DE7146630U - Screen printing device - Google Patents

Description

Screen printing device

Slebdruckmaschlnen are used to print z. B. cylindrical, conical, roughly elliptical in cross section or roughly rectangular and flat bodies. These bodies, i.e. the ones to be printed Objects can be divided into two groups with regard to the relative movement sequence during the printing process will. One group includes, in particular, cylindrical, conical and transversely: 'j-tt roughly elliptical bodies, which has in common that a rolling process takes place between the printing stencil and these bodies during the printing process, in the course of which the body executes a rotational movement about its longitudinal axis or an axis parallel to it. In this context it is known to move the printing stencil back and forth, whereby when moving in one direction the transmission of the printing medium on the object to be printed, while the return movement is used to reinsert the printing stencil to bring their starting position for the next printing process. The squeegee assigned to the printing stencil is during the Stationary printing process. It is only provided that during the already mentioned return movement of the printing stencil the squeegee is removed from the printing stencil in its starting position.

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is raised in order to be brought into a position again before the start of the next printing process, in which it is on the printing stencil is applied.

: For the other group of bodies that were printed during printing are not rolled over, the arrangement is such that they are attached to the printing stencil during the printing process.

: lie without any relative movement between the template and the body he follows. The printing ink is applied to the body

by means of the squeegee, which can be moved relative to the printing stencil.

ι In this case, the printing stencil is stationary, while the

ι squeegee executes a back and forth movement, whereby the movement

j gation in one direction to apply the pressure and the loading

; movement in the other direction to return the squeegee in the

Starting position can be used.

Known screen printing machines are therefore often designed so that they have a reciprocating holder and a stationary one Have bracket, the latter firmly connected to the machine frame or part of the same. Moved back and forth on the : Bracket is when printing on objects that have a rolling motion carry out, the printing stencil attached while the stationary holder carries the squeegee. In the other case, that is, at Printing on objects of the second group is the printing stencil carried by the stationary bracket while the squeegee is attached to the reciprocable bracket.

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A disadvantage of these known screen printing machines is that that - since only one of the parts can be moved during the printing process, this has a relatively long stroke has to perform in order to apply a print image with certain dimensions to the object. Furthermore, in general, only a few paragraphs can be used to be worked. As a result, the throughput of the known screen printing machines is comparatively low are.

It is also a screen printing device through US Pat. No. 2,881,699 for printing objects with a roughly square cross-section, e.g. B. bottles, known in which the objects between whose flat boundary surfaces are rounded transitions, are held in carriers during the printing process, the open ones Have extensions whose cross-section corresponds approximately to that of the objects to be printed. The carriers are along a transport path moveable. In the course of the transport of the carriers and the objects they hold, their flat boundary surfaces become brought to rest on a flat printing stencil arranged next to the transport path, one opposite the printing stencil movable squeegee brings the printing ink onto the flat boundary surface of the object. Then it is on the carrier and that of him transferred object held a pivoting movement, in the course of which the transition rounding of the object that now comes into contact with the printing stencil can be printed. At the end of this Pivoting movement lies the following flat boundary surface of the

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at the Printing template - 4th - r - at. These 0 - ·
b> ■
. ·. ata Object known £

direction that the printing of a with flat boundary surfaces
and the intermediate rounding of the object provided over its entire circumference in one work step is extremely complicated in its structure and prone to failure. In addition, the printing of objects of different sizes would be possible

make considerable modifications necessary with each change. !

Furthermore, the DT-AS 1 227 417 provides a screen printing device I

known for printing webs, in which the printing stencil with! of the continuously moving web is moved synchronously during the printing process, in order to then move against the web movement in its | To return to the starting position. The squeegee is transverse to the movement

direction of travel of the web. In particular because of this act- I

It is not possible to adapt the device to different circumstances and requirements, since the doctor blade stroke is always; depends on the width of the print image. Otherwise causes
transversely comparable to the movement of the printing stencil and the object support 'running movement of the doctor blade inevitably a KompIizierung at least the drive causing the parts of the device. Printing on objects that can be rolled over on the printing template is neither
provided still possible.

It is still through the OE-PS 280 200 and through the DT-AS
1 460 787 a screen printing device for printing webs.
knows, in which the web can be moved synchronously with a printing stencil and the squeegee is opposite to the direction of movement of the printing

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stencil and the web can be moved from their rest position over the printing stencil into a rear area of the printing stencil that is impermeable to printing ink. This is intended to ensure that with each print the pattern immediately follows on from the previous print. A substantial acceleration of the actual printing process cannot be achieved because the length of the print image is always dependent on the length of the stroke performed by the printing stencil. It is also true here that printing on objects that can be rolled on the printing template is neither intended nor possible.

The invention is based either on a screen printing device with a carrier for the object to be printed , which can be moved in the same direction with a squeegee, and with a printing stencil or from a screen printing device with a carrier for the object to be printed, which is in the same direction Direction can be moved synchronously with a printing stencil, as well as with a movable squeegee.

It is based, inter alia, on the task of designing such screen printing devices in such a way that acceleration occurs once can be reached during the printing process. On the other hand, the aim is to achieve an in Direction of movement of the printing stencil or squeegee a greater length

j having print image to be able to apply to the object. In addition, there should be the possibility that the objects to be printed are continuously transmitted through the screen printing device.

are portable, although it should not be necessary to do this

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Interrupt the transport process for the printing process. Further The aim is to be able to carry out several printing processes in succession as part of a transport process.

To solve this problem, the invention proposes a screen printing device with a carrier for the object to be printed, which can be moved in the same direction with a squeegee, and with a printing stencil that the printing stencil, which can be moved back and forth with an adjustable stroke, and the squeegee run in the same direction or in opposite directions can be driven with a relative speed to one another and the object carrier for printing can be rolled on the printing stencil Objects is arranged to be reciprocable with a constant stroke.

If the screen printing device with a support for the to be printed Object that can be moved in the same direction synchronously with a printing stencil, as well as provided with a movable squeegee is-t, the arrangement can according to a further proposal of the invention be made in such a way that the printing stencil and the squeegee, which can be moved back and forth with an adjustable stroke, run in the same direction or in opposite directions can be driven with a relative speed to one another and the object carrier for printing objects that cannot be rolled over is arranged to be reciprocable with a constant stroke.

According to a further proposal of the invention, the arrangement can be made such that the slide can be driven and a squeegee or printing template is connected to the slide. To this

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This is a particularly simple design of the device achievable, especially since there is the possibility of simply exchanging the squeegee and printing stencil or the support elements for these two parts of the screen printing device can be used for printing both rollable and non-rollable objects close.

F. Another essential advantage of the invention is - independent it depends on whether objects that can be rolled or not are printed - in the fact that the relative movement between Printing stencil and squeegee the stroke length for a given print image length gets smaller. The adjustability of the stroke speed of the printing stencil or squeegee also gives the possibility of setting the printing speed to the optimum in each case. So are z. B. at the Printing stencils to be rolled hollow bodies with a small diameter are difficult to print at a given speed of the printing stencil as a hollow body with a large diameter. By setting the relative speed of the interacting Parts can be achieved the optimal printing speed. - Furthermore, there is due to the constant stroke of the slide in all cases the possibility of the objects to be printed regardless of their dimensions in a certain place to give up on the slide. The same applies to the point at which the printed objects are removed from the slide will. This facilitates the interaction of the specimen slide with a conveying means assigned to the screen printing device. Another advantage arises when the screen printing

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! device has two more printing stations, which one after the other

I [

someone else apply two or more printed images to each object. In ί In this case, the distance between the individual printing stations'

i _t

can be selected regardless of the respective dimensions of the objects!

j I

ί>

because due to the adjustability of the stroke of the printing stencil ^; or squeegee an adaptation of the larger objects or print image;

; length to the distances between the printing stations without further ado \

!is possible. If the adjustability according to the invention is not met

i i

! would have to change, for example, the diameter j

I!

i and thus the print image length of the objects to be printed on would stand between the pressures of the respective conditions;

\ i

be long-fitting. - Furthermore, there is the mobility of pressure switches |

S!

j blone and squeegee the possibility of these parts with half the amount!

j speed to move or - if the speed is known

ι '

Devices is retained - to achieve higher performance.
; In any case, there is the possibility that printing stencil and
Squeegees are movable relative to one another in the same direction during the printing process. This will be the case when
the length of the print image to be applied to the object in the direction of movement of the printing stencil or squeegee is relatively short
is like B. with cylindrical objects with a small diameter.
But there is also the possibility that printing stencil and
Squeegees are movable in opposite directions during the printing process.
Then the strokes of both parts add up, so that for a given
Hub of one of these parts a print image can be applied that
has a larger dimension in the direction of movement of the parts
than with known screen printing devices.

9 -

An embodiment has proven to be particularly advantageous, at which squeegee and printing stencil one of the movement

Have movement of the slide derived drive, wherein a reciprocating rotary element is interposed. ; A crank drive, whose crank point is adjustable, can be assigned to the rotary element. In this way the in relation Appropriate setting based on the dimensions of the respective objects which determines the reciprocating movements of the rotary element. So a setting can be chosen at which the rotary element during the printing process in the

is movable in the same direction as the slide, but j

the speed of both parts is different and therefore a | Relative movement is given. This arrangement is with the already mentioned application of short printed images in the direction of movement of the parts is expedient. With medium length of the print image or In the case of a medium development length, it may be useful that the Crank point assumes a neutral position. In this case, the rotating element does not experience any displacement. The two can be moved towards each other Parts carry out an equally long stroke in the opposite direction, with the development length or the dimension of the applied print image is equal to the sum of the two strokes. In the case of the already mentioned objects with a large diameter or with a large dimension of the print image in the direction of movement of the parts, it is useful that the rotary element during of the printing process opposite to the direction of movement of the slide is movable. The printing stencil or the squeegee carries out a stroke which is equal to the sum of the two

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times the stroke of the rotary element and the slide is.

The slide can be carried by slides that are attached to parallel to the direction of movement extending rods, rails or the like.

are led. The carriage can at least one across Carry traverse running in the transport direction, on which at least one base plate or an intermediate slide is arranged, on which or which a preferably revolving drive means engages. The carriages can have at least one transverse to the direction of transport Carry running traverse, on which at least one base plate or an intermediate slide is arranged, on the or which is engaged by a preferably rotating drive means. An embodiment has been found to be particularly useful, in which two base plates are present, each of which is provided with a toothing on which a drive pinion or Like. Attacks to the reciprocating movement. These teeth can be designed as internal teeth. The invention continues to see the possibility that the internal toothing is long and round with the two mutually parallel sections in the direction of movement of the Objects is designed to run and both base plates with a long-round guide track corresponding to the internal toothing are provided, with a guide roller engaging in this guide track.

For printing on conical or similar objects, the arrangement be made in such a way that the printing template is in the printing plane on the holder assigned to it and on the slide

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is pivotably mounted such that a longitudinal displacement of the printing stencil relative to the holder or the specimen slide is possible at at least one fastening point. In order to enable easy adjustability with regard to objects of different sizes, it is also expedient to make the fastening point connected to the object carrier adjustable for setting a radius corresponding to the conicity of the object to be printed.

According to a further proposal of the invention, a revolving transport element can be provided in addition to the object carrier, by which the objects to be printed are transported and, after the printing process has ended, the printed objects are transported further. The axes of the guide, steering or drive wheels, rollers or the like of the means of transport can be mounted pivotably with respect to the plane in which the pressure is applied. In this way, it is possible without difficulty to adapt the position of the transport means when printing conical objects to their position. The inclined position of the means of transport will correspond to half the cone angle.

The means of transport, which is preferably designed as a pair of chains, is advantageously designed or arranged in such a way that it can be displaced with respect to the drive, deflection and / or guide wheels or the like, the chains being provided with holders or receiving elements for the objects; the design that enables the displaceability can also be attached to the drive elements or the like.

7Hfifi3n

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be ordered. What is crucial is definitely the possibility exists, the transport company or those borne by him Receiving elements for the objects without difficulty to align to the slide or any other part of the machine.

When the slide with the objects holding centering elements; is provided, which are displaceable relative to one another in the axial direction of the object, they can have a greater distance during the return of the object carrier to its starting position than during the printing process. By the way, you can

I slides and / or centering elements can be adjusted in height

j be net.

Furthermore, the invention provides the possibility that along the j transport means several printing stations are arranged one behind the other, so that when the object passes through several imprints - if necessary with intermediate drying - applied to the object

can be.

In the drawing, an embodiment of the invention is shown in the scheme. Show it:

1 shows the side view of a screen printing machine, FIG. 2 shows the associated top view,

3 shows the front view of a second embodiment, FIG. 4 shows a section IV-IV of FIG. 3,

7U663D2.fi.M7i

• I 11 ■ ·

■ 11 · ·

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Pig. 5 and 6 the position of the z-acting together during the printing process Parts when printing roughly cylindrical objects at the beginning and at the end of the printing process,

7A to C three different settings of the common drive of the two parts that can be moved relative to one another,

8 and 9 representations corresponding to FIGS. 5 and 6 in Printing of flat objects or objects with a roughly rectangular cross-section,

FIG. 10 shows a plan view of a drive of the specimen slide, FIG. 11 shows the associated side view,

12 shows a detail from the front view of the printing device when printing conical objects, 13 is a plan view of a printing stencil for printing

ken of conical objects,

14A and B show the movement diagram of the printing stencil when printing conical objects at the beginning and at the end of the printing process.

The screen printing machine 20 shown in Figures 1-7 of the drawing is continuous with two parallel and synchronous revolving chains 21 which are guided over drive and deflection wheels 22. The two chains 21 run in each other parallel planes around. They are guide strips 23 for the objects to be printed lying in or on receiving elements 24 25 assigned. The distance between the two chains 21 and the guide strips 23 depends on the size, in particular the

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Length of the objects to be printed 25. A printing station 27 is assigned to the two upper strands 26 of the chains. This consists of the essentially comprising a slide 28 that can be moved to and fro, a printing stencil 29 and a squeegee 30.

In the embodiment shown in Figures 1-7 ι
j be printed substantially cylindrical objects 25 which j to the printing stencil 29 are rollably. In this case, the squeegee 30 is connected to the specimen slide 28 in a fixed manner. Last-

rer consists essentially of a base plate 31 which carries two stands 32 and 33. The stand 32 is provided with a centering element 34 which is inserted into the one open end of the object to be printed , which is a bottle.

j protrudes. This spike-like centering element 34 can also! serve in a known manner to introduce compressed air into the bottle during the printing process j. The second centering element 35 is cup-shaped. It serves to take up the soil; of the object 25 and is provided with a shaft 36 which is mounted on the stand 33 and carries a gear 37. The stand 33 is provided near its upper end with a cantilevered arm 38 which carries the doctor blade 30. The object carrier 28 is also provided with a toothed rack 39 which runs parallel to the two chains 21 and thus to the transport direction of the objects 25.

The printing stencil 29 is carried by a carriage 40 which is guided on rods 42 running parallel to the transport direction 41 of the objects 25. The carriage 40 is still with a

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Rack 43 is provided, which is parallel to rack 39 of the slide 28 runs, both racks 39 and 43 are assigned a common gear 44, the axis 45 of which is from a connecting rod: rod 46 is carried, the other end to the crank pin

47 of a crank disk 48 is articulated. The latter is with a guide 49 for the crank pin 47 is provided, which is radially displaceable with respect to the crank disk 48 and in a certain Position can be determined on the diameter of the crank disk 48.

As long as the crank pin 47 is not in the center of the crank disk

48 is arranged is by a rotational movement of the crank disk 47 causes the gear wheel 44 to move back and forth. This movement is transmitted through the connecting rod 46. The gear 44 meshes with the two racks 39 and 43.

In Fig. 4 of the drawing is more cylindrical in connection with the printing Body shown the middle position of the two racks 39 and 43, with the crank pin 47 at the center of the Crank disk 48 is arranged and thus assumes its neutral position. Fig. 5 shows the position of the printing stencil 29 and slides 28 with object 25 before the start of the printing process. Fig. 6 shows the same parts after completion of the printing process.

The slide 28 is provided with an additional drive, which will have to be described separately. This drive

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pushes the slide during the printing process synchronously I with the transport chains 21 in the direction of the arrow A1 . The fact that as long as the crank pin 47 of the crank disk 48

j
is not in the neutral position according to FIG. 4, on

j the gear 44 act two forces, one of which by the The rack 39 of the slide 28 is transmitted directly to the gear 44. Since size and speed at least one of the two movements transmitted to the gear wheel 44 are adjustable are, by changing the position of the crank pin 47 on the crank disk 48, there is the possibility of the absolute Movements of the print template 29 on the one hand and of the object 25 on the other hand to vary, se that desssufoige also the Relative movement between these two parts can be changed. There is thus the possibility of using the crank pin 47 according to FIG. 7A set that in the direction of rotation 52 of the crank disk 48, the axis 45 of the gear 44 during the printing process in moves in the same direction 41 as the slide 28 with the object located thereon. The crank pin is covered to the illustration according to FIG. 7A - between the rotation axis 53 and the left edge of the crank disk 48. In this area, an adjustment of the crank pin 47 is conceivable, in which the stroke executed by the connecting rod 46 in the direction of arrow 41 corresponds exactly to the stroke of the specimen slide 28 from which It had been said above that he in turn had a special Has drive. If the above requirement is met there is no relative movement between the printing stencil 29 and the object 25, since at the same speed of the gear 44 and the

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Toothed rack 39 in the direction of arrow 41, the gear 44 does not rotate. It can therefore be assumed that the crank pin 47, if it is in its starting position to the left of the axis of rotation |

ι 53 is only set so that it is not located at that point which results in a speed which corresponds to the speed at which the specimen slide 28 is displaced in the direction of arrow 41. This point, at which the movement transmitted via the connecting rod 46 to the gear 44 in the direction of the arrow 41 is carried out at a speed which is equal to the speed of the rack 39 of the specimen slide, is referred to below as the zero point. That setting of the crank pin 47, in which the latter is located in the axis of rotation 53 of the crank disk 48 in a manner analogous to the representations according to FIGS. 4 and 7B, is referred to below as the neutral point. In this last-mentioned position according to FIGS. 4 and 7B, the crank pin 47 and connecting rod 46 do not perform any movements εus, so that the axis 45 of the gear 44 is also stationary. With this setting, only the rack 39 of the slide, which is moved in the direction of arrow 41, acts on the gear 44 with the result that this rotates counterclockwise and the rack 43 and thus the printing template 29 in the \ direction of arrow 51 moves. This means that in this case the object carrier 28 and the printing stencil 29 are moved opposite to one another at the same speed and with the same stroke. This setting is suitable for printing on objects with a medium {diameter, e.g. B. a development length of the printing

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Have image that is twice as long as the stroke of the slide 28. The rotation transmitted by the toothed rack 39 to the toothed wheel 44 leads to a displacement of the printing template 29, from the position according to FIG. 5 to that according to FIG. 6, the stroke of the slide 28 being the same as the stroke of the printing stencil 29

A displacement of the crank pin 47 from a neutral point according to FIG Fig. 7B to the left initially has the consequence that the racks 39 and 43 and soiüit slide 28 and printing template 29 move opposite to each other, but the extent of this counter-rotation with increasing displacement of the crank pin 47 decreases to the left. This means that on-! due to the shift, which is now the axis 45 of the gear 44 in the course of the rotation of the crank disk 48 in the direction of the arrow 52 to the right experiences the stroke of the rack 43 and thus the printing stencil 29 becomes smaller, but this stroke still takes place in the direction of arrow 51. The gear 44 rotates counterclockwise.

With increasing displacement of the crank pin 47 to the left take the extent of the counter-rotation of the rack 39 and 43 and thus the size of the stroke of the rack 43 from until the above mentioned zero point of the crank pin 47 is reached at which the speed of movement of the axis 45 of the gear 44 in the direction of arrow 41 is just as great as the speed at which the rack 39 of the slide 28 in the

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is moved in the same direction. A rotation of the gear 44 does not take place.

A further shift of the crank pin 47 beyond this zero point to the left has the consequence that the stroke that the axis 45 of the gear 44 performs is now greater. The same applies to the speed at which the axis 45 is shifted to the right, that is to say in the direction of the arrow 41, by the rotation of the crank disk 48 in the direction of the arrow 52. As a result, the axis 45 now leads in the direction of the arrow 41 with respect to the rack 39, so that the direction of rotation of the gear 44 is reversed. This now rotates clockwise. As a result, the rack 43 and thus the printing stencil 29 also move in the direction of the arrow 41, i.e. in the same direction as the rack 39 and the slide 28, although the speed with the slide 28 j

j on the one hand and printing stencil 29 on the other hand are moved, un-; is different. There is thus a reactive speed between the two parts, so that the

carried object 25 can roll on the printing stencil 29. ! This setting, with the object slide 28 and printing stencil ^

29 moved in the same direction is especially important for | on the printing stencil to be rolled objects with a small diameter useful, where the scope or development length of the

Print image is smaller than the stroke of the slide. j

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t · f

I · »I

■ I »·

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For objects with a large diameter or a development length of the printed image, which is larger than a double stroke of the slide 28, the crank pin 47 according to FIG. 7C on the other Side of the axis of rotation 53 attached to the crank disk 48, so that when the crank disk rotates in the direction of arrow 52: Connecting rod 46 in direction 51, that is, opposite to loading |

direction of movement 41 of the slide 28, is shifted «where j ; i

j Rack 43 and thus printing template 29 in the direction of the arrow 51 perform a stroke that is larger than that in the opposite ! The stroke of the toothed rack 39 and the slide 28 associated therewith takes place in the set direction 41. The stroke of the printing stencil is twice as large as the stroke of the axis 45 of the gear wheel 44. Overall, the result is a development length that is the same the sum of the two distances covered by the slide and the printing template during the printing process.

Those given above in particular with reference to FIGS. 7A-7C Explanations show that the screen printing machine according to

the invention to all practically conceivable possibilities and

requirements for printing objects can be easily adapted. It is essential that the parts to be moved relative to one another, i.e. the object, printing stencil, object carrier, etc., are only to be moved at half the speed of known machines in order to achieve the same throughput Since it can be assumed that the drive means normally hit the stencil, for example, during the printing stroke transmit an approximately sinusoidal speed, which in the

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If the middle area of the path to be covered by the template reaches a climax, the speed is reduced at the same time also a homogenization of the same, since the difference between the speed at the beginning and at the end the movement on the one hand and the maximum speed in the mid-r On the other hand, the leren area is qeringer. This also comes the:

"I.

Drupjc quality benefit. On the other hand, if the parts

be moved at the same speed as known Machines that double throughput can be achieved.

Another advantage that can be achieved by the invention relates to the configuration of the means of transport for the objects, which in the embodiment shown in FIGS. 1-7 is formed by the two chains 21. The latter are with brackets! 24 (Fig. 3 and 6) provided for the objects. In the case of known machines, it is necessary that the distances between the brackets correspond to the length of the largest circumference to be printed. Thus, even if there are several printing units arranged one behind the other, which are assigned to the same means of transport, the distances between these printing units are correspondingly large the greatest possible throughput of the printing machine cannot be used unless the spacing of the brackets on the means of transport also changes when the objects to be printed or the length of the circumferential surface to be printed are changed.

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be uttered. However, this is associated with a considerable amount of work. In contrast, when the teaching according to the invention is used, a shorter distance is also required for objects with a large diameter and a correspondingly long circumferential surface. 3. Possible between the holders for the objects, since when the parts are set according to FIG. 7C, the printing of a certain circumferential length is possible with a shorter lateral displacement of this object than with known machines.

In all the above-described cases, which are objects that are rolled on the printing stencil 29, the with the movement of the printing stencil 29 synchronous processing of the object 25 ensured by the aforementioned gear 37 (Fig. 3), which via the shaft 36 with the cup-shaped Centering element 35 is connected and otherwise meshes in a known manner with a toothed rack 54 which is carried by the carriage 40 of the printing stencil 29.

It has already been said in connection with the explanation of FIGS. 1-3 that the doctor blade 30 in the above-described Printing process is connected to the slide 28 in a fixed manner, so that in each case a synchronous movement between the object to be printed 25 and the squeegee 30 is guaranteed.

When printing such objects, due to their cross-section, the surface to be printed is developed

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or a part of the same is not possible on the printing stencil, the arrangement is made that bsisi applying the Pressure on the essentially flat surfaces of these objects avoids a relative movement between the printing stencil and the object will. Rather, in a known manner, the squeegee is opposite j

the other two parts, ie the printing template and the object, moved. To achieve this movement it is necessary that! - Based on the representation according to Figures 1-7 - doctor blade i 30 and printing template 29 in relation to the war conditions:

i can be swapped. That is, in this case, the printing stencil j 29 is connected to the specimen slide 28 and thus trasches its movement, wchingsgsn the case 3O is attached to the slide 40, | which is movable relative to the specimen slide 28, it also being true here that the movements carried out by both parts are directed in opposite directions or can be rectified.

Possible absolute and relative movements of the parts to one another resulting therefrom are shown in FIGS. 8 and 9, where in Fig. 8 the beginning and Fig. 9 the end of the printing process demonstrate. As in the exemplary embodiment according to FIGS. 1-7, it can be assumed that the objects to be printed 125 of a slide are held, which during the application of the pressure synchronously with the chains 121 in the transport direction 141 is movable. The object 125 and the printing stencil 129 are moved synchronously in the transport direction 141, whereas the squeegee 130 is shifted in the opposite direction 143. The result is that the length of the print image in the transport direction 141,

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the sides of the object facing the printing stencil 129 125 can be applied eoll, can be much larger as the stroke of the squeegee 130Jh sighting of the arrow 143, since the two movements of the squeegee 130 on the one hand and the printing stencil 129 and of the object 125 on the other hand add up to a total length which results in the maximum length of the print image.

Also in the embodiment according to FIGS. 8 and 9, the fact that the Printing process in the course of the advance transport of the objects 125 is carried out in the direction of arrow 141 without this transport being interrupted by the printing process, Disabilities or the like. Would experience. It is also essential that the mounting accessories carried by the chains 121 124, which are also suitable for receiving objects that can be rolled on the printing stencil, at the same time with their lateral boundary surfaces 155 serve to determine the position of the objects 125, which are rectangular in cross-section, or other shaped objects 125 in relation to the To fix chains 121 and thus to the printing devices.

In Figures 12-14 is an embodiment of the invention shown, which are used for printing on conical or conical | Objects. The drive and / or deflection wheels are here or the axles or shafts 75 carrying them (FIG. 2) are shown in this way! represents that the two chains 21 according to FIG. 12 occupy one position, in which the longitudinal axis 276 of the object 225 runs inclined in accordance with the cone angle, so that that of the printing stencil 229 facing generating line 227 runs parallel to the printing stencil. The slide 228 also takes one

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appropriate inclination.

To help with printing on conical or conical The principle of being able to proceed in the same way as in the embodiment according to FIGS. 1-7 is that with a circular arc Printing template 229 provided with print image 278 can be pivoted on the one hand around a stand 279 of specimen slide 228 in the printing plane and on the other hand to and fro on guide rod 242 moveable carriage 240 rotatably and longitudinally displaceably attached in the same plane. Regarding the movement sequences of the object carrier 228 with the object 225 located thereon on the one hand and the sieve slide 240 on the other hand, this applies to the embodiments according to FIGS. 1-7 what has been said, so that accordingly for example, when setting the crank point according to FIG. 7B, the object 225 from the starting position according to FIG. 14A at the beginning of the printing process reaches the end position according to FIG. 14B at the end of the printing process, during which time it is the distance 280 travels. During the printing process, the printing stencil 229 is in the opposite direction from the starting position 14A has been pivoted into the end position according to FIG. 14B, which allows a movement of the screen slide 240 in the direction of the Arrow 251 corresponds. The pivot point 281, about which the printing stencil 229 executes the pivoting movements, is inside an elongated hole 282 mounted lockable, so that an adjustment of the position of the pivot point 281 as a function of the respective conditions, e.g. B. Dimensions of the to be printed Object 225 and the like., Is possible.

7146630 26.8675

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The one on the opposite side of the printing stencil 229 Connection to the sieve slide 240 takes place via a z. B. fork-shaped intermediate piece 283 with elongated holes 284 is provided, in which projections 285 of a ring 286 engage, which is rotatably mounted about a pin 287. The one through the elongated holes 284 made it possible for the intermediate piece 283 and thus the printing stencil 229 to be displaced relative to the screen slide 240 serves to compensate for the length during the pivoting movement of the printing stencil 229 about the pivot point 2 81, since the distance between the pivot point 281 and the pin 287 changes during the pivoting movement.

Distance 290 indicated in Fig. 14A gives the distance of the receiving elements 24 of the chains 21. The drawing shows that the used for the printing process Distance 280 is significantly shorter than the total distance between two objects carried by the ketcen 290, so that the difference between the distances 280 and 290 can be used for the object, stencil and squeegee (the latter is not shown in the illustration according to Pig. 12-14 for reasons of clarity) to be disengaged, to detach the object from the slide. Microscope slide, printing template and move the squeegee back to the starting position in which the slide picks up the next object and there the object, Bring the printing stencil and squeegee back into contact with one another so that the next printing process can begin. These steps

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also apply to the others shown in the drawing * presented embodiments.

It has already been stated that the slide 28 performs a reciprocating movement, the movement being in the transport direction 41 takes place synchronously with that of the transport chains 21 and thus with the movement carried out by the objects »Farner: it is necessary that the two centering elements 34 and 35 can be moved relative to one another in the axial direction of the object, so that before the start of the printing process, the object between the;

both centering elements can be brought, which then closed will. After finishing the printing process that is!

To bring the object back out of the centering elements that are to ι need to be moved apart for this purpose. In the figures 1, 10 and 11 an embodiment is shown, which makes it easy Way allows to perform the aforementioned movements. : First of all, two bars 56 running parallel to the upper run 26 of the chains 21 are attached to the frame of the screen printing machine 20, on which slides 57 which can be pushed back and forth in the direction of arrows 41 and 51 are guided. The length of this Rods 56 determine the maximum stroke length of the slide 28. The two carriages 57 in turn carry two transversely to the guide rods 56 extending cross members 58 on which two base plates 59 and 60 in the direction of arrows 61 and 62 independently can be pushed back and forth from one another. On these two base plates 59 and 60 is. one of the two centering elements 34 and 35 (Flg. 3) attached, for example in such a way,

■ I · ■ '

- 28 - j

that the base plate 59, the centering element 35 and the base plate; 60 carries the centering element 34. These last two parts; are not shown in FIGS. 10 and 11. j

Each of the two base plates 59 and 60 is provided with internal teeth 63 which, for the sake of simplicity, are only shown on the base plate 6O. A drive pinion 64 which rotates in the direction of arrow 65 is assigned to this internal toothing. Furthermore, each base plate 59, 60 is provided with a circumferential, approximately groove-shaped guide track 66 into which a guide roller 68 carried by the machine frame 67 engages.

The slide shown in FIGS. 1, 10 and 11 works in such a way that, based on the position of the parts according to FIG. Pinion, not shown in the drawing, both base plates 59 and 60 are displaced together with the cross members 58 carried by the carriage 57 in the i direction of the arrow 41, the two carriage j

th 57 slide along the guide rods 56 in the course of this movement. This movement in the direction of arrow 41, which is carried out synchronously with the transport movement of the chains 21, takes place during the printing process. The two base plates 59 and 60 assume a position in which they have the smallest distance from one another, so that the centers, not shown in FIGS. 10 and 11 of the drawing, are carried by them.

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trier elements are in engagement with the object to be printed, So take that position in relation to the object, which is shown in Fig.. At the end of the advancement of the slide 28 in In the direction of the arrow 41, the drive pinion 64 moves into the

curved area 69 of the internal teeth 63 and the guide roller j

68 into the correspondingly curved region 70 of the guide track 66. This has the consequence that the rotary movement of the drive pinion 64 now causes the base plate 60 to be displaced outwards, that is to say in the direction of the arrow 61. The same applies to the base plate 59 and the drive pinion assigned to it, it being assumed that the movements are in opposite directions. The movement of the base plate 60 in the direction of the arrow 61 accordingly corresponds to a simultaneous movement of the base plate 59 II in the direction of the arrow 62, in order in this way to move the two centering elements carried by the two base plates apart. This, ie the moving apart, is done in order to release the object at the end of the printing process, which is then transported on by the chains 21 or 121.

After the drive pinion 64 has passed the curved area of the internal toothing 69, the specimen slide 28 is in the direction of of the arrow 51 along the guide rods 56 against the transport direction 41 of the chains 21 or 121 into the starting position, which is reached approximately when the drive 64 has reached the second curved region 71 of the internal toothing. The next object to be printed is now located between the two supported by the base plates 59 and 60.

7146630 26.0675

- 30 - ·· ■ · ·· ■ " .JU

genes centering elements that are moved towards each other, that is execute a closing movement when the curved area 71 of the internal toothing 63 passes the drive pinion 64. During the procedure of the drive pinion 64 in the subsequent linear area of the internal toothing, i.e. in that area in which In the representation according to Figures Io and 11 pinion 64 and internal toothing 63 are in engagement, the slide is synchronized in the direction of arrow 41 with the transport chains 21 or »

j 121 is advanced in the manner already described, with during

j this forward movement also applies the print image to the

Object takes place.

i
i

Deviating from the design of the drive for the specimen slide described above in connection with FIGS. 1, 10 and 11 According to Figures 4 and 3, the arrangement can also be made in this way be that if there is only one base plate 31 carrying the two centering elements 34 and 35, these of two Carriage 157 is carried, which can be pushed back and forth on two guide rods 156 running parallel to the transport direction are. A transverse traverse 158 is arranged between the two carriages 157, on which another Intermediate slide 195 is arranged displaceably. The latter is connected to a respective transport element via drivers 196. This can be a revolving disk, a chain 197 or the like. That is on the intermediate slide 195 and thus on the Object carrier 28 transmits a reciprocating movement running parallel to the transport path of the objects. The movability of the intermediate slide 195 in the direction of the cross member 158

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only serves the purpose that depends on the direction of transport of objects ödet * u.c «öyänrichtung äbwsiqhsiiäcn movements, the Compensate transport elements 197.

In contrast to the embodiment according to FIG. 1, IO and 11 are that is to say, the transverse movements of the transport elements 197 and the drivers 196 are not used for the two centering elements 34 and 35 to open or close in the direction of arrows 61 and 62!

j sen. Rather, it is necessary here that the centering elements relative to the base plate 31 and the standards 32 bsw supporting them. 33 separately in the direction of arrows 61 and 62 back and forth and TieifVefecniiäebäir Snfciirsait are. \

In addition, there is the possibility of the slide 28 or parts the same, in particular the centering elements 34 and 35 carrying the object 25, to be arranged so that they can be moved vertically up and down. These Vertical movability can be used to remove the individual object when the objects 25 are picked up by the object carrier 28 the associated recording element 24 of the chain 21 or 121 to the top to lift out and, at the end of the printing process, to lower it back into the contact element that was running synchronously. On the other hand, this vertical mobility, which is indicated in Fig. 3 of the drawing by the arrows 72 and 73, also serves to keep the objects in and out of contact with the printing stencil bring.

714SB30 2R0B.75

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This was assumed in the previously described embodiments that a special object carrier 28 is provided in addition to the circulating transport element 21. Apart from there is also the option of dispensing with the slide so that the printing process can be carried out when the ! Objects are in a position ready for printing on the transport element. The arrangement is then to be made in such a way that one of the Toothed rack 39 corresponding transmission means, which can then not be carried by this due to the lack of a special specimen slide, can be moved back and forth in the usual manner arranged iat, whereby, as in the cases described above, care must be taken that the movement is in the direction of transport of the objects takes place synchronously with the movement of the means of transport, for example the chains 21 or 121.

7146630 26.0R75

Claims (18)

- 33 - Claims for protection 1. Screen printing device with a carrier for the object to be printed, which can be moved in the same direction with a squeegee, and with a printing stencil, characterized in that the adjustable stroke back and forth movable printing stencil (29) and the squeegee (30) are in the same direction or can be driven in opposite directions at a relative speed to one another and the object carrier (28) for printing objects that can be rolled on the printing stencil (29) is arranged to be movable back and forth with a constant stroke. 2. Si / jbdruckvorrichtung with a carrier for the to be printed Object which can be moved in the same direction synchronously with a printing stencil and with a movable squeegee, characterized in that the printing stencil (129) and the one with an adjustable stroke reciprocating doctor blade (130) in the same direction or in opposite directions are drivable with a relative speed to each other and the slide for printing objects that cannot be rolled over with | is arranged to be reciprocable in a constant stroke. , 3. Screen printing device according to claim 1 or 2, characterized in that the slide (28) can be driven and the squeegee (3) or printing template (29) is connected to the slide (28). 4. Screen printing device according to one of claims 1 to 3, characterized | characterized in that the squeegee (30) and the printing stencil (29) have a drive derived from the movement of the specimen slide (28). 7146630 26.0R.7S - 34 - indicate where a reciprocating potentiometer (44) is interposed. 5. Screen printing device according to claim 4, characterized in that the rotary element (44) is assigned a crank drive, whose crank point is adjustable. j 6. Screen printing device according to claim 1 or 2, characterized in that that the object carrier (28) is carried by carriages (57, 157) which run parallel to the direction of movement (41) Rods, rails or the like. (56, 167) are guided. ; 7. Screen printing device according to claim 6, characterized in that that the carriages (57, 157) carry at least one traverse (58, 158) running transversely to the transport direction (41, 141) on which at least one base plate (59, 60) or an intermediate slide (195) is arranged, on which a preferably circumferential Drive means (64, 197) engages. 8. Screen printing device according to claim 7 _f, characterized in that two base plates (59, 60) are provided, each of which is provided with a toothing (63) on which a drive pinion or the like. (64) engages for reciprocating movement. 9. Screen printing device according to claim 8, characterized in that that the toothing (63) is designed as internal toothing. 7146630 7.B.PR.7B - 35 - 10. Screen printing device according to claim 9, characterized in that that the internal toothing (63) is long, with the two mutually parallel sections in the direction of movement (41) of the objects (25) is designed to run and both base plates (59, 60) with a long, the internal toothing (63) corresponding guide track (66) are provided, a guide roller (68) engaging in this guide track (66). 11. Screen printing device according to one of the preceding claims, characterized in that for printing conical or! similarly shaped objects the printing template (229) in the printing plane on the holder (210) assigned to it and on the slide (228) is mounted pivotably in such a way that a longitudinal displacement of the printing stencil (229) is possible at at least one fastening point. possible with respect to the holder (210) or the specimen slide (228); is. 12. Screen printing device according to claim 11, characterized in that that the fastening point connected to the slide for setting one of the conicity of the object to be printed on Radius * is adjustable in the direction of the longitudinal axis of the object. 13. Screen printing device according to one of claims 1 or 2, characterized characterized in that, in addition to the object carrier (28), a revolving transport element (21) is provided for the objects (25). 7146630 2R.nB.75 - 36 - j 14. Screen printing device according to claim 13, characterized in that the axis of the guide, deflection or drive wheels, rollers \ , or the like. (23) of the transport element (21) opposite the plane in! \ ι which is the application of the pressure, arranged pivotably 15. Screen printing device according to one of claims 1 or 2, characterized in that the preferably as a pair of chains (21,
121) designed transport means can be displaced with respect to the drive, deflection and / or guide wheels (23) or the like, the chains (21, 121) with brackets or receiving elements (24, 124)
for the objects (25, 125) are provided. j 16. Screen printing device according to one of claims 1 or 2, at
which of the slides is provided with the centering element holding the objects, characterized in that the centering elements (34, 35) in the direction of the longitudinal axis of the object (25) to one another
are relatively displaceable and have a greater distance from one another during the return movement of the specimen slide (28) in its starting position than during the printing process. 17. A screen printing apparatus according to claim 16, characterized in that slides (28) and / or centering elements (34, 35) are arranged in height 'adjustable. 18. Screen printing device according to claim 13, characterized in that that along the means of transport several printing stations one behind the other β η gp <"* T * d η <? f; are. 7146630 2B.0B.75