DE2151431C3 - Device for moving the stencil and squeegee holder back and forth in a screen printing machine - Google Patents

Description

2. Device according to claim 1, thereby clamping again.

indicates that the lock from one with The invention is based on the object of a

the machine frame (9) connectable bolt ao device of the type described above

(50) or the like. That releasably improve with each that they improve in terms of their structure and

to be determined holder (14 or 18) or is simplified in terms of their handling. Into the-

can be connected to one of these assigned parts. special is to be achieved that a changeover

3. Device according to claim 1, characterized in that the device is made of objects with a flat surface indicates that each holder can be used as platlenför- 35 objects with a curved surface or vice versa Slide (14, 18) is formed, which returns with a few simple steps and without an ins a rack (25, 26) od. The like. Is provided, weight-decreasing expenditure of time is possible.

and both racks (25, 26) with one tooth. The invention proposes to solve this problem

wheel (27) comb, which can be moved back and forth that both brackets with the back and forth

is arranged. 30 constant and un-

4. The device according to claim 3, characterized thereby indirectly in engagement, while in each case one indicates that each rack (25, 26) is locked in a holder. The main advantage of the own gear is assigned and both tooth device according to the invention is that wheels that can be moved back and forth together to switch to an object with an andegeierter and with respect to the surface outside of them, only one lock is released and guided rotary movements can be made firmly together with another locking effect are bound, must have different diameters. The creation or disconnection of connections. gene, couplings od. The like. With respect to the drive

5. Device according to claims 1 and 3, any parts are omitted. It is also not necessarily characterized in that each holder (14, 40 agile, special settings, adaptations 18) or each slide with, preferably in the od. Furthermore, there is an approximately wedge-shaped roll in cross-section which is overall simple and clear structure which (12a, 12b; 13a, 13b) is provided, which in the corresponding device, in particular also by reducing speaking guides (10a, 10b; Ha, lift) of the moving parts of the same, so that the disturbance starts. 45 due date is reduced and smoother running is

6. Device according to claims 1 and 3, is aimed.

characterized in that for the drive of the lock can be made from a machine

each displaceable carriage (14 or 18) inner frame connectable bolts or the like exist,

a central shaft (30) is provided. the detachable with the bracket to be fixed in each case

50 or one of these associated parts can be connected.

Other configurations are also conceivable, e.g. B.

such that each of the two brackets is assigned a special releasable locking device,

• The invention relates to a device for preventing the Hal-

and moving the stencil and squeegee holder 55 is able to fix. In any case

tion in a screen printing machine for objects with it is sufficient that between the machine frame or

flat and curved surface, with both sharks having a different fixed part and the

connections to a fixed frame with an alternating bracket

wise reciprocally drivable and means that a movement of the bracket in each

a lock on the frame can be determined. 60 fall prevented.

One by the German Auslegeschrift 1 293 164 According to a further proposal of the invention

known device of this type has the disadvantage that any holder can be used as a plate-shaped slide

a relatively complicated structure. be formed, the od with a rack. Like.

This is due, among other things, to the fact that both racks are connected to one

lead that next to the two brackets for Scha- 65 mesh gear, which can be moved back and forth

blone and squeegee an additional drive schiit- is arranged. A design is possible here,

th is provided. The latter, the back and forth, with each rack having its own gear

is drivable away, serves for the transmission of the assigned, and both gears, which are common

3 4

arranged to be reciprocable and with respect to each of the two brackets 14 and 18 isi uater the rotary movements carried out by them fixed interposition of a connecting link are connected to each other, different diameters 23 and 24 with a rack 25 and 26 gauges exhibit. see. The two racks run parallel to the

Rack drives are - also in combination - 5 guides 10 a, 106 and 11 a, 11 b. Yours is a

hang with screen printing machines - assigned by the USA.- Gear 27, which is in constant mesh with

Patent 2 866 405 and by the German Aus the two racks 25 and 26 and its-

Legeschrift I 293 164 known per se. is carried on the side by a crank arm 28, whose

When only one end area 29 is provided that is free for both racks and carries the gear wheel 27 common gear will have the stroke of the moving io fork-like configuration, Baren rack opposite the stroke of the toothed The drive of the crank arm 28 is carried out by rades doubled In the other case, the stroke of a central drive shaft 30, which is connected to the movable rack opposite the stroke of the rocker arm 28 facing away from the end of a lifting gear as a function of the diameter cam 31. The drive shaft 30 is a rule difference between the two gears, gear 32 is connected upstream, via a belt changes. In general, it will be advantageous for both or the like 33 to be driven by a motor 34. To connect gears firmly to a common axis by means of the drive shaft 30 in rotation. Another possibility is to use a lifting cam 31 that can be set by means of a bolt To use a two-stage gearwheel, with the double-armed lever 36 pivotably mounted on 35 two ring gears ao assigned to a common base body, the up and down movements of different diameters are attached. The carrying and adjusting device 37 for the use of two objects printing in the manner described. This Trag- and Jumit each other Connected gears is generally a bull device consists essentially of two common have the consequence that the two racks by means of a cross member 38 connected vertical Fühin are arranged on different levels. Dies as rongsstangen 39, which is in on the machine frame however, both with regard to the structure of the submissions 40 are guided. The up and direction and also with regard to the mode of action downward movements on the support and adjustment device irrelevant. In addition, the invention provides 37 transferring double-armed lever 36 engages the also the possibility of using cross member 38 instead of gears.

and racks other means, e.g. B. Friction wheels and 30 The two guide rods a 39 carry under ZwJ-

To use friction strips, chains or the like. circuit connection of fixed arms 41 a

According to a further proposal of the invention, console 42 which can be part of the support and adjustment device the arrangement should be made so that each holding 37 and with means for the reception and burrowing or each carriage is preferably provided with a stiffening of the object 22 to be printed Cross-section of approximately wedge-shaped rollers is 35. As the object 22 can be seen in the drawing that run in appropriate guides. provided embodiment is a bottle is For the drive of the respective displaceable carriage, one of these means is designed as a mandrel 43, which is shown in a central shaft can be provided. the neck of the bottle is insertable, in the case of

In the drawing, an embodiment of the printing of plastic bottles is this mandrel

Invention shown in the scheme. It shows 40 43 with eiucm channel for the supply of pressure

F i g. 1 the side view of a screen printing machine, air can be provided. Dsis other holding and

partially in section, bull element is designed as a seat 44 in which

F i g. 2 the associated front view without the bottom end of the object 22 being insertable.

actual pressure tool and the holding means for this seat 44 is rotatable about its longitudinal axis and

the object to be printed. 45 provided with a shaft on the coaxial to the seat

The machine frame 9 is arranged with a total of four 44 a friction wheel 45. The latter works

linear guides 10 a, 10 b; Ua, Hb provided. while applying the pressure with a

These guides, which have a wedge-shaped cross-section of friction strip 46 together, from the extension 19 of the

have, in the case of the plate-shaped holder 18 shown in the drawing for the printing shell

th embodiment incorporated in the frame. 50 blone 20 is worn. When printing on such

However, they can also be designed as rails, objects that are attached to the during the printing process

which are attached to the frame in a suitable manner. Rolled into template 20 is via friction wheel

the guides run rollers 12 ″, 12 b or 13 a, 45 and friction strip 46 a forced synchronization of the

13 b, the circumferential areas of which correspond to the wedge-shaped transverse lifting movement of the template with the rolling movement

cut of the guides are adapted. 55 this object 22 reached.

The rollers 12a, 126 carry a carriage 14. Furthermore, a friction wheel 47 is assigned to the seat 44,

formed plate-shaped bracket, on which can be driven under the via a cardan shaft 48, where '

Interposition of an extension 15 and one between the friction wheel 47 and the articulated shaft 48

by the latter carried pneumatic cylinder 16 slip clutch is switched on. The seat 44 will

a doctor blade 17 is attached. 60 due to the design described above

The rollers 13 a, 13 b are a second, as a device rotates around its longitudinal axis, with the aim of a

Slide 18 formed plate-shaped holder on the bottom of this seat or on another suitable

assigned, which via an extension 19 the in F i g. 1 nth position with a fitting part with a corresponding

the drawing only indicated printing template corresponding counterpart on the object to be printed

20 wears. In this case, special adjustment means 21 are to be brought into engagement between each other. In this way it is switched which allow the height of the ranges that the object with respect to its angular position Printing template 20 to the dimensions of each in the circumferential direction in a certain way

object 22 to be printed. Template 20 is aligned. By the way, is the

2 151 43

5 6

Console 42 with the parts located on it can be adjusted. This then also applies to the result

compared to the arms 41 in the carriage driven by the gearwheel in the drawing, where-

Pivotable position shown in dash-dotted lines. at only the hub executed by it

Each of the two carriages 14 and 18 is double in size due to the conditions already described

Machine frame 9 assigned an opening, 5 pelt is so large.

of the in F i g. 1 of the drawing which shows the opening 49 assigned to the slide in the arrangement explained above and 14. Movement of the parts, the printing of objects is also provided, which is provided in each case, which can be inserted against one of the two openings during the printing process and rolled over the stencil,
at the same time in the respectively assigned carriage io. B. in cross-section rectangular bottles or is connected. The choice of the opening or its flat objects that are not on the pressure of the associated slide depends on which template can be rolled.

17 - movable and which should be fixed. 15 th 18 associated opening locked. This In the situation shown in the drawing without difficulty and practically within kür-parts if the bolt 50 blocks the movement of the measure to be carried out the time is sufficient, Squeegee-carrying carriage 14, so that the carriage to reverse the movement conditions.

18 and thus the stencil 20 to and fro. Perform movement. 20 template 20 stationary, whereas slide 14 and

The screen printing machine shown in the drawing so that squeegee 17 has a reciprocating motion machine works in such a way that it executes via the central one, with respect to the size of a drive shaft 30 of the individual strokes as crank rocker 28 or their setting The same eccentric drive formed a reciprocating condition that already transfers when converging to the gear wheel 27, which is in engagement with the movement of the slide 18 and thus the two racks 25 and 26. the printing stencil 20 had been explained.
Based on the shown in the drawing, a further essential advantage of the position of the parts is to be assumed that the screen printing machine is that the rack 25 assigned to the carriage 14 is fixed-drive both of the movable carriage is arranged standing, since the Carriage 14 in the bc 30 as well as the support and adjustment device 37 are derived in the manner already described by the bolt 50 ar- a central drive shaft 30, ictiert is. From this it follows that during the through so that it is possible in a simple way to synchronize this operating crank arm 28 on the gear 27 movements in such a way that in the carried to and fro movement the latter has a stroke direction of the doctor blade 17 or printing mechanism on the Rack 25 rolls off. The also 35 blone 20, the support device 37 is in its upper meshing with the gear 27, the printing stencil position, in which the slide 18 carrying the object 20 to be printed rests against the printing stencil, whereas during 26 it is linear by the gear 27 the counter-rotating stroke movement of squeegee 17 or shifted, this movement of the rack template 20, during which the squeegee 17 is lifted by 26 and thus the carriage 16 as well as the printing 40 the cylinder from the printing template 20 due to the template 20 at the same time from the tooth The support device 37 is located in a lowered wheel about the pivot 51 of rotation, in which the object 22 is in a movement that is twice as large as the linear distance from the printing stencil 20. During displacement of the gear wheel 27. In the manner described above for this position of the support and adjustment device, the object to be printed is inserted back and forth or the movement of the carriage 18 and thus the printing template is printed Object reached from the support and adjustment device 20 whereby the extent of this movement, old 37 removed. The already mentioned verso, the length of the individual swiveling of the bracket 42 from the template 20 into the strokes shown in the drawing depends on the point at which the dash-dotted position should the hand of the crank rocker 28 at that of the zen 50 facilitate handling of the objects, since in this way the drive pulley carried by the central drive shaft 30 acts on the distance to the printing stencil even more enlarged. Advantageously, the arrangement is so.

taken that the pin 53 of the drive pulley 52, for additional support and guidance of the on which the crank arm 28 engages, on the gear wheel 27 there are strips 54 on the upper and lower sides Drive pulley is slidably mounted so that 55 mounted parallel to the racks 25, 26 run over one by a displacement of the pin 53 and advantageously effected from one material Change of the crank point the length of the stand in relation to that of the gear 27 from the gear 27 executed stroke continuously has a low coefficient of friction

1 sheet of drawings

Claims (1)

Back and forth movements on one of the two holders for stencil or squeegee. It is only patent claims: borrowed the drive slide directly and constantly connected to the drive 5 causing the back and forth movements. The brackets for the template and 1. Device for moving the calipers back and forth, however, are alternately with this drive template and to couple the squeegee holder in a screen slide. This completes the changeover from printing machine for objects with flat and one on the other type of to be printed curved surface, both brackets objects cumbersome and time-consuming, because jjean a fixed frame alternately because the connections between the drive slide and movably drivable and to solve by means of th and the one bracket and then a lock on the frame can be determined, the connection between the drive carriage and the characterized in that each other holder is to be produced. In addition Brackets (14, 18) with which the to and fro comes that the bracket for the squeegee is always new movement causing drive (27) constantly and 15 must be aligned in their position. Immediately in all cases are in engagement, during each len also clamping rings must first be loosened, aiseein The bracket (14, 18) can then be moved and then locked in the new position