CN85107665A - The screen printing machine pressure head - Google Patents

Abstract

A kind of screen printing machine pressure head reaches the elongated rails rail of being made and removably be inserted into the wiping knife rest by hard elastic material by the wiping knife rest, and is made up of the profile bar that soft elastic material is made.This special-shaped rod is fastened to the edge of supporting the rail bottom in use.The support pressing plate of making and installing on the wiping knife rest by hard elastic material is used for supporting the support rail.For the printing ink that distributes more equably, pressure head is equipped with initial doctor, alternately descends the structure that this initial doctor has into curve-like and can pivot with the pressure doctor.

Description

The screen printing machine pressure head

The present invention relates to a kind of screen printing machine pressure head, after this pressure head is directed to can silk screen vertically on reciprocatingly slide and comprise a pressure doctor, it laterally is oriented at vertically going up and dropping on the silk screen of silk screen.

The pressure doctor always is fully with soft elastic material and makes, and presents elongated square-section.Silk screen is crossed with given inclination angle in being clamped at support into its guiding along its total length in upper end in this cross section, pressure doctor when operation, so that the printing ink that will be added on the silk screen by the pressure doctor is pressed saturating.

In order to obtain clearly printed article, printing ink is evenly distributed, and the pressure doctor should rest on the silk screen with uniform as far as possible pressure along its total length.Should there be sharp-pointed blade the lower end that the pressure doctor rests on the silk screen, but also should be soft and resilient, so that unlikely damage or too early wearing and tearing.

On the other hand, sagging by pressure doctor how many meetings under the contact pressure effect of cutter holder device that soft elastic material is made, thereby the angle that causes doctor to rest on the silk screen changes.

Above-mentioned pressure doctor still is unsettled.

For making it sagging slight more good more, as then damaging rapidly and/or wearing and tearing by the silk screen that textile is made with the hard elastic material manufacturing.Thereby force people to use woven wire, but woven wire has other shortcomings, and particularly price is high.

Basic goal of the present invention is to make a kind of serigraphy pressure doctor, this pressure doctor can be avoided above-mentioned shortcoming, directly relatively flexibly rest on the fulcrum, relatively harder than the latter again, thereby unlikely sagging too many under the contact pressure effect of cutter holder device.

When the pressure doctor comprises a doctor support that has the elongated support rail of being made by hard elastic material, this support rail removably inserts in this knife rest, and be positioned on this following sword of supporting rail in use and surface and the moulding stick of supporting that rail links to each other by the soft elastic material manufacturing, then can reach purpose of the present invention.

The available different mode of connection on surface realizes that for example bonding or welding is decided on material used in the various situations.

The support rail is preferably compared very thin flat board or is made up of two on the arrangement same intervals dull and stereotyped institutes with its width.

Support the shape of rail in wide relatively scope, to change.Support that rail can present for example U-shaped cross section, moulding stick is inserted between the end points of two parts simultaneously.

In fact the support rail of this relative thin can be exempted has on vertically laterally saggingly at it, because it is made with hard elastic material, for example use the polyester or the steel that are strengthened by glass fibre to make.

Support rail to make with plastics, adopt this moment special fabrication processes will support the edge of the bottom that is positioned at use of rail to be adjusted to relatively soft and will to support that the remainder of rail is adjusted to relatively hard, these two parts that produce in same production process integrally link together mutually.

Also may use different material to make moulding stick, as long as they are soft flexible on the one hand, the corrosion of anti-on the other hand used screen printing ink.Natural or synthetic rubber is particularly useful for making moulding stick.

Support connecting adhesive or welding between rail and the moulding stick to realize, or also can aborning both be done mutually whole the connection as mentioned above.

As support rail to make with fibre-glass reinforced polyester, moulding stick is made by synthetic rubber, then can easily moulding stick be pressed thereon before the final curing of polyester.When solidifying, supporting to produce closely connection between rail and the moulding stick.But method of attachment is not a theme of the present invention.

The cross section of moulding stick of the present invention is rectangle or L shaped or U-shaped.But as the cross section of the rod of moulding stick insert being supported then be shaped between two dull and stereotyped or two parts of rail also can be T shape or E shape.

Last the present invention's suggestion is arranged in the both sides of support rail with two moulding sticks and it is linked to each other with the support rail.Then, after a shaping rod milling is decreased, the pressure doctor can be opposed, use the shaping rod of opposite side.

Though the top pressure doctor that proposes since support the structure of rail be hard elastic so can stop saggingly greatly, they can be slightly crooked along its length.If the pressure doctor has used holder device, provide a plurality of set screw on it along distribution of lengths, do needed distribution so that can realize contact pressure along length, then this is desirable.

Yet, when not providing the possibility of this adjusting in the screen process press, can use the pressure doctor of wherein supporting rail to comprise to be arranged in two flat boards on the same intervals easily.

Yet may use the support rail in U-shaped cross section too, thereby obtain certain reinforcement, prevent sagging.

The invention allows in addition with one or more and further strengthen along the beading that is stretching on the length of supporting rail or its two flat boards.These beadings can present different cross sections, for example triangle, trapezoidal, square, rectangle or garden shape.

Moulding stick fastening of injecting the wiping knife rest is or realizes with screw or with clamping bar or also available air pressure or hydraulic clamp.

And the ball of fastening also available a plurality of distribution of lengths along the wiping knife rest of moulding stick and add that spring pressure realizes in simple mode.

When the pressure head of design band pressure doctor, should observe following some:

The above-mentioned power that is added in the pressure doctor, the shape of moulding wiping cutter head, and the pressure doctor all influences with respect to the inclination angle on the plane of screen fabric and optionally controlling the quantity of ink that the pressure doctor is pressed screen fabric, thereby influence and control are coated in the printing ink on the printing carrier.In order to make the printing ink that is coated with even, so above-mentioned influence factor must in time keep constant as far as possible.

Yet the soft elastic material that unfortunately is used for making moulding doctor head is chemically stable inadequately, thereby mechanically also stable inadequately.Really moulding wiping cutter head absorbs the composition of printing-ink in use, so its thickness and alteration of form thereof, iff being slightly to change.Then, because the shape of moulding wiping cutter head and flexible these change, the inclination angle that beginning has been mixed up has also changed, so the power that is added on the screen fabric by the latter has also changed.

The above-mentioned unstability that the above-mentioned unstability of present available special-shaped wiping cutter head and being used for is made the material of doctor at first causes the situation of each time printing inking all to change, although just variation quite gradually, and with the naked eye can't see.Yet in case print in a large number,, last printing carrier can find out also that with the naked eye certain difference is arranged even comparing with initial printing carrier, particularly like this when having reached the printing ink of using glazing as thin as a wafer when the printing ink that is coated with.

This difference can be patient in some cases, for example, and when single printed matter hangs over different places.

Yet, when needs are combined into large-area advertisement with many parts of individually printing with silk screen print method, this moment, the printing ink that is coated with expanded to another part from a part, may this thing happens promptly a part print printing ink thick and immediate one be only print off one at the end of printing in batch so thinner.These difference can be it should be noted that immediately when being combined into significantly advertisement, and therefore whole printing style will be damaged.

Clearly can change into the moulding wiping cutter head of wearing and tearing new.Yet even because above-mentioned variation also can take place after the first impression and can't predict, general replacement moulding wiping cutter head still too late.In addition, the manufacturing of shaping wiping cutter head needs very accurate, promptly all should present along the cross sectional shape of its whole length and size constant, and the pressure blade that has sharp-pointed mill to cross.The price of this class moulding wiping cutter head thereby high, and, can cause printing to interrupt owing to need to change moulding doctor head, thereby cause spending to increase.

In order to improve the pressure doctor on the one hand at this, the present invention proposes will by the integral body of hard elastic material manufacturing or amalgamation support to template and the pressure doctor links together, this supports to template and is stretching on the whole length of moulding wiping cutter head and support the latter.

In the case, the free-ended end face that supports to template and be arranged to an one member that preferably provides the angle section structure contacts with moulding wiping cutter head.

The present invention also further proposes to support to template and utilizes a plurality of supports to be fastened on its another member to prop up on the frame rail, and this frame rail and doctor support have certain intervals and stretching abreast and from the latter.

Preferably propose each support this moment can be around a rotation, and this direction is parallel with moulding wiping cutter head and leave certain intervals, and provides adjusting device and regulate the gradient of each support with respect to moulding wiping cutter head.Easily, each adjusting device comprises an adjustment screw, and this screw and support and doctor support support mutually, and engagement is advanced in the screw hole in the support.

If finding moulding wiping cutter head when printing does not very harmonize equably along its length, perhaps the printing ink that is coated with owing to other reason changes along moulding wiping cutter head in the horizontal, then will support to template and be subdivided into a plurality of mutual disjunct parts along its length, just can eliminate these scramblings, this mutual disjunct part together support moulding wiping cutter head, and adjustment screw is housed on it.

Supporting to template can be that it supports that rail is meshed according to selecting with the pressure doctor, perhaps a plurality of nearer or nearer apart from moulding stick from clamped position.Support to template and preferably can be parallel to and itself slide adjustably, so as with these means make the pressure doctor spring constant and thereby its pressure characteristic can change arbitrarily.

The present invention further proposes to support to template and can parallel with the working edge of moulding stick and spool the rotating of the spacer segment of being separated by around direction, and provide adjust usefulness and to the adjustment screw of doctor stent support.Because this structure still may firmly clamp the doctor support, in some scope, change formed angles such as moulding stick and screen fabric.

Another the better simply structure that supports to template is made up of the angle-shaped piece that is fitted together with the pressure doctor, this angle-shaped piece is with the contact of one member and support the part of the pressure doctor that is adjacent to its clamped position of supporting rail, and this angle-shaped piece is fastened on the wiping knife rest with another member.The angle-shaped piece of the supporting member by selecting to have regular length might give pressure doctor one specific spring performance here again.

Last the present invention proposes in the wiping knife rest of pressure doctor, parts in being clamped to screen process press reach between the other parts that removably are loaded with the pressure doctor hinge axis are provided, spring assembly is housed on it, so as with clamped support rail pressure on the serigraphy surface.Because this structure just can accurately be adjusted contact pressure by the utmost point.

The print head of above-mentioned form of the present invention can be also in self well-known mode except that the pressure doctor, initial doctor is housed, this doctor is directed to the latter and reciprocatingly slides jointly, and with respect to the pressure doctor silk screen vertically on swing and can drop on the silk screen and can alternately rise with the pressure doctor.

The known initial doctor of this class is used for making the printing-ink that is coated onto on the silk screen evenly to distribute.Initial doctor and pressure doctor have the working edge of straight line in known pressure head.Yet because silk screen middle cardioptosia in the horizontal, known initial doctor must be to pressing down so that make silk screen finally make excellent contact with the straight line working edge substantially.Only in this way printing-ink is evenly distributed by initial doctor is advanced.Because known initial doctor must be shorter than silk screen width, so printing-ink can not be evenly distributed to the edge of silk screen.

Now for improve the initial doctor of this class and thereby make pressure head efficient of the present invention higher, present arc working edge so the present invention further proposes initial doctor, and be arranged to and can in head, rotate around axle by its two ends.This axle laterally is oriented to the head travel direction, and parallel with the pressure doctor.

By rotating around above-mentioned axle, this initial doctor is descended, its arc working edge is dropped on the surface of silk screen, this center in the horizontal, silk screen surface is sagging, meanwhile working edge contacts with the surface of silk screen along its total length, and printing-ink evenly distributes on the whole width of silk screen when advancing with convenient head.The working edge of initial doctor arc can be adapted to the most sagging curvature of frequent generation of silk screen.Because initial advancing of doctor does the guide with the working edge of its archwise curve, added printing ink slides to both sides along the curve-like working edge at the silk screen center, even thereby the lateral edges of silk screen can both realize that the height of printing-ink evenly distributes.

The initial doctor strip-shaped parts of handy bowl line is made.Preferably the two ends of strip-shaped parts provide axle journal, and this axle journal is aimed at mutually and is inserted in the corresponding bearing in the head.The strip-shaped parts that can obtain less or big curvature with this method wherein two axle journals or at least one axle journal is configured in axis direction.Thereby might make initial doctor be fit to different silk screens best.Silk screen will have bigger or less saggingly in the horizontal, and sagging situation is decided on the material and the mesh width thereof of silk screen, and the curvature of initial doctor can adapt with it.

Followingly the present invention is done more complete explanation, wherein with reference to exemplary embodiments and accompanying drawing

Fig. 1 represents the section by the known pressure doctor, and this pressure doctor is placed on the screen fabric, on the printing holder printing carrier is arranged, and figure has done simplification;

The pressure doctor of different structure among Fig. 2 to 11 expression the present invention has single and two individual support rails and different moulding sticks;

Figure 12 represents wiping knife rest of the present invention, has dismountable pressure doctor and clamping bar;

Figure 13 represents the section by another embodiment of the wiping knife rest that air clamper is arranged;

Figure 14 represents the section by each parts that the pressure head of the present invention that supports template is arranged;

Figure 15 represents wherein to support template and add press contacts rotatably about an axis and flexiblely by the section of each parts that the of the present invention one different pressure head that supports template is arranged;

Figure 16 represents the partial view of the pressure head of looking from the direction of the arrow X VI of Figure 15;

Figure 17 represents the section done along the A-A line among Figure 15;

Figure 18 represents the section similar to Figure 17, has the template that supports to that is combined into;

Figure 19 represents by the section of the wiping knife rest that slidably supports to template is arranged;

Figure 20 represents by the section of the wiping knife rest that supports to template that can rotate around the axis is arranged;

Figure 21 represents the section by the wiping knife rest that the fixed support angle is arranged;

Figure 22 represents the section by the wiping knife rest that clamping bar and hinge axis are arranged;

Figure 23 represents the section by the wiping knife rest that hinge axis is arranged;

Figure 24 represents to have the pressure head that cuts open ink knife frame and initial doctor and is positioned at the horizontal projection of parts of the screen process press of pressure head below;

Figure 25 represents the view of arrow XX V direction among Figure 24;

Figure 26 represents the section done along XX VI line among Figure 24; And

Figure 27 represents the section by the wiping knife rest that dismountable pressure doctor and single ball fastener are arranged.

Known pressure doctor (1) shown in Figure 1 is made up of wiping knife rest (2) and moulding wiping cutter head (3), and this moulding wiping cutter head is inserted in the groove in the narrow limit of wiping knife rest.The wiping knife rest is generally made by metal or other hard and durable material, and moulding doctor head is then by soft and resilient material, for example rubber or thermoplastic material are made substantially.

Figure 1 shows that pressure doctor (1) in the operating position, one blade of the free-ended end face of moulding wiping cutter head (3) contacts with the top margin of screen fabric (5), and the plane that is adjusted to screen fabric (5) of moulding wiping cutter head (3) acutangulates herein; The a large amount of printing ink that are coated onto on the screen fabric present with acute angle, and printing ink is layered on the whole screen fabric (5) when pressure doctor (1) slides into the right side (from figure).

The known pressure that remains unchanged is added to from above on the pressure doctor (1), and causes moulding doctor (3) sagging.How much sagging is significantly and with being subjected to intensity of force, shape, size and the material behavior of moulding wiping cutter head and deciding, thereby also cause the inclination angle of screen fabric is reduced simultaneously.This sagging position (3) of moulding wiping cutter head is represented with chain-dotted line in Fig. 1.

When pressure doctor (1) is crossed over the screen fabric motion, printing-ink (4) can be pressed through screen fabric at the place of seeing through at it, be in printing carrier (6) at this and go up constitute printed coating (7), this printing carrier is positioned under the screen fabric, be placed on printing holder (8) above.Cardboard textile, plastic foil etc. all can be used as printing carrier.

What illustrated is the same, moulding wiping cutter head and printing ink contact change in change that chemically reaches the size that physically causes this moulding cutter head and mechanical property thereof, about these changes, sag of chain finally can become widely greatly or diminish.

Moreover above-mentioned change also may cause the length variations of sag of chain along moulding wiping cutter head.

As mentioned above, the scheme that the present invention proposes is that to be inserted in the wiping knife rest be not the moulding wiping cutter head of being made by soft elastic material, but by the made support rail of hard elastic material, this support rail is equipped with the moulding stick of being made by soft elastic material in its lower end.

The different embodiment of this class pressure doctor wherein or singly supports rail (9) or two support rail (11,12) and moulding stick (10) to interconnect in its lower end shown in Fig. 2 to 11.Subscript a ... the equal reference numbers that k is different is used to different embodiment in Fig. 2 to 11.

Fig. 6 has two support rails in each example of 7,10 and 11 embodiment, its advantage is bigger stability to be arranged with anti-bending.Among the embodiment of the moulding stick among Fig. 4 to 7, after working edge wearing and tearing of moulding stick, might be as long as simply the anti-dress of the support rail in its knife rest just can be used the following blade on opposite.

Top at the wiping knife rest shown in Figure 12 to 14 and 27 is inserted in the pressure head, and each knife rest comprises that a profile is approximately the elongate pieces of rectangle, is equipped with on it to support rail or short pressure forming cutter head directly is housed as shown in figure 14 in its lower section.

In wiping knife rest (13a) the shown in Figure 12 groove (14a) in its lower section the support rail (19a) that the hard elastic plastic material is made is housed removably.Utilization realizes fixing along the many clamping bars (18a) of the distribution of lengths of pressure doctor and the rod iron (15a) of interposition, and this clamping bar can pivotally be contained in the hole (16a), and rod iron (15a) and eccentric wheel (17a) wherein are housed.

Figure 13 shows that the wiping knife rest (13b) of accepting groove (14b), be inserted with the support rail of making by steel plate (19b) in the knife rest, be stained with the moulding stick of making by soft rubber (20b) on the side below it.In hole (16b), be placed with once more this moment along its total length and clamping force distributed to the rod iron (15b) of supporting rail.The cam lever (17b) of a plurality of distribution of lengths along the wiping knife rest also can pivotally be contained in this hole.The piston rod of air pressure clamping device (22b) is at the other end of (21b) hinge joint at each cam lever.By angle-shaped piece (23b) this clamping device is fixed on the wiping knife rest (13b).All cam levers (17b) of arranging along the distribution of lengths of wiping knife rest (13b) can randomly be moved by single air clamper (22b).

Pressure doctor (24) shown in Figure 14 comprise by the metal manufacturing and can be inserted in the pressure head (not drawing among the figure) wiping knife rest (25) and by the known rubber manufacturing of pliability and be inserted into moulding wiping cutter head (26) in the wiping cutter saddle trough.This moment, the wiping knife rest was born the function of supporting rail.This point is possible, supports along its total length because the moulding wiping cutter head of being made by soft rubber (26) supports to template (27) in its side opposite with printing-ink by the dihedral made from steel plate.Supporting to template has a bottom member (29) just in time to contact on the following free-ended top of moulding wiping cutter head (26) and thereby support moulding doctor head.The upper member (28) that supports to template (27) is fastened on the support (30), and this support similarly is fastened on the pressure head.

The form that fastening support rail a kind of simplified in the wiping knife rest as shown in figure 27.The wiping knife rest (13m) that has by the cover plate (82) of screw tightening has a groove (80) can hold the top of supporting rail (19m) in its lower end, and a plurality of holes along its distribution of lengths are arranged, the ball (15m) that compression spring (81) wherein is housed and pressurizes by the latter.A little the hole is shunk at the place, aperture that enters groove (80), this can finish by processing this plain mode with chisel at the edge in hole.Thereby ball can not fall in the groove, but compression spring (15m) with ball portion be pressed into groove (80).The design of size should make when ball is compressed into, and ball can will support under the effect of pressure that rail (19m) is retained in the groove.

Wiping knife rest (35) is equipped with firm support rail (25c) in the embodiment of Figure 15 and Figure 16, is inserted with the moulding stick of being made by soft rubber (26c) in its lower section.Supporting rail (25c) to be inserted into wiping knife rest (35) goes up and holds it on the knife rest with fastener (not drawing among the figure).

Wiping knife rest (35) further is equipped with a plurality of supports (33), and it is fastened on the wiping knife rest (35) with two trip bolts (34) along the distribution of lengths of knife rest and each.Each support (33) all has a transverse holes (no reference number) at its following free end, the parallel longitudinal of its orientation and wiping knife rest (35).The load bearing component (38) of bearing bolt (36) is housed in this hole, and this bolt has threaded parts (37) at its other end.These threaded parts (37) are engaged in the interior screw hole of support (30C) bearing bolt (36) securely.Each support along the distribution of lengths of wiping knife rest (30C) is screwed to dihedral with two screws (31) and supports on the template (27C), promptly is screwed on the latter's the upper member (28c), and its lower member (29c) then contacts and support moulding stick (26C).Thereby on the multiple spot that supports on the length of template, supporting to template (27c) by this class support (30c), each support (30c) can pivotally be connected on the wiping knife rest (35) via bearing bolt (36) and support (33).

Yet, support to template (27c) and be subjected to being screwed in the restriction of the adjusting screw(rod) (32) in the support (30c) to freely the pivoting property of a side of each single support (30c) with respect to wiping knife rest (35), to freely the pivoting property of opposite side then owing to the member that supports to template (27c) (29c) contact pressure forming rod (26c) is restricted.When adjusting screw(rod) (32) be screwed into when dark more thereby may make single support (30c) and thereby make to support in template (27c) inhour (at Figure 15) and sway, and thereby change the flexibility of this moulding wiping cutter head by the variation of support force, this bending is added at moulding stick (26c) when operation that the back produces on the screen fabric.If particularly moulding stick (26c) is along the not very calibration equably of its length, if or owing to arbitrary other reason ink coating from this head of moulding stick (26c) to that cross directional variations then this kind difference can eliminate by the single adjusting screw(rod) (32c) of regulating support (30c) by different way.

Make by relatively thinner steel plate because support to template (27c), then utilize adjusting screw(rod) can realize supporting to the slight bending of template arbitrarily along its length iff relating to slight bending.

Figure 17 shows that to support to template (27c) and lower member (29c) thereof that this supports to template (27c) and rests moulding stick (26c) and go up and support this rod.

Yet owing to be angular structure, supporting to template can not have bigger distortion.If realize bigger bending, support to template and adopt amalgamation structure as shown in figure 18 very convenient, this plate is made by a plurality of short parts (27d).The lower member of these single parts (29d) is contact moudling rod (26d) side by side.Single then each upper member that supports to template (27d) is fastened on the single support, and this support can be regulated independently of each other by its adjusting screw(rod) (not drawing among the figure).

Have been found that and adopt this class support device structure, can actually realize ink coating, and this is that some print job is needed along the given variation requirement on the length of moulding stick.

The useful life longevity of comparing such pressure doctor with the known pressure doctor greatly prolongs, even and in fact can not produce uncontrolled variation after a large amount of printing operations.The result is shown in test, and the printing capability of screen process press increases more than 30% approx.

Wiping knife rest (25e) as shown in figure 19 has groove (14e) to have the support rail of being made by steel plate (9e) of making moulding stick (10e) by soft rubber to be inserted in the groove once more in its lower section, be placed with simultaneously rod iron (15e) below once more, and carry out fastening with screw (40).

Wiping knife rest (25e) also have from above-mentioned groove (14e) certain intervals place one continuously from the top through the groove of bottom.Providing this plate of web (not drawing among the figure) at interval along certain that distributes on the length of wiping knife rest (25e) by above-mentioned groove and remain in the part of the wiping knife rest (25e) on the groove left side.The upper member (27e) that dihedral supports to template is arranged in this groove slidably, and its lower member then contacts with supporting rail (9e).In groove, slidably support the upper member of template (27e) to provide band tooth system (41), rotatably be contained in the groove of wiping knife rest (25e) with its pinion (42) together.Lever (44) can make this pinion rotation, supports template (27e) motion downward or upward reliably on the direction of arrow (43) so that also make.The drift " 1 " of supporting rail (9e) can be changed within the specific limits with this device, thereby spring performance can be changed arbitrarily.

Clearly, in order to change the spring performance of supporting rail (9e), must carry out equably along total length the adjustment that supports to template.Thereby load onto toothed pinion (42) at the two ends of wiping knife rest (25e) at least, and guarantee its even motion.Continuous coaxial realization that this can use by for example two toothed pinions.

Wiping knife rest (25f) has groove (14f) once more in its lower section in the embodiment shown in Figure 20, is used for adorning the support rail of being made by steel plate (9f), and the moulding stick (10f) by the soft rubber making is housed below this supports rail.The rod iron (15f) that available screw (40f) is tightened is placed in the groove once more.

The wiping knife rest has the ledge (45) of a slyness as the centre support that supports pressing plate (27f) at its lower-left end in Figure 20.This supports to template and becomes dihedral and its lower member (29f) to be pressed on the support rail (9f) in its lower section.

Screw (46) is screwed in the above-mentioned ledge and by bigger a little the hole in the upper member that supports to template (27f) and is extending.Can pivot to a certain extent with this support pressing plate after this mode.

Gripper shoe (47) is used for strengthening and supports to the end of template (27f), and is placed on the upper-part that supports to template, and is pushed down by screw (46) equally.The end of adjustment screw (32f) contacts with the proximal surface of wiping knife rest (25f), by the upper end that supports to template and gripper shoe the adjustment screw engagement is arranged.When with this adjustment screw screwin, support to template (27f) counter-clockwise direction and pivot, thereby make the counter-clockwise direction bending similarly of support rail (9f).

It is shown in Figure 21 for the wiping knife rest (25g) of holding tank (14g) and trip bolt (40g) is arranged.Herein once more, its bottom of support rail (9 ' g) of being made by hard plastics is stained with the moulding stick of being made by soft elastic plastic material (10 ' g) and inserts with rod iron (15g) insert.Being screwed to continuous support angle-shaped piece (48) below the wiping knife rest (25g) with screw (49) contact closely and supports rail (a 9 ' g) side and thereby with its free downward protruding member support support rail (9 ' g).Wiping knife rest shown in Figure 22 is by being clamped at the upper-part (25h) in the pressure head and being formed with the lower member (50) that hinge axis (51) connects the latter, and groove (14h) arranged once more in its lower section in order to hold the support rail of being made by hard plastics (9h).Herein once more, rod iron (15h) is inserted in the hole (16h), clamps to be realized by clamping bar (18h), and the structure of clamping bar is for being eccentric (17h) in the contiguous part of locating of itself and hinge axis.With the fastening leaf spring (53) of the screw (54) in the upper-part (25h) of doctor its down the free end lower member (50) that is pressed in doctor go up and when upper-part (25h) is clamped, can make lower member (50) and thereby support rail (9h) is pivoted to the right.

Shown in Figure 23 is another embodiment of double-block type wiping knife rest, and the two halves of this wiping knife rest (25i) and (50i) connect with hinge axis (51i) mutually and can pivot.The first half (25i) plans to be used for playing clamping action in the pressure head of screen process press, and has blind hole (55) that spirality is compressed the spring insertion wherein.When the wiping knife rest is very long, can provide two or more this that hole of spirality compression spring is arranged easily.

The latter half of doctor (50i) is the dihedral contour structure.And by screw (40i) the support rail of being made by hard plastics (9i) is housed, the moulding stick of being made by soft elastic plastic material (10i) is housed below this support rail.

The lower end of spirality compression spring (56) is pressed on the top margin of the latter half (50i) of wiping knife rest thereby the latter is pivoted with support rail (9i) counter-clockwise direction.

As beginning had illustrated, the pressure head shown in Figure 24 to 26 not only comprised the actual pressure doctor, and is included in the initial doctor of latter front.Pressure head is designed to or initial doctor or alternately following to silk screen, the meanwhile other doctor rise of pressure doctor.This technology is well-known, and initial doctor is used for making before printing the printing ink that is coated onto on the silk screen to be evenly distributed on the silk screen as far as possible.In order to illustrate progress of the present invention clearer, what not only illustrate pressure head of the present invention in Figure 24 to 26 further develops but also illustrates the silk screen that is positioned at below the pressure head.

The silk screen of this screen process press (61) is in the drawings only with two tracks that extending in the silk screen part in the vertical (64), (65) expression, this silk screen can be by silk, and nylon or V2A steel wire are made or made by polyester that different mesh counts are arranged or bronze wire when cloth print.Longitudinal edge at silk screen has intensifier (62), when silk screen this intensifier when vertically being clamped is clamped equally.Silk screen central area in the horizontal has sagging slightly, and sag of chain is relevant with different material behaviors.

Track (64,65) is extending on it is vertical outside the silk screen (61), and has pressure head to arrange thereon slidably.Pressure head comprises two balladeur trains (66 that are directed in orbit, 67), stretching between two balladeur trains and in order to be pressed in that silk screen (61) is gone up and the pressure doctor (70) that can descend and silk screen vertically on the initial doctor (71) or (71 ") of waving with respect to the pressure doctor.The two ends of pressure doctor (70) and initial doctor (71) are all supported by the fixed part (68,69) that is contained on the balladeur train (66,67).Fixed part (68,69) includes mechanism and is used for making pressure doctor (70) to descend going up and then make its rising so that be pressed in silk screen (61).The fixed part (68,69) of initial doctor (71) includes same mechanism.The cooperation of two mechanisms is that initial doctor rises when the pressure doctor descends.Mechanism rises pressure doctor (70) automatically when initial doctor (71) descends.

In the exemplary embodiments shown in the figure, initial doctor (71) is made by the strip-shaped parts that bowl line is arranged.Curvature is represented with solid line in Figure 24.Yet (, the curve of strip-shaped parts also can be reciprocal arc as being used among Figure 24 (shown in the chain-dotted line that 71 ") are located.）

The two ends of strip-shaped parts have axle journal (72,73).These axle journals rotatably are contained on the fixed part (68,69).Axle journal (73) can not move in the fixed part than the situation shown in the figure with fixed stop dish (77) thereby axle journal again.

On the contrary, have male thread on the axle journal (72) in the zone between the end of strip-shaped parts and fixed part, be screwed with nut (75,76) above.When at the nut on the threaded area of axle journal (72) when turn on the end of strip-shaped parts, axle journal (72) slides to other axle journal (72) and skids off fixed part (69).Just can adjust the predetermined curvature of strip-shaped parts by the slip axle journal.The curvature of adjusting is fixing by tightening two nuts (75) and (76).The free end of the axle journal that is provided (72) and handle (74) be rotation together integrally.Can make of the axis rotation of whole initial doctor by handle around two axle journals (72,73).Thereby the zone that becomes curve on the initial doctor drops on the silk screen shown in the chain-dotted line of locating in (71 ') among Figure 26.This just causes the working edge of initial doctor and sagging silk screen surface to adapt.

When printing-ink is added to the silk screen center, and initial doctor is dropping to needed position shown in arrow among Figure 26 (78) time after pivoting, pressure head travels forward with the direction of arrow X, and added printing ink just arrives the front of the inclination placement surface of initial doctor (71 ').When pressure head further moved on the direction of arrow X, originally the printing-ink that only occurs at the center just outwards moved along the work edge of initial doctor, promptly to the motion of the two edges of band.Printing-ink is distributed on the whole width of band (61) in this way when pressure head travels forward.By corresponding mechanism initial doctor (71 ') is risen in this operation back with the direction of arrow (78), pressure doctor (70) descends with the direction of arrow (79) simultaneously.Holder to be printed then moves upward near silk screen, and pressure head is with the direction motion of arrow X ' simultaneously, and the pressure doctor (70) of Xia Jianging is pressed onto printing ink on the holder by silk screen simultaneously.

When printing process was finished, pressure doctor (70) rose with the direction of arrow (79) again, and initial doctor (71 ') then drops on the sagging silk screen (61) in its center this moment.When pressure head returned with the direction of arrow X, printing-ink evenly distributed on the whole width of silk screen (61) once more, thereby after mechanism's counter motion, begins new printing process, and promptly pressure doctor (70) descends and initial doctor (71 ') rising.

(mode that the chain-dotted line of 71 ") is indicated, then motion should correspondingly realize conversely if the curve of initial doctor becomes among Figure 24 to indicate.

Claims (32)

1, a kind of screen printing machine pressure head, silk screen vertically on be directed reciprocatingly sliding, and comprise a pressure doctor, this pressure doctor is oriented to vertically going up of silk screen in the horizontal and can drops on the silk screen, it is characterized in that the pressure doctor comprises having the elongated support rail of being made by hard elastic material [9,12] wiping knife rest [13,25].Above-mentioned support rail can removably be inserted in the above-mentioned wiping knife rest, and is made by soft elastic material and to be positioned at this when using and to support edge and the surface below rail and support the moulding stick [10,20,26] that rail links to each other.

2, pressure head as claimed in claim 1 is characterized in that supporting that rail is to compare very thin flat board with its width.

3, pressure head as claimed in claim 1 is characterized in that supporting that rail comprises two flat boards (11,12) of arranging to have common interval.

4, pressure head as claimed in claim 1 is characterized in that supporting rail to present the U-shaped cross section, and moulding stick (10e) is inserted into the end of two member (11e, 12e) simultaneously.

5, it is characterized in that supporting rail or two plate or member to present one or more beadings as the described pressure head of claim 1 to 4 along its length location.(Fig. 8 to 11).

6,, it is characterized in that moulding stick (10a, g, h, i) has the square-section as the described pressure head of claim 1 to 5.

7,, it is characterized in that moulding stick (10b) presents L shaped cross section as the described pressure head of claim 1 to 5.

8,, it is characterized in that moulding stick (10d) has the U-shaped cross section as the described pressure head of claim 1 to 5.

9,, it is characterized in that moulding stick (10e, 10k) has T section as the described pressure head of claim 1 to 5.

10,, it is characterized in that moulding stick (10f) has the E tee section as the described pressure head of claim 1 to 5.

11, as the described pressure head of claim 1 to 5, it is characterized in that two moulding sticks (10C, 10C ') be arranged in the both sides of supporting rail (9C) and with support that rail links to each other.

12,, it is characterized in that supporting rail to make by fibre-glass reinforced polyester as the described pressure head of claim 1 to 11.

13,, it is characterized in that supporting rail to make by steel plate as the described pressure head of claim 1 to 11.

14,, it is characterized in that moulding stick is by natural or synthetic rubber is made as the described pressure head of claim 1 to 13.

15,, it is characterized in that supporting rail and moulding stick to make by polyvinyl chloride fully, and the shear blade that forms the support rail of moulding stick partly present higher plasticizer loading than the support of moulding stick as the described pressure head of claim 1 to 5.

16,, it is characterized in that the fastening of support rail (9,19) of inserting realized by screw (40) in wiping knife rest (25,50) as the described pressure head of claim 1 to 15.

17,, it is characterized in that the fastening of the support rail (19a, 9 ' h) that is inserted into by clamping bar (17a, 18a as the described pressure head of claim 1 to 15 ₃17h, 18h) realize.

18, as the described pressure head of claim 1 to 15, it is characterized in that the support rail (19m) that is inserted into fastening by a plurality of along wiping knife rest (13m, the ball of distribution of lengths 82) (15m) is realized, this ball is arranged in the hole of a sidewall that holds the groove (80) of supporting rail (19m), each ball also partly protrudes in the groove (80) under the effect of compression spring (81), and shrink and prevent that ball from dropping out at the aperture place of hole in entering groove simultaneously.

19,, it is characterized in that the fastening of support rail (19b) that is inserted into realized by pneumatic or hydraulic clamp (17b, 22b) as the described pressure head of claim 1 to 15.

20, as the described pressure head of claim 1 to 15, it is characterized in that with one of making by hard elastic material of interrelating of pressure doctor (24) or amalgamation support to that template (27) contacts and support to template ink knife head (26) from the side and along stretching on the latter's the total length.

21, pressure head as claimed in claim 20, it is characterized in that supporting to template (27) is that angle section structure and the free-ended end face that is arranged to an one member (29) contact with moulding wiping cutter head (26).

22, pressure head as claimed in claim 21, it is characterized in that supporting to template (27) and utilize a plurality of supports (30C) to be fastened on the wiping knife rest (35) by its other member (28), this frame rail is parallel to be supported rail (25C) and with the latter one spacer segment is arranged.

23, pressure head as claimed in claim 22, it is characterized in that each support (30C) can center on a rotation, this axle is and a be separated by spacer segment parallel with moulding wiping cutter head (26C) on direction, and provides adjusting device to adjust the gradient of each support (30C) with respect to the wiping knife rest.

24, pressure head as claimed in claim 23 is characterized in that each adjusting device comprises an adjustment screw (32), and the screw hole in the support is advanced in this screw together support support (30C) and wiping knife rest (35) and engagement.

25, as the described pressure head of claim 20 to 24, it is characterized in that supporting to template (27d) and be subdivided into a plurality of mutually discrete parts along its length, this part together support moulding wiping cutter head (26d) also has adjustment screw and this part interrelates.

26,, it is characterized in that supporting to template (27e) and can be parallel to and itself slide and can regulate as the described pressure head of claim 20 to 25.

27, pressure head as claimed in claim 26, it is characterized in that supporting to template (27f) can be around a rotation, this direction is parallel to the work edge of moulding stick (10 ' f) and the spacer segment of being separated by, and provides the adjustment screw (32f) that the work that is supported on the wiping knife rest (25f) is regulated usefulness.

28, as the described pressure head of claim 20 to 24, it is characterized in that the angle-shaped piece (48) that links with the pressure doctor, the contact of one member is adjacent to and will supports rail to be clamped to the part of pressure doctor of the latter's clamped position with supporting, and is fastened on the wiping knife rest (25g) with other member.

29,, it is characterized in that the wiping knife rest is by pivoting mutually and connecting two parts (25h by hinge axis (51,51i) as the described pressure head of claim 20 to 28,50h, 25i, 50i) form, a spring assembly is coupled and with clamped support rail (9 ' h; 9i) is pressed in the serigraphy surface.

30, as the described pressure head of claim 1 to 29, except that doctor is housed, also be equipped with on the pressure head with doctor and be directed the initial doctor doing to reciprocatingly slide jointly, initial doctor waves and alternately can drop on the silk screen and can rise with the pressure doctor with respect to the pressure doctor on vertically at silk screen, it is characterized in that initial doctor (71,71 ") present arc work edge and be arranged at can be around the axis rotation by its two ends in the pressure head (66; 67); this axis is oriented to pressure head (66,67) travel direction in the horizontal and is parallel to pressure doctor (70).

31, pressure head as claimed in claim 30 is characterized in that (71,71 ") are formed by the strip-shaped parts of an archwise curve initial doctor.

32, pressure head as claimed in claim 31 is characterized in that strip-shaped parts is equipped with mutual straight axle journal (72,73) at its two ends, and this axle journal reciprocally can be regulated on axis direction and can slide to regulate predetermined curvature.

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