EP0154441A1
Expired / Lapsed
EP
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Adhesive supply system
Assignee: Cambio Ragione Sociale british United Shoe Machine
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Filing: 1985-02-19
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Granted: —
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Expires: 2005-02-19
Abstract
Abstract In a thermo-cementing and folding machine which has a suck-back facility, by which at the end of an adhesive-applying operation adhesive supplied through the nozzle (22) is sucked back into the nozzle so as to prevent "drooling", auxiliary suck-back steps are introduced at timed intervals following the primary suck-back operation, through controlled amounts, in order to counter further risk of "drooling" caused by thermal expansion of the adhesive in the nozzle (22). The number of auxiliary suck-back steps is variable according to the adhesive supply rate at the time of termination of the adhesive-applying operation.
Inventors
- 👤 Ewen Rothnie Cameron
- 👤 Robert Yardley
- 👤 Frank Harry Wolloff
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 17:32
CPC Classifications
A; A43; A43D; A43D25/00; A43D25/18; A43D25/183; B; B05; B05C; B05C11/00; B05C11/10; B05C11/1042; B05C5/00; B05C5/001
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
Adhesive supply system for hot melt adhesive, comprising a pump (26), a melt chamber (28) in which adhesive is rendered molten, a nozzle (22) through which molten adhesive is supplied from the melt chamber (28) by means of the pump (26) , and heating means (H3) for maintaining the nozzle (22) at an appropriate temperature for ensuring that the adhesive in the nozzle (22) remains molten not only during an adhesive-applying operation but also between successive such operations, wherein, at the end of an adhesive-applying operation, the molten adhesive in the nozzle (22) is caused to be sucked back thus to avoid drooling of adhesive from the nozzle (22), characterised in that control means (500) is provided whereby further adhesive suck-back takes place through controlled distances which are spaced apart by pre-selected intervals starting at the end of the primary adhesive suck-back operation (510).
Claim 2
Dependent Claim
144 words
Adhesive supply system for hot melt adhesive, comprising a pump (26), a melt chamber (28) in which adhesive is rendered molten, a nozzle (22) through which molten adhesive is supplied from the melt chamber (28) by means of the pump (26) , and heating means (H3) for maintaining the nozzle (22) at an appropriate temperature for ensuring that the adhesive in the nozzle (22) remains molten not only during an adhesive-applying operation but also between successive such operations, wherein, at the end of an adhesive-applying operation, the molten adhesive in the nozzle (22) is caused to be sucked back thus to avoid drooling of adhesive from the nozzle (22), characterised in that control means (500) is provided whereby further adhesive suck-back takes place through controlled distances which are spaced apart by pre-selected intervals starting at the end of the primary adhesive suck-back operation (510).
Claim 3
Dependent Claim
35 words
Adhesive supply system according to claim 1 characterised in that the number of auxiliary suck-back steps is determined according to the rate of delivery of the pump (26) at the end of the adhesive-applying operation.
Claim 4
Dependent Claim
26 words
Adhesive supply system according to either of claims 1 and 2 characterised in that the distances through which auxiliary suck-back takes place as aforesaid are pre-set.
Claim 5
Dependent Claim
31 words
Adhesive supply system according to any one of the preceding claims characterised in that initiation of each successive auxiliary suck-back step is timed from the end of the preceding suck-back step.
Claim 6
Dependent Claim
37 words
Adhesive supply system according to any one cf the preceding claims characterised in that the later ones of the intervals by which the auxiliary suck-back steps are spaced apart are of greater duration than the earlier ones.
Claim 7
Dependent Claim
35 words
Adhesive supply system according to any one cf the preceding claims characterised in that the controlled distances through which takes place as aforesaid in earlier auxiliary suck-back steps are greater than in later such steps.
Claim 8
Dependent Claim
159 words
Adhesive supply system for hot melt adhesive, comprising a reversible pump (26), a melt chamber (28) in which adhesive is rendered molten, a nozzle (22) through which molten adhesive is supplied from the melt chamber (28) by means of the pump (26), and heating means (H3) for maintaining the nozzle (22) at an appropriate temperature for ensuring that the adhesive in the nozzle (22) remains molten not only during an adhesive-applying operation but also between successive such operations, wherein, at the end of an adhesive-applying operation, the pump (26) is operated in reverse direction whereby to cause the molten adhesive in the nozzle (22) to be sucked back thus to avoid drooling of adhesive from the nozzle, characterised in that control means (500) is provided whereby the pump (26) is thus operated in reverse direction through controlled distances.in a succession of auxiliary suck-back steps spaced apart by pre-selected intervals starting at the end of the primary adhesive suck-back operation.
Claim 9
Dependent Claim
159 words
Adhesive supply system for hot melt adhesive, comprising a reversible pump (26), a melt chamber (28) in which adhesive is rendered molten, a nozzle (22) through which molten adhesive is supplied from the melt chamber (28) by means of the pump (26), and heating means (H3) for maintaining the nozzle (22) at an appropriate temperature for ensuring that the adhesive in the nozzle (22) remains molten not only during an adhesive-applying operation but also between successive such operations, wherein, at the end of an adhesive-applying operation, the pump (26) is operated in reverse direction whereby to cause the molten adhesive in the nozzle (22) to be sucked back thus to avoid drooling of adhesive from the nozzle, characterised in that control means (500) is provided whereby the pump (26) is thus operated in reverse direction through controlled distances.in a succession of auxiliary suck-back steps spaced apart by pre-selected intervals starting at the end of the primary adhesive suck-back operation.
Claim 10
Dependent Claim
63 words
Adhesive supply system according to claim 7 characterised in that the pump (26) is driven by an n.c. motor (M) (as herein defined) and the control means (500) comprises a computer control which serves to control the incidence of the operations of the motor (M) in reverse direction and the duration of all such operation using appropriate look-up tables (Figs. 4 and 5).
Claim 11
Dependent Claim
43 words
Adhesive supply system according to claim 8 characterised in that the computer control (500) determines the number of operations of the motor (M) in reverse direction according to the rate of operation of the pump (26) at the end of the adhesive-applying operation.
References Cited (Backward Citations)
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