US3845681A - Granulator for granulating plastic strands - Google Patents

Granulator for granulating plastic strands Download PDF

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Publication number
US3845681A
US3845681A US00351865A US35186573A US3845681A US 3845681 A US3845681 A US 3845681A US 00351865 A US00351865 A US 00351865A US 35186573 A US35186573 A US 35186573A US 3845681 A US3845681 A US 3845681A
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US
United States
Prior art keywords
metal strip
granulator
knife
knife cylinder
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00351865A
Inventor
R Fritsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CF Scheer und Cie GmbH and Co KG
Original Assignee
CF Scheer und Cie GmbH and Co KG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/485—Cutter with timed stroke relative to moving work
    • Y10T83/494—Uniform periodic tool actuation
    • Y10T83/501—With plural tools on a single tool support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9488—Adjustable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9488—Adjustable
    • Y10T83/949—Rectilinearly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9493—Stationary cutter

Definitions

  • the invention relates to a granulator for granulating plastics strands, which has a knife cylinder and a support for the incoming strands disposed longitudinally of the knife cylinder.
  • the knife cylinder of such granulators do not wear uniformly over their length. Accordingly, there is a change of distance between the knife cylinder and that edge of the support which is nearest to the knife cylinder; however, this distance is important for the quality of the manufactured granulate and in the normal case must not exceed 0.01 mm. In known granulators with a rigid knife beam as support for the plastics strands it is therefore not possible to produce a uniform and highquality granulate after the knife cylinder has been in use for some time.
  • the present invention provides a granulator for granulating plastics strands, comprising a knife cylinder; a support for incoming plastics strands disposed longitudinally of the cylinder, the support being in the form of a metal strip one edge of which is uppermost and retaining means for adjustably holding the strip so that its upper edge is adjustable in sections towards the knife cylinder.
  • the upright or nearly upright metal strip being resilient, may be readily deformed towards the knife cylinder in individual sections, so that the distance between its upper edge and the knife cylinder may thus be exactly adjusted over the entire length of the knife cylinder.
  • a particularly simple construction for the retaining means (in which the strip may nevertheless be effectively adjusted towards the knife cylinder) comprises at least two parts, the two parts forming a clamping device for the strip, which is accommodated in a slit defined by this clamping device, the upper part of the slit being open towards the knife cylinder to enable the metal strip to be adjusted. Accordingly, the undeformed zones of the metal strip bear practically as far as the upper edge on the outer part, which faces away from the knife cylinder.
  • the outer part may also be provided with a support surface for the incoming strands.
  • the construction of the adjusting facility of the metal strip is particularly inexpensive if the outer part of the clamping device, which faces away from the knife cylinder, is simply provided with adjusting screws disposed alongside the metal strip and positioned approximately perpendicularly thereto.
  • the drawing shows a machine frame 310 on which bearing units 14 are mounted on both ends of a knife cylinder 12.
  • the knife cylinder is covered by a hood 16 which exposes the knife cylinder above an anvil l8 and also forms a discharge (not shown) for the granulate.
  • a row of plastics strands 20 supported by the anvil 18 are delivered in the direction of the arrow A by feed means (not shown) and are then granulated by the knife cylinder 12.
  • the anvil 18 consists substantially of three parts, namely a main clamping member 22 and an inner clamping member or jaw 24, which together define a slit 26, and an anvil knife 28, disposed in the slit 26 and taking the fonn of a hardened sheet metal strip.
  • the anvil knife 28 is clamped by means of clamping screws 30 which extend through the main member 22 and tighten the clamping jaw 24 against the main member.
  • Eccentric screws 32 as well as adjusting screws 34 also extend through the main member 22.
  • a row of such screws which are serially disposed alongside the anvil knife 28 are of course provided in each case, that is to say extending perpendicularly to the plane of the drawing.
  • the eccentric screws 32 are each provided with an eccentric 32a which bears against the lower edge of the anvil knife 28. Adjusting of the eccentric screws therefore permits vertical. adjustment of the anvil knife.
  • the outer face of the anvil knife is acted on by the row of adjusting screws 34 so that rotation of them causes the upper edge of the knife 28 to be advanced towards the knife cylinder 12.
  • Lock nuts 34a are also provided for the adjusting screws 34.
  • a granulator for granulating plastic strands comprising a knife cylinder having a plurality of axially extending closely spaced knife edges disposed around the periphery of the cylinder and generally saw-toothed in radial section, a support for a plurality of incoming plastic strands to be granulated, said support including a flexible metal strip and a retaining means for adjustably holding said metal strip disposed in a plane generally tangential to an arc defined by said knife edges and with the upper edge of the metal strip disposed in coacting relationship with successive knife edges to successively shear the ends of the incoming plastic strands, said retaining means including means for deforming individual sections of the upper portion of the metal strip in a direction radially of the knife cylinder to compensate for longitudinally uneven wear of the knife edges.
  • the retaining means comprises a clamp having an outer clamping member supporting the surface of the metal strip facing away from the knife cylinder and having an inner clamping member which engages only along the der.
  • a granulator as claimed in claim 2 further comprising screws mounted on the clamp at right angles to the metal strip and each screw having an eccentric arranged for engagement with the strip for the vertical adjustment thereof.
  • each eccentric is arranged for engagement with the lower edge of the strip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A support for the incoming plastics strands is disposed longitudinally of a knife cylinder. The support is in the form of a metal strip mounted in retaining means with one of its edges uppermost. The upper edge is adjustable in sections towards the knife cylinder, to compensate for wear.

Description

Nov. 5, 1974 is in the form of a metal strip mounted in retaining means with pen- [56] References Cited UNITED STATES PATENTS 2,582,522 l/l952 Buttersby........,.,............... 3,196,724 7/l965 Frunk.......... 326L249 7/1966 Primary Examiner-J. M. Meister [57] ABSTRACT A support for the incoming plastics strands is disposed longitudinally of a knife cylinder. The support one of its edges uppermost. The upper edge is adjustable in sections towards the knife cylinder, to com sate for wear.
6 Claims, 1 Drawing Figure PLASTIQ STRANDS Inventor: Rudolf Paul Fritsch, Stuttgart,
Germany Assignee: Firma C. F. Scheer & Cie,
Baden-Wurttemberg, Germany Apr. 17, 1973 Foreign Application Priority Data Apr. 22, 1972 Germany............................ 2219784 83/3563, 83/699, 83/700, 83/856 Int. 823d 23/00, B29b 1/02 83/355, 356.3, 349, 700, 83/699, 612, 674, 356, 856-858 Unite States Patent Fritsch 41 GRANULATOR FOR GRANULATING 22 Filed:
21 Appl. No.: 351,865
[58] Field of Search GRANULATOR FOR GRANULATING PLASTIC STRANDS The invention relates to a granulator for granulating plastics strands, which has a knife cylinder and a support for the incoming strands disposed longitudinally of the knife cylinder.
The knife cylinder of such granulators do not wear uniformly over their length. Accordingly, there is a change of distance between the knife cylinder and that edge of the support which is nearest to the knife cylinder; however, this distance is important for the quality of the manufactured granulate and in the normal case must not exceed 0.01 mm. In known granulators with a rigid knife beam as support for the plastics strands it is therefore not possible to produce a uniform and highquality granulate after the knife cylinder has been in use for some time.
It is therefore an object of the invention to provide a construction which can take account of the irregular wear of the knife cylinder.
Accordingly, the present invention provides a granulator for granulating plastics strands, comprising a knife cylinder; a support for incoming plastics strands disposed longitudinally of the cylinder, the support being in the form of a metal strip one edge of which is uppermost and retaining means for adjustably holding the strip so that its upper edge is adjustable in sections towards the knife cylinder.
The upright or nearly upright metal strip being resilient, may be readily deformed towards the knife cylinder in individual sections, so that the distance between its upper edge and the knife cylinder may thus be exactly adjusted over the entire length of the knife cylinder.
A particularly simple construction for the retaining means (in which the strip may nevertheless be effectively adjusted towards the knife cylinder) comprises at least two parts, the two parts forming a clamping device for the strip, which is accommodated in a slit defined by this clamping device, the upper part of the slit being open towards the knife cylinder to enable the metal strip to be adjusted. Accordingly, the undeformed zones of the metal strip bear practically as far as the upper edge on the outer part, which faces away from the knife cylinder. The outer part may also be provided with a support surface for the incoming strands.
The construction of the adjusting facility of the metal strip is particularly inexpensive if the outer part of the clamping device, which faces away from the knife cylinder, is simply provided with adjusting screws disposed alongside the metal strip and positioned approximately perpendicularly thereto. By this simple means it is possible for the various sections of the metal strip to be effectively adjusted towards the knife cylinder almost independently of each other. it is advisable to provide locknuts for locating the adjusting screws.
It is also desirable to be able to adjust the support in the vertical direction. This can be easily achieved if screws with an eccentric are provided in the clamping device, below the metal strip for the vertical adjustment thereof. These screws may alternatively extend through apertures in the metal strip and need not necessarily be disposed below the metal strip.
The invention will be described further, by way of ex ample only, with reference to the accompanying drawing, which is an end view of part of a granulator, the
support for the incoming plastics strands being shown partially in section.
The drawing shows a machine frame 310 on which bearing units 14 are mounted on both ends of a knife cylinder 12. The knife cylinder is covered by a hood 16 which exposes the knife cylinder above an anvil l8 and also forms a discharge (not shown) for the granulate.
A row of plastics strands 20 supported by the anvil 18 are delivered in the direction of the arrow A by feed means (not shown) and are then granulated by the knife cylinder 12. The anvil 18 consists substantially of three parts, namely a main clamping member 22 and an inner clamping member or jaw 24, which together define a slit 26, and an anvil knife 28, disposed in the slit 26 and taking the fonn of a hardened sheet metal strip. The anvil knife 28 is clamped by means of clamping screws 30 which extend through the main member 22 and tighten the clamping jaw 24 against the main member.
Eccentric screws 32 as well as adjusting screws 34 also extend through the main member 22. A row of such screws which are serially disposed alongside the anvil knife 28 are of course provided in each case, that is to say extending perpendicularly to the plane of the drawing. The eccentric screws 32 are each provided with an eccentric 32a which bears against the lower edge of the anvil knife 28. Adjusting of the eccentric screws therefore permits vertical. adjustment of the anvil knife. The outer face of the anvil knife is acted on by the row of adjusting screws 34 so that rotation of them causes the upper edge of the knife 28 to be advanced towards the knife cylinder 12. Lock nuts 34a are also provided for the adjusting screws 34.
It is convenient if the upper edge of the anvil knife 28 is approximately flush with a support surface 22a formed on the main member 22. Where appropriate, it is also possible to provide lock nuts for the eccentric screws 32.
To adjust the distance between the anvil knife and the knife cylinder it is merely necessary to rotate the adjusting screws 34 when the anvil knife is clamped between the clamping jaw 24 and the main member 22, the resilience of the anvil knife permitting separate adjustment of different anvil knife zones.
1 claim:
1. A granulator for granulating plastic strands comprising a knife cylinder having a plurality of axially extending closely spaced knife edges disposed around the periphery of the cylinder and generally saw-toothed in radial section, a support for a plurality of incoming plastic strands to be granulated, said support including a flexible metal strip and a retaining means for adjustably holding said metal strip disposed in a plane generally tangential to an arc defined by said knife edges and with the upper edge of the metal strip disposed in coacting relationship with successive knife edges to successively shear the ends of the incoming plastic strands, said retaining means including means for deforming individual sections of the upper portion of the metal strip in a direction radially of the knife cylinder to compensate for longitudinally uneven wear of the knife edges.
2. A granulator as claimed in claim 1, in which the retaining means comprises a clamp having an outer clamping member supporting the surface of the metal strip facing away from the knife cylinder and having an inner clamping member which engages only along the der.
5. A granulator as claimed in claim 2, further comprising screws mounted on the clamp at right angles to the metal strip and each screw having an eccentric arranged for engagement with the strip for the vertical adjustment thereof.
6. A granulator as claimed in claim 5, in which each eccentric is arranged for engagement with the lower edge of the strip.
l l #k

Claims (6)

1. A granulator for granulating plastic strands comprising a knife cylinder having a plurality of axially extending closely spaced knife edges disposed around the periphery of the cylinder and generally saw-toothed in radial section, a support for a plurality of incoming plastic strands to be granulated, said support including a flexible metal strip and a retaining means for adjustably holding said metal strip disposed in a plane generally tangential to an arc defined by said knife edges and with the upper edge of the metal strip disposed in coacting relationship with successive knife edges to successively shear the ends of the incoming plastic strands, said retaining means including means for deforming individual sections of the upper portion of the metal strip in a direction radially of the knife cylinder to compensate for longitudinally uneven wear of the knife edges.
2. A granulator as claimed in claim 1, in which the retaining means comprises a clamp having an outer clamping member supporting the surface of the metal strip facing away from the knife cylinder and having an inner clamping member which engages only along the lower part of the face of the metal strip facing towards the knife cylinder, to permit adjustment of the upper edge of the metal strip.
3. A granulator as claimed in claim 2, in which the outer clamping member is formed with a support surface for the incoming strands.
4. A granulator as claimed in claim 2, further comprising adjusting screws in the outer clamping member, the ends of the screws being arranged to abut against the face of the strip facing awaY from the knife cylinder.
5. A granulator as claimed in claim 2, further comprising screws mounted on the clamp at right angles to the metal strip and each screw having an eccentric arranged for engagement with the strip for the vertical adjustment thereof.
6. A granulator as claimed in claim 5, in which each eccentric is arranged for engagement with the lower edge of the strip.
US00351865A 1972-04-22 1973-04-17 Granulator for granulating plastic strands Expired - Lifetime US3845681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2219784A DE2219784C3 (en) 1972-04-22 1972-04-22 Granulator for granulating plastic strands

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US3845681A true US3845681A (en) 1974-11-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100276834A1 (en) * 2007-09-17 2010-11-04 Jochen Scheurich Device for granulating plastic strands

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2515093A1 (en) * 1981-10-26 1983-04-29 Clayton Cie Plastics strip and sheet granulator mill - with thin, reversible, replaceable, self-aligning blades
EP0111038A1 (en) * 1982-12-02 1984-06-20 COMPAGNIE CLAYTON Société dite: Granulator for individual objects, especially of plastic material
DE3620015A1 (en) * 1986-06-13 1986-11-20 Fritz 5210 Troisdorf Bufe Device for pelletizing at least partly cooled plastic strands

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582522A (en) * 1947-08-15 1952-01-15 Masson Scott & Company Ltd Mounting of rotary cutting means for paper, card, and the like
US3196724A (en) * 1962-10-01 1965-07-27 Avisun Corp Shear type cutter
US3261249A (en) * 1963-10-14 1966-07-19 Battle Creek Packaging Machine Web cutting assembly with rotating cutting blade

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582522A (en) * 1947-08-15 1952-01-15 Masson Scott & Company Ltd Mounting of rotary cutting means for paper, card, and the like
US3196724A (en) * 1962-10-01 1965-07-27 Avisun Corp Shear type cutter
US3261249A (en) * 1963-10-14 1966-07-19 Battle Creek Packaging Machine Web cutting assembly with rotating cutting blade

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100276834A1 (en) * 2007-09-17 2010-11-04 Jochen Scheurich Device for granulating plastic strands
US8721317B2 (en) * 2007-09-17 2014-05-13 Automatik Plastics Machinery Gmbh Device for granulating plastic strands

Also Published As

Publication number Publication date
DE2219784A1 (en) 1973-10-31
DE2219784C3 (en) 1975-09-04
DE2219784B2 (en) 1975-01-16
GB1382776A (en) 1975-02-05

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