GB2272661A - Die-cutting apparatus - Google Patents

Die-cutting apparatus Download PDF

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Publication number
GB2272661A
GB2272661A GB9214251A GB9214251A GB2272661A GB 2272661 A GB2272661 A GB 2272661A GB 9214251 A GB9214251 A GB 9214251A GB 9214251 A GB9214251 A GB 9214251A GB 2272661 A GB2272661 A GB 2272661A
Authority
GB
United Kingdom
Prior art keywords
die
cutting
tool
face
body portion
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.)
Granted
Application number
GB9214251A
Other versions
GB2272661B (en
GB9214251D0 (en
Inventor
John Alan Judge
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9214251A priority Critical patent/GB2272661B/en
Publication of GB9214251D0 publication Critical patent/GB9214251D0/en
Publication of GB2272661A publication Critical patent/GB2272661A/en
Application granted granted Critical
Publication of GB2272661B publication Critical patent/GB2272661B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/10—Means for treating work or cutting member to facilitate cutting by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Details Of Cutting Devices (AREA)

Abstract

Die-cutting apparatus 1 comprises a fixed tool body 2 with a body portion 3 having a tool support face 3a, and a rocking block 7 which is movable towards and away from the fixed tool body to effect die-cutting. The body portion 3 incorporates heating elements 9 and at least one further heating element 10 may be provided in the rocking block 7. The provision of the heating elements 9 and 10 render the apparatus useful for effecting die-cut operations on sheets of plastics materials. <IMAGE>

Description

SHEET FORMING The present invention relates to apparatus for effecting a forming operation on a sheet of plastics material.
The forming may, for example, be a die-cut, an embossing, a creasing, or like operation on the material. For convenience all such operations are referred to herein as die-cutting, and the term die-cut is to be construed accordingly.
One known construction of die-cutting apparatus comprises a fixed body having a tool support face around the periphery of which is an upstanding flange defining a "well" in which a die-cutting tool may be located. The machine also comprises a block (e.g. a so-called rocking block) on which the material to be die-cut is positioned. The block (carrying material) is moved towards the fixed body to effect the die-cut operation.
A problem can however exist in the die-cutting of plastics sheet which may require heating before a satisfactory die-cutting operation can be effected on the sheet. For example, if a cut is to be formed in the plastics sheet it may be necessary for the latter to be heated otherwise the cut may have a jagged edge.
In the abovedescribed apparatus, the heating of a plastics sheet is generally catered for by providing a removable heater plate (incorporating internal heating elements) in the well. Heat from the heater plate is transferred by conduction to the die-cutting tool.
However this arrangement has two principal disadvantages. Firstly, the heater plate takes up a proportion of the depth of the well so that there is less room for a die-cutting tool to be accommodated.
This means that the depth of the tool (e.g. cutters) needs to be reduced. Secondly, the heater plate is generally of steel whereas the abovementioned tool support face is generally of cast-iron. The steel plate transfers heat to the cast-iron face but their different coefficients of expansion means that the heater plate tends to deform sightly thereby reducing the accuracy of the die-cutting operation.
It is an object of the present invention to obviate or mitigate the abovementioned disadvantages.
According to a first aspect of the present invention there is provided die-cutting apparatus comprising a fixed body with a body portion having a tool support face, and a sheet support block which is moveable toward and away from the tool support face wherein heating means are provided behind said face for effecting heating of the face.
Preferably the heating means comprise at least one heating element are provided internally of the body portion on which the tool support face is provided.
By providing the heating means behind the tool support face the abovedescribed problems associated with the provision of a separate heater plate are avoided. In particular, there is no need to use a die-cutting tool of reduced thickness nor are there problems associated with deformation of a heater plate.
Preferably the sheet support block is also provided with a heating element so that both sides of the plastics sheet are heated during a die-cutting operation.
The tool support face may have an upstanding flange defining a well in which the die-cutting tool may be located.
Plastics sheet materials which may be die-cut using the apparatus of the invention include inter alia polyesters, polypropylenes, and PVPs.
The invention will be further described by way of example only with reference to the accompanying drawings, in which: Fig. 1 is a side view of one embodiment of die-cutting apparatus in accordance with the invention; and Fig. 2 is an alternative view of the apparatus shown in Fig. 1.
The illustrated die-cutting apparatus 1 comprises a fixed body depicted generally as 2 having a body portion 3 with a tool support face 3a. The fixed body 2 encloses various components of the apparatus, e.g. gears.
Provided around tool support face 3a is a bounding flange 4 defining a "well" in which a die-cutting tool 5 including a cutting element 6 (depicted as hexagonal) is mounted. The apparatus further comprises a block 7 on which a sheet of plastics material 8 to be diecut may be supported. Block 7 is pivotally movable towards and away from body portions 3 whereby the sheet 8 may be presented to the cutting tool 6. Block 7 is known in the art as a "rocking block".
In accordance with the invention, the body portion 3 is provided with heating elements 9 each of which is provided in a suitably dimensioned bore drilled in body portion 3. Four such heating elements 9 are shown for block 3 but a greater or lesser number could be used. Additionally, block 7 also incorporates a further heating element 10.
Heating elements 9 and 10 may be resistance heating elements associated with a suitable temperature control provided on the apparatus.
In operation of the apparatus, the heating elements 9 cause the fixed body portion 3 to be heated which in turn transfers heat to the metal cutting tool 6. Thus the cutting edge of tool 6 which contacts one face of the plastics sheet 8 is heated. Similarly the other side of plastics sheet 8 is heated by the rocking block 7 (in turn heated by element 10).
The abovedescribed heating ensures that a "clean" cut is obtained in the plastics sheet.
The illustrated cutting tool 6 could be replaced by an embossing tool or a creasing tool. In the case of the embossing tool the apparatus may be used, for example, in the formation of membrane switches.

Claims (5)

1. Die-cutting apparatus comprising a fixed body with a body portion having a tool support face, and a sheet support block which is moveable towards and away from the tool support face wherein heating means are provided behind said face for effecting heating of the face.
2. Apparatus as claimed in claim 1 wherein the heating means comprise at least one heating element provided internally of the body portion on which the tool support face is provided.
3. Apparatus as claimed in claim 1 or 2 wherein the sheet support block is provided with a heating element.
4. Apparatus as claimed in any one of claims 1 to 3 wherein the tool support face has an upstanding flange defining a well in which a die-cutting tool may be located.
5. Die-cutting apparatus substantially as hereinbefore described with reference to the accompanying drawing.
GB9214251A 1992-07-04 1992-07-04 Sheet forming Expired - Fee Related GB2272661B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9214251A GB2272661B (en) 1992-07-04 1992-07-04 Sheet forming

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9214251A GB2272661B (en) 1992-07-04 1992-07-04 Sheet forming

Publications (3)

Publication Number Publication Date
GB9214251D0 GB9214251D0 (en) 1992-08-19
GB2272661A true GB2272661A (en) 1994-05-25
GB2272661B GB2272661B (en) 1996-04-17

Family

ID=10718216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9214251A Expired - Fee Related GB2272661B (en) 1992-07-04 1992-07-04 Sheet forming

Country Status (1)

Country Link
GB (1) GB2272661B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288360A (en) * 1993-04-12 1995-10-18 Takata Corp Melt-cutting uncoated air bag ground fabric
GB2299048A (en) * 1995-03-21 1996-09-25 Cairway Ltd Sheet forming apparatus
WO2006007787A1 (en) * 2004-07-16 2006-01-26 Yeqing Deng Pattern-cutting device, manufacture method and mould thereof
WO2006010319A1 (en) * 2004-07-16 2006-02-02 Yeqing Deng Pattern-cutting device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8522680B2 (en) 2008-10-07 2013-09-03 Faye Angevine Apparatus for forming embossed and printed images
US8789461B2 (en) 2011-01-03 2014-07-29 Bai Win Mercantile Corp (H.K.) Ltd. Double-sided paper embossing apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB704949A (en) * 1950-03-20 1954-03-03 Entwistle & Walker Ltd A new or improved embossing press
GB1227640A (en) * 1968-10-07 1971-04-07
GB2145036A (en) * 1983-12-13 1985-03-20 Robert Edwards Embossing apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB704949A (en) * 1950-03-20 1954-03-03 Entwistle & Walker Ltd A new or improved embossing press
GB1227640A (en) * 1968-10-07 1971-04-07
GB2145036A (en) * 1983-12-13 1985-03-20 Robert Edwards Embossing apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288360A (en) * 1993-04-12 1995-10-18 Takata Corp Melt-cutting uncoated air bag ground fabric
GB2299048A (en) * 1995-03-21 1996-09-25 Cairway Ltd Sheet forming apparatus
WO2006007787A1 (en) * 2004-07-16 2006-01-26 Yeqing Deng Pattern-cutting device, manufacture method and mould thereof
WO2006010319A1 (en) * 2004-07-16 2006-02-02 Yeqing Deng Pattern-cutting device

Also Published As

Publication number Publication date
GB2272661B (en) 1996-04-17
GB9214251D0 (en) 1992-08-19

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980704