EP0736378B1 - Method and device for separating a screen on a flat screen textile printing machine - Google Patents

Method and device for separating a screen on a flat screen textile printing machine Download PDF

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Publication number
EP0736378B1
EP0736378B1 EP95116618A EP95116618A EP0736378B1 EP 0736378 B1 EP0736378 B1 EP 0736378B1 EP 95116618 A EP95116618 A EP 95116618A EP 95116618 A EP95116618 A EP 95116618A EP 0736378 B1 EP0736378 B1 EP 0736378B1
Authority
EP
European Patent Office
Prior art keywords
screen
squeegeeing
fabric
screen frame
squeegees
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
EP95116618A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0736378A1 (en
Inventor
Shiro Ichinose
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.)
Toshin Kogyo Co Ltd
Original Assignee
Toshin Kogyo Co Ltd
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 Toshin Kogyo Co Ltd filed Critical Toshin Kogyo Co Ltd
Publication of EP0736378A1 publication Critical patent/EP0736378A1/en
Application granted granted Critical
Publication of EP0736378B1 publication Critical patent/EP0736378B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0831—Machines for printing webs
    • B41F15/0845—Machines for printing webs with flat screens
    • B41F15/085—Machines for printing webs with flat screens with a stationary screen and a moving squeegee

Definitions

  • the present invention relates to a method and a device for separating a screen from the fabric on a flat screen textile printing machine.
  • a color paste is forced through a screen with a squeegee onto the surface of the fabric to be printed on.
  • the squeegee must be pressed against the screen so as to slightly bend the forward end of squeegee.
  • the screen After squeegeeing, the screen remains in a sticky state on the surface of the fabric because of the viscousness of the color paste. Consequently it becomes necessary to peel off the screen from the fabric before subsequent squeegeeing.
  • the screen has been separated from the fabric by the following method.
  • the screen After squeegeeing, the screen is separated from the fabric by its rise in an inclined position, more specifically by: a) alternately raising the forward end and the rear end of the screen, piecemeal with a time interval, b) raising only one end of the screen, or c) raising one end of the screen at the side of completion of squeegeeing after lift of the squeegee at said side and, after a time interval, the other end.
  • the reason for raising the screen to bring it in an inclined position is to prevent the screen from flipping against the viscosity of color paste by the separation of the screen. If the screen flips, the residual color paste on the screen meshes would be scattered around over the surface of the fabric. The printed textile soiled with the scattered color paste is treated as a defective product.
  • the screen should be slowly raised into an inclined position to achieve a satisfactory result according to conventional methods. In this case, the operating rate in a printing cycle is unavoidably much lowered.
  • the separation of screen is conducted at a specific speed for the priority to efficiency despite the production of defective products.
  • the screen has been moved upward and downward by a printing unit comprising an assembly of a screen stretched over a screen frame, a support for the screen frame, a squeegee(s), a squeegee carrier, a motor for the travel of squeegee, a transmission mechanism for the transmission of the motion from the motor, guide rails for the travel of the squeegee, etc., the printing unit being adapted to ascend and descend.
  • the printing unit of the prior art is relatively heavy and has a complicated structure. Moreover, a large-scale device of sophisticated structure is required for the ascent and descent of the printing unit.
  • a method of separating a screen from the material to be printed on a flat screen textile printing machine is known from FR-A-2,365,438.
  • the machine is such that when squeegeeing a color paste with squeegees, the screen frame is raised at the side of start of squeegeeing simultaneously with the start of squeegeeing, whereby the screen is separated from the material.
  • the device according to FR-A-2,365,438 comprises at least one flat screen, an upwardly and downwardly movable screen frame having the screen stretched thereover wherein the screen frame is ascendable and descendable by means at the forward and backward ends of the screen frame and at least one of the forward and backward ends of the screen frame is connected to said means so that the end of the screen frame is turnable around an axis orthogonal to the direction of squeegee travel.
  • the feature outline above serves to overcome the problem of elasticity and of geometric printing inaccuracies arising therefrom.
  • a flat screen textile printing machine is known from US-A-4,094,242, the machine comprising an endless belt extending under the screen for transporting the material to be printed on, a roller having a head portion of the endless belt reeved therearound, and a roller having a tail portion of the endless belt reeved therearound, at least on of the rollers being driven. Furthermore, this reference deals with the problem of the undesirable phenomenon of scattering of printing paste or ink, when separating the screen at the completion of the printing operation.
  • the solution consists in restricting the contact of the screen with the material to be printed to the region gripped between the squeegee member and a receiving roller (moved vertically by means of a lifting device) in order to allow a high speed for separating the screen after printing.
  • An object of the present invention is to provide a method and a device for separating a screen from the fabric in the operation of a flat screen textile printing machine without lowering the operating rate in a printing cycle to achieve a satisfactory result. Furthermore, the invention is to enable raising and lowering a screen by small-scale, simplified means for ascending and descending the screen.
  • a method of separating a screen from the fabric on a flat screen textile printing machine comprising: at least one flat screen; an upwardly and downwardly movable screen frame having the screen stretched thereover; an endless belt extending under the screen for transporting the fabric to be printed on; a roller having a starting end or head portion of the endless belt reeved therearound; and a roller having a rear end or tail portion of the endless belt reeved therearound, at least one of the rollers being driven; and pairs of squeegees arranged in the forward and backward directions of the screen, the pairs of squeegees being moved together and squeegeeing being alternately accomplished, wherein while squeegeeing a color paste with squeegees, the screen frame is raised at the side of start of squeegeeing simultanously with, or slightly later than, the start of squeegeeing with each of the pairs of s
  • the invention provides a device for separating a screen from the fabric on a flat screen textile printing machine which achieves the above objects.
  • Said device comprises: at least one flat screen; an upwardly and downwardly movable screen frame having the screen stretched thereover; an endless belt extending under the screen for transporting the fabric to be printed on; a roller having a starting end or head portion of the endless belt reeved therearound; and a roller having a rear end or tail portion of the endless belt reeved therearound, at least one of the rollers being driven; and pairs of squeegees arranged in the forward and backward directions of the screen frame wherein means for ascending and descending the screen frame being arranged in the corresponding positions at the forward and backward ends of the screen frame, the means having a vertically movable member which is driven by said means and wherein the forward end of the screen frame is connected to the member on the corresponding side and the backward end of the screen frame is connected to the member on the other side, both by a pin extending
  • the illustrated embodiment of the invention is an automatic flat screen textile printing machine.
  • a flat screen textile printing machine 1 has the same structure as conventional flat screen textile printing machines except for means for raising and lowering a screen to be described later.
  • the screen textile printing machine 1 is schematically shown as a whole in FIGS. 1 and 2.
  • indicated at 2 is a roller for driving an endless belt 4 for transporting the fabric to be printed on 7; at 3, a driven roller; at 5, a motor for intermittently moving the endless belt 4; and at 6, a printing table.
  • the screen textile printing machine 1 has printing units 11 arranged side by side with a predetermined spacing on a screen textile printing machine frame 10. The details of the printing unit 11 are illustrated in FIG. 3 (plan view).
  • Means 9 for raising and lowering the screen in the printing unit 11 has a structure as stated below.
  • FIGS. 4 and 5 The details of the means 9 are shown in FIGS. 4 and 5.
  • An assembly 118 having a screen 118b stretched over a screen frame 118a is connected via the screen frame 118a to a pair of support bars 117, 117 extending widthwise of the belt 4, the bars 117, 117 being arranged side by side in parallel lengthwise of the belt 4.
  • brackets 115 are attached to both ends of squeegee guide rails 109, 109 extending in parallel with the support bars 117, 117.
  • the support bars 117, 117 are supported at their ends by the brackets 115 via the means 9 serving as a joint.
  • the means 9 includes an upwardly and downwardly movable shaft 901, an actuator 903, such as an air cylinder, joined to the shaft 901 by a connector 902, and a vertically movable member 905 linked to a plunger 904 of the actuator 903.
  • the shaft 901 of the means 9 is joined by thread connection to a manually turnable adjusting screw 116 on the bracket 15.
  • the shaft 901 is ascended and descended by the turn of the adjusting screw 116, whereby the assembly 118 is raised and lowered by the support bars 117, 117.
  • a gap s between a carrier portion of the belt 4 and the screen 118b opposed to the carrier portion can be adjusted by the ascent or descent of the assembly 118.
  • the shaft 901 is fitted in the vertically movable member 905 therethrough. More specifically, the shaft 901 is fitted in a bore formed in the member 905 by way of so-called clearance fit.
  • the member 905 is ascended and descended by the plunger 904 of the actuator 903, whereby the assembly 118, namely the screen 118b, is ascended and descended, relative to the fabric 7 over the belt 4.
  • Crevice-like arms 117a, 117a extending toward the brackets 115, 115 from the ends of the support bars 117, 117 are fixed to the member 905 by a pin 906 extending in a direction orthogonal to the squeegeeing direction of a squeegee 114.
  • the pin 906 is inserted by clearance fit in bores formed in the arms 117a, 117a.
  • the screen frame 118a is turnable around an axis orthogonal to the direction of squeegee travel at one side and at the other side in the squeegeeing direction or direction of squeegee travel (direction indicated by an arrow in FIG. 3).
  • the pairs of squeegees 114, 114 arranged in the squeegeeing direction are moved together in the direction indicated by an arrow in FIG. 3.
  • the preceding squeegee is in a position raised or elevated from the screen 118b, namely in a state of non-squeegeeing
  • the following squeegee is brought into contact with the screen 118b to accomplish squeegeeing by pressure.
  • the squeegees 114, 114 are operated for squeegeeing or is made inoperative for non-squeegeeing in a conventional manner. Therefore, their operation or non-operation is not described more specifically.
  • the screen 118b is raised at the side of start of squeegeeing simultaneously with, or slightly later than, the start of squeegeeing in order to achieve the intended purpose.
  • the screen can be moved upward for separation from the fabric in the manner described above.
  • the screen is raised with respect to the fabric for the separation of screen in the following manner.
  • the separation of screen is initiated with a squeegee positioned in close vicinity with one end of the screen frame 118a at the side of start of squeegee travel. Because the squeegee is positioned in close vicinity with one end of the screen frame 118a at the side of start of squeegee travel, the initial separation of screen occurs at a shorter distance from the starting point than by conventional methods with the screen more inclined and accordingly less or not tensioned.
  • the screen frame 118a is raised at its end from the other side than the side of start of squeegeeing until the screen 118b is suspended in the air as a whole together with the screen frame 118a above the fabric.
  • FIGS. 6 (A), (B) show the initial stage of squeegeeing and the intermediate stage of squeegeeing and separation of screen, respectively.
  • FIGS. 7 (A), (B) illustrate the final stage of squeegeeing and the complete separation of screen from the fabric, respectively.
  • the color paste is designated 30 in FIGS. 6 and 7.
  • the squeegeeing depicted in FIGS. 6 and 7 is advanced from the right side to the left side.
  • the squeegeeing progressing from the left side to the right side is imaginable by substantially reversing the views.
  • the assembly of the screen frame and the support member is ascended and descended structurally independently of the other components of the printing unit. Due to this structure, the screen can be easily raised and lowered using a miniaturized actuator in the means for ascending and descending the screen, or in other words, in a simplified and facilitated manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Printing Methods (AREA)
EP95116618A 1995-04-07 1995-10-21 Method and device for separating a screen on a flat screen textile printing machine Expired - Lifetime EP0736378B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP8222595 1995-04-07
JP82225/95 1995-04-07
JP7082225A JPH08276563A (ja) 1995-04-07 1995-04-07 テキスタイルのフラットスクリーン捺染機におけるスクリーンの剥離方法及び剥離装置

Publications (2)

Publication Number Publication Date
EP0736378A1 EP0736378A1 (en) 1996-10-09
EP0736378B1 true EP0736378B1 (en) 1999-12-29

Family

ID=13768475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116618A Expired - Lifetime EP0736378B1 (en) 1995-04-07 1995-10-21 Method and device for separating a screen on a flat screen textile printing machine

Country Status (8)

Country Link
EP (1) EP0736378B1 (zh)
JP (1) JPH08276563A (zh)
KR (1) KR100365850B1 (zh)
CN (1) CN1072108C (zh)
BR (1) BR9504482A (zh)
DE (1) DE69514210T2 (zh)
SG (1) SG63530A1 (zh)
TW (1) TW290601B (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI401560B (zh) 2009-11-24 2013-07-11 Htc Corp 電子裝置
CN102409566A (zh) * 2011-09-06 2012-04-11 珠海建轩服装有限公司 一种平网印花方法
CN102896883A (zh) * 2012-10-25 2013-01-30 张家港市华源染织有限公司 纺织品印染用版框升降装置
CN102896882B (zh) * 2012-10-25 2014-09-24 张家港市华源染织有限公司 一种纺织品印染装置
KR102225466B1 (ko) * 2020-02-10 2021-03-09 (주)카스아이엔씨 자동 날염장치

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5237890A (en) * 1975-09-18 1977-03-24 Akira Ijiri Flat screen printing apparatus
US4094242A (en) * 1976-06-14 1978-06-13 Shiro Ichinose Lifting devices for flat screen printer
SE398076B (sv) * 1976-09-28 1977-12-05 Svecia Silkscreen Maskiner Ab Stenciltryckmaskin
SE416910B (sv) * 1978-01-30 1981-02-16 Svecia Silkscreen Maskiner Ab Stenciltryckmaskin med stort tryckbord
JPS57142366A (en) * 1981-02-27 1982-09-03 Toshin Kogyo Kk Screen frame up-down device for automatic screen printing press
US4858527A (en) * 1987-07-22 1989-08-22 Masanao Ozeki Screen printer with screen length and snap-off angle control
EP0325401A3 (en) * 1988-01-18 1990-05-16 Masanao Oozeki Improved screen printing machine

Also Published As

Publication number Publication date
DE69514210D1 (de) 2000-02-03
EP0736378A1 (en) 1996-10-09
CN1128210A (zh) 1996-08-07
TW290601B (zh) 1996-11-11
JPH08276563A (ja) 1996-10-22
KR100365850B1 (ko) 2003-03-06
DE69514210T2 (de) 2000-05-11
CN1072108C (zh) 2001-10-03
BR9504482A (pt) 1997-09-02
SG63530A1 (en) 1999-03-30
KR960037305A (ko) 1996-11-19

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