EP0341228A2 - Siebdruckmaschine - Google Patents

Siebdruckmaschine Download PDF

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Publication number
EP0341228A2
EP0341228A2 EP89850130A EP89850130A EP0341228A2 EP 0341228 A2 EP0341228 A2 EP 0341228A2 EP 89850130 A EP89850130 A EP 89850130A EP 89850130 A EP89850130 A EP 89850130A EP 0341228 A2 EP0341228 A2 EP 0341228A2
Authority
EP
European Patent Office
Prior art keywords
gripper
printing table
stencil
printing
stop
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.)
Withdrawn
Application number
EP89850130A
Other languages
English (en)
French (fr)
Other versions
EP0341228A3 (de
Inventor
Sylve Jack Donald Ericsson
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.)
Svecia Silkscreen Maskiner AB
Original Assignee
Svecia Silkscreen Maskiner AB
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 Svecia Silkscreen Maskiner AB filed Critical Svecia Silkscreen Maskiner AB
Publication of EP0341228A2 publication Critical patent/EP0341228A2/de
Publication of EP0341228A3 publication Critical patent/EP0341228A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/12—Adjusting leading edges, e.g. front stops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0813—Machines for printing sheets with flat screens
    • B41F15/0827—Machines for printing sheets with flat screens with a stationary squeegee and a moving screen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables
    • B41F15/18—Supports for workpieces
    • B41F15/22—Supports for workpieces for single sheets

Definitions

  • the present invention relates to a silk screen printer, and then preferably to a silk screen printer of the kind which comprises a reciprocatingly rotatable, curved printing table, preferably a cylindrical printing table.
  • Silk screen printers of the kind equipped with a flat frame or frame carriage, in which the stencil is held stretched, and a cylindrical printing table are normally adapted to apply print to a hard and inflexible material, or at least to a material which will only bend to a limited extent.
  • Printers belonging to sub-category a) are intended primarily for printing on hard materials.
  • printers belonging to sub-category b it is also possible to print on bendable or flexible material, and even on very thin materials.
  • the present invention relates primarily to silk screen printers that can be referred to sub-category b).
  • gripping in the present context normally refers to an array of two pairs of gripping fingers which are effective in clamping the print material firmly at its leading edge part.
  • the present invention also relates to silk screen prin­ters of the kind which have a flat printing table.
  • a silk screen printer of the kind in which the printing table has the form of a reciprocatingly moveable cylin­drical drum and (although not shown) a horizontal reciprocatingly movable stencil frame or frame carriage, and in which the horizontal reciprocal movement of the stencil frame is guided by the pivoting movement of the drum is known from UK Patent No. 1,467,910.
  • a gripper for holding the sheet of material to receive print hereinafter referred to as the print material, is mounted on the printing table and is caused to move in an arcuate path in response to movement of the drum or the printing table, said arcuate path coinciding with the upper printing surface of the drum.
  • the present invention is a further development of the silk screen printer described and illustrated in the aforesaid UK patent specification.
  • the gripper and the print material gripped thereby, and the stencil frame, are both a technical challenge and a technical problem to provide such conditions that in spite of the large swinging masses concerned and the high kinetic energies in the printing table and frame which must be stopped abruptly, the gripper can be moveably mounted on the printing table (thus not always fixed in relation to the prevailing position of the table) and then to realize that in such cases, solely the gripper need be caused to adopt a predetermined, exact position in relation, inter alia, to the printer chassi, without needing to take into account the stop position of the printing table and the frame (the sten­cil) in relation to the printer chassi.
  • a qualified technical problem is one of realizing that the requisite exac­titude with respect to registration of the gripper in relation to the printer chassi can actually be achieved by causing solely the gripper to stop in an exact regis­tered position and there, in turn, grip print material which has, in turn, been registered precisely in rela­tion to said chassi, whereas the stencil ,stencil frame and table can be allowed actually to stop in any non-­registered position in relation to the chassi and there­with be afforded a longer retardation time and retar­dation path, but upon return movement of the stencil and printing table for printing purposes, the stencil shall first be brought to a registered position in relation to the stationary gripper before commencing the actual printing sequence, with common guided movement between stencil, printing table and print material.
  • Another technicalproblem is one of realizing the possi­bility of constructing the gripper so that it is "loosely" pivotable or flippable in relation to the printing table and, having realized this possibility, of providing means which enable this possibiltiy to be put into practice, such that solely the upper part of the gripper can be readily registered irrespective of the position of the stencil during the gripper registering sequence, and to provide means such that when the grip­per is in gripping engagement with print material which has been brought to a registered position by some other means, the necessary registered coaction can be obtained between gripper, print material and stencil during the whole of the subsequent printing sequence.
  • a further technical problem is one of providing simple means for imparting to the "loose" gripper a movement in a direction away from the regis­tered stop position which conforms to movement of the printing table during the printing sequence, before movement of the gripper is overtaken by the table, so that coaction between the printing table and the gripper need not take place under conditions in which the table is in motion while the gripper remains stationary, but can take place when the gripper is already moving in the direction of the printing table, but at a speed somewhat slower than the speed of the table. This reduces the force of impact and therewith the transference of impact energy.
  • the present invention relates to a silk screen prin­ter, and then particularly to a silk screen printer of the kind which has a curved printing table, preferably a fully cylindrical or part cylindrical printing table, adapted for applying print to print material, and in which a stencil held in a stencil frame is recipro­catingly moveable above the table in response to the rotational movement ofsaid table, and which comprises a squeegee arrangement or a corresponding device which is effective in pressing the stencil against the print material and the printing table and, via relative move­ment between the squeegee arrangement and the stencil, in applying print to the print material located between the table and the stencil, said squeegee arrangement or said device being stationary in relation to the printing table chassi.
  • the printing table coacts with a gripper which grips the leading edge part of the print material, as seen in the direction of movement of the material, at least during part of a printing sequence.
  • the printer is provided with a gripper which is mounted for horizontal pivotal movement on the table and which in one direction extends in the direction of a longitudinal extension or the movement direction of the table, and that when in its registered stop position, the gripper will be stationary in relation to a first stop means provided on the printer chassi, irrespective of the stop position of the printing table subsequent to having passed said stop position with the gripper.
  • the aforesaid stop position can be adjusted, so as to adjust the gripper registering position in a horizontal direction and therewith adjust registeration of the gripper to a desired location in relation to the chassi or some other reference point.
  • the first stop will preferably be stationary in relation to the printer chassi or stand.
  • the printing table and the stencil frame are constructed to be able to pass a position at which the gripper is intended to be in a registered position and therewith leave the gripper for registration in this position, and to pass towards a stop position which need not be a registered position.
  • the first stop means will have the form of a movement damping device, pre­ferably a hydraulic device, located in a clearly defined end position or terminal position.
  • the front material-gripping end of the gripper When the gripper is located in its registered position, the front material-gripping end of the gripper will be slightly raised, so as to be able to reach and coact with the registered print material more readily.
  • the gripper is mounted on the free end of an elongated element which is pivotally mounted at the other end thereof.
  • the elongated element will extend in a direction related to a radius of the curved printing table, such that the free end of the element and the gripper are located on one side of the radius with the pivot attachment of said element located on the other side of the radius.
  • This pivot attachment of the elongated element is preferably spaced from the centre of rotation of the curved printing table.
  • the elongated element is arranged to slope from its pivot attachment in the movement direction of the table when said table, sub­sequent to a printing sequence, returns to a gripper registering position.
  • the elongated element will turn so as to extend in the direction of said radius, thereby raising the gripper proud of the surface of the printing table, and therewith affording the gripper easier access to and improved coaction with the registered print material.
  • the printer will also preferably include means for accelerating the gripper during its initial movement from the stop position, so as to reduce the extent of the transfer of impact energy from the printing table to the gripper.
  • said means will have the form of a forked roller fork arrangement, which is able to function both as a retarding means and as an accelerating means.
  • the dual purpose forked roller arrangement, or means is able to coact with the gripper before said gripper reaches its final, registered stop position, so as to be able to slow the gripper down to zero over a short movement path and also be able to accelerate movement of the gripper from said stop position before movement of the gripper is overtaken by movement of the table and therewith ensure that only small impact forces will occur.
  • Another advantage is that the gripper is accelerated initially, by separate means, from its registered position before the gripper is overtaken by the printing table, so as to reduce the transferrence of impact energy.
  • Figure 1 illustrates part of a silk screen printer 1 having a curved printing table 2 which presents a cylindrical printing surface 2a.
  • the printer is intended to apply print to print material 3.
  • the printer also includes a stencil 4, which is only partially shown, mounted in a stencil frame 5 in a conventional manner.
  • the front edge 3a of the print material 3 is shown to be located adjacent regis­tering devices mounted on respective sides of the print­ing surface 2a of the cylinder or drum. Mounted in the immediate vicinity of the registering devices are hold­ing down devices 6 which are effective in holding the front edge 3a of the thin print material against the printing surface 2a.
  • the illustrated printing table will move to the right, as indicated by an arrow in Figure 1, and the frame 5 with stencil 4 will also move to the right as seen in the Figure.
  • a squeegee arrangement 7 is fixedly mounted in relation to the printer chassi and is shown in a position in which it coacts with the stencil 4 and presses printing paste (not shown) located on the stencil down through the stencil perforations and onto the underlying print material 3.
  • Coacting with the leading or front edge 3a of the print material are two grippers.
  • Each of the grippers is provided with gripping fingers (not shown in Figure 1) which are mounted in the printing surface 2a of the cylindrical printing table.
  • the schematically illustrated sqeegee arrangement 7 is intended to press the stencil 4 against the print material 3 and also against the prin­ting surface 2a in a known manner, and therewith tran­sfer print to the print material 3 located between the printing table and the stencil.
  • the printing table 2a coacts with two grippers which are intended to hold the leading edge 3a of the print material, as seen in its direction of movement, preferably during the whole of a printing sequence, or in any event during at least a part of said sequence.
  • the squee­gee arrangement is arranged to be lowered during a printing sequence, so as to press the stencil against the print material at the uppermost point of the prin­ting surface 2a and to be held in this position as the print material is moved to the right by the gripper.
  • one of the two grippers 8 of the illustrated embodiment is capable of moving horizontally to some extent in an arcuate path along the printing surface 2a of the printing table 2.
  • auxiliary devices may be used to effect horizontal movement of the gripper 8 along part of the printing surface 2a of the printing table.
  • the gripper 8 is arranged to be displaced through a short distance along the printing surface 2a in direc­tion commensurate with a longitudinal extension of the stencil frame or the direction of movement of said frame during a printing sequence.
  • Figure 2 illustrates the print material 3, and par­ticularly the leading edge 3a of said material, located in an exact position of registry in relation to the printer chassi 10.
  • the gripper 8 includes a plurality of anvil surfaces 8b and a plurality of raisable and lowerable fingers 8a which, in the registered position shown in Figure 3, are intended to grip firmly the leading edge part 3a of the print material 3.
  • the stencil Upon movement from the illustrated ( Figure 3) positional settings of the gripper 8, the print material 3, the printing table 2, the stencil 4 and the stencil frame 5, and also upon the return movement of the printing table and stencil effected in order to apply print to the print material, the stencil will move first relative to the gripper 8 and the print material 3 until the gripper 8 engages a second stop means which is formed when the surfaces 14 and 15 are brought into abutment with one another, whereupon the stencil is registered in this position relative to the the gripper 8 and printing can commence, with the gripper 8, the print material 3, the stencil 4 and stencil frame 5 in mutually registered positions.
  • an externally screw threaded pin which is intended to coact with an internally screw threaded sleeve in a manner to effect said adjustment.
  • the pin and sleeve are not shown, for the sake of simplicity.
  • the printing table 2 and the stencil frame 5 can thus be permitted to pass slightly beyond the registered posi­tion of the gripper 8, which will take its registering position relative to the chassi 10, suitably to grip and collect print material 3 which has been registered in an exact position by other means, for a subsequent printing sequence.
  • the registered position of the gripper 8 can be adjusted, by means of the adjustable stop 13. This adjustment will preferably be maintained for a number of printing sequencies.
  • the stencil frame and stencil are moved to and fro in the stencil frame and stencil are moved to and fro in response to the forward and backward movement of the cylindrical printing table, this movement defining the prevailing printing speed.
  • the gripper 8 is mounted so as to be freely pivotable on the printing table and so that when in a printing position or return position is pressed against a stop in the printing table 2, causing the the gripper 8, when moved to the left in Figure 1, to stop against a first stop 13 which is stationary in relation to the printer chassi 10 and to grip print material 3 in this registered position, while allowing the the frame 5 and the printing table 2 to travel further, preferably much further.
  • the gripper 8 will still be located in its registered position, due to the fact that it is freely pivotal.
  • the gripper 8 can be brought to its registered position in relation to the printer chassi 10 by the stop 13 with only a small uptake of energy, irrespective of the relative stop positions of the frame 5 and the printing table 2, when gripping or collecting print material 3.
  • the gripper 8 Before commencement of an actual printing sequence, the gripper 8 is first registered relative to the frame 5 and the stencil 4, through rotary movement of the cylin­drical printing table 2, whereafter the actual printing sequence takes place with the gripper 8, the print material 3, the frame 5 and the stencil 4 in their cor­rect registered relative positions.
  • the movement damping device which functions as the first stop means 13 may be modified to form a well defined terminal position (a first stop) for the gripper 8. In this case the gripper 8 is held against the stop with the aid of the spring force generated by a spring 16.
  • the gripping means 8a and 8b of the gripper 8 are disposed on the outer end of an elongated element 20, which is pivotally mounted at the other end thereof.
  • the elongated element is intended to extend in a direc­tion related to a radius 21 on the curved printing table 2, such that outer end of the element 20 and the gripping means 8a 8b will be located on one side of the radius while the pivotal attachment, referenced 20a, will be located on the opposite side of said radius.
  • the pivot attachment 20a is located at a distance "b" from the centre of rotation 2′of the cylindrical print­ing table 2, this distance being suitably from 15 to 50% of the length of the radius, preferably about 30%.
  • the elongated element 20 is also intended to slope from the pivot attachment 20a at a small angle "a" to the direction of movement of the table 2, when the table returns to and beyond the registered position of the gripper 8, upon completion of a printing sequence.
  • the elongated element 20 When the gripper 8 is located in its registered position against the stop 13 and when the printing table is permitted to pass beyond this position, the elongated element 20 will rotate about its lower pivot attachment 20a such as to extend more in the direction of the radius 21, the angle "a" therewith being decreased. The gripper will therewith be raised above the printing surface 2a of the printing table 2, as particularly shown in Figure 3.
  • Figure 3 shows, in broken lines, the position of the pivot attachment 20a when the gripper 8 abuts the stop 13.
  • Figures 2 and 3 are enlarged views of an auxiliary device 30 which is effective in slowing down movement of the gripper in a direction towards the stop position and /or in accelerating movement of the gripper away from said stop position.
  • this device has the form of a forked roller arrangement.
  • the forked device has tines or legs 31 and 32 which are intended to embrace a pin 33 on the gripper 8, before the gripper 8 reaches its registered stop position.
  • the forked roller arrangement 30 is stationary in relation to the chassi 10 and is rotatable about an axis 34 related to the chassi.
  • the elongated element 20 When the gripper 8 is located in its registered position against the stop 13 and when the printing table is permitted to pass beyond this position, the elongated element 20 will rotate about its lower pivot attachment 20a such as to extend more in the direction of the radius 21, the angle "a" therewith being decreased. The gripper will therewith be raised above the printing surface 2a of the printing table 2, as particularly shown in Figure 3.
  • Figure 3 shows, in broken lines, the position of the pivot attachment 20a when the gripper 8 abuts the stop 13.
  • Figures 2 and 3 are enlarged views of an auxiliary device 30 which is effective in slowing down movement of the gripper in a direction towards the stop position and­/or in accelerating movement of the gripper away from said stop position.
  • this device has the form of a forked roller arrangement.
  • the forked device has tines or legs 31 and 32 which are intended to embrace a pin 33 on the gripper 8, before the gripper 8 reaches its registered stop position.
  • the forked roller arrangement 30 is stationary in relation to the chassi 10 and is rotatable about an axis 34 related to the chassi.
  • Movement of the gripper to the left in the Figure can now be taken up by the forked roller arrangement 30 in a known manner, as a result of the pivoting movement of said arrangement.
  • the gripper is located in this position and is pressed towards this position as a result of the retardation forces acting on the printing table 2.
  • the printing table Upon commencement of a printing sequence, the printing table is accelerated to the right in the Figure while at the same time the forked roller arrangement 30 is activated in the direction of the arrow shown, this movement forcing upon the gripper 8 an initial movement to the right.
EP89850130A 1988-05-02 1989-04-24 Siebdruckmaschine Withdrawn EP0341228A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8801644A SE8801644L (sv) 1988-05-02 1988-05-02 Stenciltryckmaskin
SE8801644 1988-05-02

Publications (2)

Publication Number Publication Date
EP0341228A2 true EP0341228A2 (de) 1989-11-08
EP0341228A3 EP0341228A3 (de) 1990-08-16

Family

ID=20372194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89850130A Withdrawn EP0341228A3 (de) 1988-05-02 1989-04-24 Siebdruckmaschine

Country Status (3)

Country Link
EP (1) EP0341228A3 (de)
JP (1) JPH0211326A (de)
SE (1) SE8801644L (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776100B2 (en) 2001-12-21 2004-08-17 Thomas V. Cutcher Method and apparatus for transferring an image to a substrate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW487770B (en) * 1995-12-15 2002-05-21 Honda Motor Co Ltd Lubricating system in a 4-stroke engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE654716C (de) * 1935-07-28 1937-12-29 Dresden Leipziger Schnellpress Haltzylinderschnellpresse
GB1467910A (en) * 1973-08-13 1977-03-23 Svecia Silkscreen Maskiner Ab Printing machines
EP0289472A2 (de) * 1987-04-15 1988-11-02 Svecia Screen Printing Systems AB Siebdruckmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE654716C (de) * 1935-07-28 1937-12-29 Dresden Leipziger Schnellpress Haltzylinderschnellpresse
GB1467910A (en) * 1973-08-13 1977-03-23 Svecia Silkscreen Maskiner Ab Printing machines
EP0289472A2 (de) * 1987-04-15 1988-11-02 Svecia Screen Printing Systems AB Siebdruckmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776100B2 (en) 2001-12-21 2004-08-17 Thomas V. Cutcher Method and apparatus for transferring an image to a substrate

Also Published As

Publication number Publication date
SE8801644D0 (sv) 1988-05-02
SE8801644L (sv) 1989-11-03
JPH0211326A (ja) 1990-01-16
EP0341228A3 (de) 1990-08-16

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