 10, which consists for example of plastic and in the present case has a length corresponding to the circumference of the holder 3.
• the back of the support 10 has sleeves 9 formed integrally with it, the outside diameter of which is somewhat larger than the inside diameter of the blind holes 8. By means of these sleeves 9, the support 10 can be fixed in the bores 8 of the holder 3 by frictional engagement.
• the punching pins 5 which project beyond the carrier 10 by a certain amount at the front thereof, are firmly seated in the sleeves 9.
• the punch pins 5 have a widened head 11 - similar to the head of a countersunk screw - the diameter of which is greater than that of the rear end 5a (shaft) of the punch pins 5.
• the sleeve 9 is approximately the same length as the one it receives Area 5a of the punch pins 5.
• the punching pin 5 is provided with a profile 12, for example in the form of thread grooves, at least in its area 5a seated in the sleeve 9, the outer diameter of the rear end 5a being larger than the inner diameter of the sleeve 9, so that the sleeve material is displaced into the profile 12 and the punch pin 5 is stuck in the sleeve 9.
• the sleeve 9 can be conical or rounded on the outside, in particular in the region of its end;
• the bores 8 it is also possible for the bores 8 to be conically tapered.
• the head 11 has already been deformed into an approximately cylindrical shape. This deformation occurs after a few revolutions of the punching tool, so that the head 11 fits snugly into the sleeve 9 on the counter-holder 4.
• the holder 3 can have a groove 13 on its circumference, in which the carrier tape is arranged sunk.
• the width of the groove 14 corresponds approximately to the width of the band-shaped carrier 10.
• the depth of the groove is less than the thickness of the carrier 10, so that it does not protrude beyond the circumference of the holder 3.
• the punching pins 5 may subsequently be used or in the sleeves 9 of the • support 10 but are embedded in the sleeve 9 on the occasion of production of the support 10 degrees.
• a device with a pressing tool 14 for mounting the carrier 10 is schematically indicated reasonable • the holder 3. Similar to the tool support of a machine tool, it is arranged on the machine carrying the punching tool 2 and can be adjusted both in the direction of the holder 3 and also axially parallel to the latter.
• the guides used for this purpose are only indicated schematically, for example the guide 23 for the longitudinal displacement.
• the tool 14 has a pressure surface 15 with which it acts on the edges of the carrier 10 and a groove 16, the dimensions of which are larger than that of the punching pins 5.
• the carrier is punched with a sleeve 9 into a blind hole 8 of the holder 3 and, with the holder 3 rotating, by means of the Pressure surface 15 of the delivered tool 14 is pressed against the circumference of the holder 3.
• a deliverable r in the tool 14 run centering member 21 which has at its end a centering pin 22 for engaging in one of the blind holes.
• the pressing tool 14 is in the standby or shown in FIG. Operating position fixed by means of pins 25, 26 and after loosening these pins can be pivoted about an axis 24 into a rest position, for example upwards, and held there again by means of pins.
• the mounting of the carrier 10 on the holder 3 can also be done in other ways, e.g. by means of a pressure roller which can be pressed against the holder 3 by spring force.
• a tool 17 for pulling the carrier 10 from the holder 3 is shown when an exchange of the punch pins 5 is necessary.
• the tool 17 consists of a curved strip, which is provided on one side with a longitudinal groove 18, the width of which is somewhat larger than the diameter of the head 11 of the punching pins 5, as shown in FIG. 5 with the punching pin 5 *. is shown.
• the groove 18 is provided with a constriction 19 at one end. In the area of this constriction 19, the wall of the groove 18 is undercut (FIG. 6) "such that the head 11 is engaged behind a punch pin 5 during the lateral sliding of the bar 17, as in the punch pin 5 '* in Figs. 5 and 6 is shown.
• the tool 17 with the constriction 19 is pushed onto the head 11 of a punch pin 5 * 'located at one end of the carrier 10 and this is pulled out by rolling the tool 17 on the circumference of the holder 3.
• Carrier 10 acting tensile force the sleeves 9 of the carrier 10 are successively pulled out of the blind holes 8 of the holder 3, the punch pins 5 migrating into the groove 18 of the tool 17.
• it can be provided with a profile or coating on its outer surface 20.
• FIG. 7 shows another embodiment of the carrier 10 holding the punch pins 5.
• the carrier 10 has no sleeves, so that the punch pin ends 5a projecting above the carrier 10 are exposed. With these free ends 5a, the punch pins 5 come into direct contact with the wall of the bores 8 and are held in the latter by frictional engagement. In order to ensure that the punch pins 5 are sufficiently firmly seated in the bores 8, the bores 8 and the rear end 5a of the punch pins 5 engaging in them are conical.
• the carrier 10 is made of a suitable compressible material, e.g. Foam rubber, produced, the carrier 10, which is elastically compressed during the stamping process, also serves to repel the paper web 1 from the stamping pins 5 when the stamping is released.
• a suitable compressible material e.g. Foam rubber
• the carrier 10 shown in FIGS. 1-6 can also be designed such that at least a part thereof can be elastically compressed.
• the carrier 10 is then able, just as described with reference to FIG. 7, to repel the paper web 1 from the punch pins 5 after the punching process.
• the carrier 10 is provided with two parallel rows of punch pins 5. Accordingly, the holder 3 has two parallel rows of bores 8. In this case it is of course also possible to attach two carriers 10, each with only one row of punch pins 5. In any case, the changeover time is reduced considerably in such an embodiment.
• the carrier 10 a length that corresponds to the circumference of the holder 3.
• the punch pins 5 can of course also have a different shape than the one shown in the figures. It is also possible to design the profile on the shaft 5a of the punching pins 5 differently than in the form of thread grooves 12.
• the punching tool described is suitable not only for making peripheral transport perforations, but also generally for punching out perforations of any kind. According to the perforations to be produced, the punching pins 5 are also to be arranged along the peripheral surface of the carrier 3. In such a case, the carrier 10 may have a shape other than a band.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6108884

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (7)

• 1981
  • 1981-08-04 JP JP56502551A patent/JPS57501123A/ja active Pending
  • 1981-08-04 EP EP19810902293 patent/EP0057225A1/de not_active Ceased
  • 1981-08-04 WO PCT/CH1981/000088 patent/WO1982000432A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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