DE1275074B - Device for printing hollow bodies - Google Patents

Description

Device for printing hollow bodies The invention relates to a Device for printing hollow bodies with variable in the direction of their longitudinal axis oval cross-section after the screen printing process with below the flat printing screen arranged, on a partial circular path moving arrangement for clamping and Actuations for raising and lowering the hollow body.

The printing of such hollow bodies after the expedient in itself Screen printing is prepared by the uneven curvature of the outer wall of the Hollow body difficulties, since an exact starting position at the start of printing is required.

In addition to the semi-automatic screen printing machines working in the cycle process, in which the body to be printed is inserted by hand into a receiving device and then printed by machine by rolling contact with a screen, are devices for printing hollow bodies with in the direction of their longitudinal axis variable oval cross-section became known, where below the flat Printing screen on a partial circular path moving arrangements for clamping as well as Actuations for raising and lowering the hollow body are provided.

These devices operate intermittently. Since admission and departure of the body is to take place in the same place, the body carrier must perform perform a full 360 ° rotation during the printing process. This results in dead times in operation, which are very disadvantageous.

The invention is based on the object of a fully automatic screen printing machine to create, in which the goods to be printed are continuously fed into the required Initial position brought, continuously printed and then for further processing is delivered.

To solve this problem are according to the invention in the conveyor one that continuously feeds the hollow bodies to be printed and the printed ones Hollow body continuously forwarding conveyor engaging recordings to tilt the hollow body with respect to its longitudinal axis for the printing process and Carrier for lifting the inclined hollow bodies into the clamping area of the assemblies provided, the arrangements being movable back and forth on the partial circular path.

The receptacles for aligning the hollow body are useful as a ramp plate or run-up fingers. Preferably the supports are below and in the area the conveyor device arranged to be height-adjustable and have at least one, preferably two or more pressure fingers bent to match the shape of the hollow body, Levers or forks on. These are arranged interchangeably, and the recordings are arranged in their position (inclination) changeable. Below the sieve or sieve slide and above the lifting device formed by the carrier is a upward moving hollow body, preferably an elastically intercepting counter holder or a braking device intended. The jig carrying the assemblies is below the screen with two opposing pressure levers that are positively connected to one another equipped, with one of the arrangements on a rotating disc, such as a gear, is attached, which is synchronized by a main drive device by means of a rack is movable.

In a preferred embodiment, the clamping device is a collecting device, consisting of a collecting plate or finger, for the ejected Downstream hollow body in the area of the conveyor.

One or more chains or belts equipped with carriers run according to the invention as a conveyor in the area of as a support for the Solid slide rails used for hollow bodies.

The arrangements according to the invention ensure that the hollow body always have the same distances from one another on the conveyor. Since the The transfer and delivery station for the hollow bodies represent two different facilities, which are spatially separated from each other, downtimes are completely avoided. Also is for the execution of a printing process one in time and a very short circular segment movement of only about 90 ° is required.

The device described operates continuously by machine.

An exemplary embodiment of the invention is shown in the drawing. It shows F i g. 1 is a side view of part of a machine for continuous Printing of objects with an oval cross-section, in particular bottles or the like, partially sectioned and in a reduced representation, FIG. 2 is a front view the same machine in longitudinal section according to the section line I-I in F i g. 1 and F i g. 3 is a side view of part of the same machine with drive means.

A machine for printing objects with an oval cross-section, in particular bottles or the like, according to the invention has a horizontally arranged support plate 11 between a machine stand 10 in the upper area, around which an endlessly via two driven gear wheels (not shown) in the longitudinal direction of the machine ) circulating transport chain 12 is arranged. This transport chain 12 carries two opposite, outwardly angled support strips 13 a, 13 b laterally in the hinge points at certain intervals, on each of which a push angle or driver 14 is attached with its vertical leg in the direction of movement. To the side of the transport chain 12, slide rails 15 a, 15 b, which are attached to the support plate 11 and extend over its entire length, are provided at the level of the push bracket 14 to support the body to be printed which is moved by the push bracket 14; for the lateral guidance of the sliding body, guide plates 16 b, 16 a corresponding to the length of the slide rails 15 a, 15 b and corresponding to the length of the slide rails 15 a, 16 a are attached perpendicularly to the support plate 11.

A printing device 17 arranged above the transport chain 12 is movably mounted in two opposite frames 18 a, 18 b, in such a way that in the upper region of these frames 18 a, 18 b there is a guide axis 19 a, 19 b running parallel to the transport chain 12 , each receiving a plain bearing 20 a, 20 b. The upper side of the slide bearing 20 a carries an angled support 21, in whose fork head 21 a directed towards the central machine area a pivot axis 22 is mounted, about which the support frame 23 of the printing device 17 can be pivoted. The other end of the support frame 23 is provided with a clamping device 24 which, with its fastening bolt 24 a, is guided so that it can be pivoted vertically in a slightly curved fork guide piece 25 arranged vertically on the slide bearing 20 b.

The underside of the support frame 23 holds a fastening plate 26 in which a frame 28 is attached in the area of the transport chain 12 by means of screw bolts 27 a, 27 b, which frame receives a sieve 30 clamped by screws 29. This frame 28 with sieve 30 can be adjusted in height by an adjusting nut 31 a, 31 b screwed onto the screw bolts 27 a, 27 b above and below the fastening plate 26. An axle 32 mounted in the upper part of the frame 18a carries a boom 33 which can pivot about this and on which a vertically movable doctor blade 36 hangs in a bearing body 34 by means of guide rod 35, which can be displaced or moved in the horizontal direction by a bearing body 37 equipped with a dovetail guide . is interchangeable. This doctor blade 36 acts as a paint scraper for the screen 30.

Below the support plate 11, in the area of the frame 18 a, an angle support 38 with a ring bearing 39 is screwed to the machine stand 10, which supports a vertical guide column 40 protruding through the support plate 11. This guide column 40 carries an axial bearing 41, which has a holding arm 42 on one side at the upper end, through which a threaded spindle 44 mounted vertically in the ring bearing 39 and in a guide bearing 43 engages. This threaded spindle 44 has an adjusting nut 44 a, so that by turning this adjusting nut 44 a, the threaded spindle 44 moves the axial bearing 41 through the holding arm 42 on the guide column 40 up or down. Opposite the holding arm 42, the axial bearing 41 is provided with an arm 45 in which a horizontally arranged pin shaft 46 in ball bearings or the like can rotate. On the free end of the PTO shaft 46 is fixed by means of a in the front end thereof engaging countersunk screw 47 a corresponding to the settlement diameter gear 48 that meshes with an upper slide bearing 20 on a mounted rack 49; two in longitudinal slots 49 a, 49 b guided screws or the like. Hold this rack 49 adjustable in height on the sliding bearing 20 a.

A receiving device for the bodies to be printed is fastened with its receiving sleeve 50 in the upper region of the gearwheel 48. This receiving sleeve 50 has a spring 50 a acting as an ejector device; which pushes the printed body quickly and safely out of the receiving sleeve 50 after the printing process. A reciprocating movement of the rack 49 sets the gear 48 in a part-circular pendulum motion, the path (deflection and amplitude) of the gear 48 being the same on both sides and being determined by the size of the surface of an object to be printed.

A rigidly arranged pivot or pressure lever 51 is mounted on the central part of the pin shaft 46, the end of which is connected to the end of an opposing pivot or pressure lever 53 by a rod 52 that can be pushed into one another. This second pivot lever 53, which is also arranged vertically, encloses with its upper end a pin shaft 54 in its central part. The part of this spigot shaft 54 directed towards the central region of the machine carries an eccentrically mounted and vertically adjustable second receiving device 55 for the objects to be printed. This receiving device 55 has a pressure medium cylinder 55 a, which at the end presses a pressure sleeve 55 b against a clamped body 56 during the pressure (cf. FIG. 2).

Below the frame 18 b, a threaded spindle 60 with a rotary handle 60 a is rotatably mounted in the machine stand 10 on an inwardly directed support frame 57 by means of flange bearings 59 a, 59 b. On this threaded spindle 60 a composed of profile bars, with its bearing block 61, the threaded spindle rests 60 enclosing carriage 62, which carries a vertically upstanding guide column 63rd The guide column 63 is surrounded by an axial bearing 64, through whose one-sided holding arm 65 a threaded spindle 67 mounted in annular bearings 66 a, 66 b engages. An adjusting nut 67 a sets the threaded spindle 67 in motion by turning, so that the axial bearing 64 with its holding arm 65 comprising the threaded spindle 67 is moved up or down on the guide column 63. A bracket 68, which is arranged opposite the holding arm 65 and faces the body to be printed, rotatably accommodates the spigot shaft 54 carrying the second receiving device 55.

The possibility of clamping bodies of different lengths between the arrangements or receiving devices 50, 55 is achieved by rotating the threaded spindle 60 to move the carriage 62 with the guide column 63, boom 68 and the receiving device 55 attached to it towards the printing device or away from the required body length can be. In order to be able to print on bodies with different degrees of curvature, the machine according to the invention can be adjusted in height of the arrangements or receiving devices 50, 55, for which purpose the gearwheel 48 is exchanged and the height of the axial bearings 41, 64 with brackets 45 is changed by means of threaded spindles 44, 67 , 68 is required (see Fig. 2).

The guide plates 16 a, 16 b each have an angle piece 100 on their outside, on the end face of which a retaining plate 101 a is attached. This holding plate 101 a is connected by means of a hinge 101 b made of rubber, leather or the like to a counter holder 102 , which presses elastically on the bodies conveyed upwards into the pressure position and brings them into rest position. Between the baffles 16 a, 16 b rests an upwardly bent run-up plate 98 serving as a receptacle, variable in its angular position and which gives the body 56 to be printed its printing position.

In the middle part of the machine stand 10 , an intermediate floor 69 is introduced below the support plate 11, which carries the lifting device for introducing the bodies to be printed into the receiving devices 50, 55. In a sliding bushing 70 resting on the intermediate floor 69 slidably mounts a push rod 71 with a dovetail guide 72 provided at its upper end the transport chain 12 are provided. The dovetail guide serves for the horizontal adjustment of the stand 74, in which the pressure fingers 76 can be used for differently designed bodies 56.

downward and held by an angle lever 78 a tension spring 78 held in contact with the cam disk 80 with uniform tension.

The lower end of the push rod 71 is articulated to a pivot lever 77. In the rear area of the pivot lever 77 , a cam disk 80 is mounted, on which the pivot lever 77 is supported with a feeler roller 79. This feeler roller 79 is attached to the end of the pivot lever 77, according to This cam disk 80 moves the push rod 71 and thus the fork-shaped pressure finger 76 up and down, since at the smallest distance from the pivot point 80 a of the cam disk 80 to its outer diameter, the pressure fingers 76 of the pivot lever 77 and the lifting elements linked to it are in the uppermost position and when the highest point of the cam disk 80 is reached by the feeler roller 79, the pivot lever 77 is pivoted downwards about its pivot point 84, so that the pressure fingers 76 are thus also transmitted by means of the push rod 71 in stand in the lowest position. Due to its shape, this cam disk 80 allows the pressure finger 76 to constantly move up and down.

To set the desired lifting height of the pressure fingers 76, two pillow block bearings 81 a, 81 b with threaded bolts 82 mounted horizontally therein are provided on the intermediate floor 69 in the central area of the pivot lever 77; around the threaded bolt 82, slidably arranged on the intermediate bottom 69 sliding block 83 is connected with its pivot point 84 with the pivot lever 77 and limits the set height of the pivot lever 77 and thus the pressure finger 76. This pivot point is adjustable in an elongated hole 77 a and can thus achieve any desired lifting height.

The cam disk 80 is driven by a continuously variable geared motor 85 arranged inside the machine frame 10 , which drives a gear 87 through a chain 86 or the like (cf. FIG. 3). This gear 87 in turn drives from its driven chain wheel 87 a by means of chain 88 the drive wheel 89 of the cam disk 80 , which in turn drives a bracket 90 a provided in a front side of the machine by means of chain 91, the chain wheel 90 of the transport chain 12 , so that a constant Drive of the cam 80 and transport chain 12 is given.

An intermittent external star gear 92 is connected in line with the transmission 87, the drive pulley 93 of which actuates two vertically arranged pivot arms 96 with their fixed pivot point 95 on the machine frame 10 via a linkage 94. The upper end of these pivot arms 96 is each articulated to a drive 97 a, 97 b of the slide bearings 20 a, 20 b running on the guide axes 19 a, 19 b , so that when the pivot arms 96 pivot, the slide bearings 20 a, 20 b on the Guide axes 19 a, 19 b are moved back and forth. This movement of the slide bearings 20 a, 20 b simultaneously causes a movement of the screen 30 attached to it for printing on the body 56. During this movement of the screen 30, the body to be printed is rolled under the screen surface. After the end of a printing process, the screen slide stops for a short moment due to the external star gear 92 in order to take over the printing material in the rest position.

The receiving devices 50, 55 of the body are through the in the Rack 49 engaging gear 48 moves, the working path of the rack is dimensioned so that the part-circular path of the body 56 to be printed Area corresponds to. The linkage 52 transmits the movement of the receiving sleeve 50 from Gear 48 from on the eccentrically mounted receiving device 55, whereby always a constant and simultaneous pivoting movement of the receiving devices 50, 55 is guaranteed.

The above-described machine for continuous printing of bodies with oval cross-section, in particular bottles or the like, works as follows: The bodies to be printed, in particular bottles 56, are pushed in the direction of the arrows by the push angles 14 of the transport chain 12 on the slide rails 15 a, 15 b "A" moved and guided between the baffles 16 a, 16 b until they hit about the middle of the receiving devices 50, 55 against an upwardly bent overrun plate 98 which is adjustable in its angular position and are brought into the printing position. The support arm 75 with its fork-like pressure fingers 76, which are moved upwards by the cam disk 80 when the bodies 56 strike the run-up plate 98 and grip under the bodies 56, is located below this run-up plate 98. The bodies moved upwards hit the counter holder 102, as a result of which they are elastically braked and thus come to rest. This lifting movement of the pressure fingers 76 is achieved in that the drive of the transport chain 12 and the drive of the lifting device for the pressure fingers 76 are synchronized, so that the geared motor 85 via a gear 87 moves both devices simultaneously and uniformly. The movement of the transport chain 12 is switched so that when a body 56 hits the run-up plate 98, the cam disk 80 has brought the pivot lever 77 with its rear part into the uppermost position and thus also the pressure fingers 76 linked to it into the uppermost position Pressure fingers 76 grip under the body 56 and have lifted it off the transport chain 12, which continues without interruption. The pressure fingers 76 located in the uppermost position give (see FIG. F ig. 2) to be printed on the body 56 in the receiving devices 50, 55, by the receiving device 55 with its means of pressure medium cylinders 55 a controlled pressure sleeve 55 b a part, for example the neck of a Body 56, for example a bottle, and presses the body 56 with its bottom against the spring-loaded receiving sleeve 50, so that this hangs clamped at the front under the sieve 30. After the body 56 has been clamped, the geared motor 85 sets the swivel arms 96 in motion via the drive pulley 93 through the linkage 94, which move the support frame 23 with the lower sieve 30 back and forth via the drives 97 a, 97 b, the sieve 30 moving is always during the clamping of a body 56 over the surface to be printed. With the movement of the screen 30 in one direction (see arrow direction B in FIG. 1), the toothed rack 49 of the sliding axial bearing 20a sets the toothed wheel 48 of the receiving sleeve 50 in a pitch circle movement corresponding to the surface to be printed, which makes the printing process causes the body 56 to roll with its surfaces to be printed with the moving screen 30. This is ensured by the coupled receiving devices 50, 55, since the receiving sleeve 50 is rigidly attached to the gearwheel 48 and thus executes the movement with the body 56. In order to achieve a good print image, the speeds of the screen 30 and of the body 56 are the same, so that the contact of the screen 30 with the body 56 only ever takes place on one line. The actual printing process begins when the receiving devices 50, 55 strike an arc with the screen 30 which corresponds to the development radius of the body 56 to be printed. This circular movement is approximately a quarter of a circle, namely approximately 90 °, the start and end positions of the screen 30 each being below approximately 45 °.

During this printing process, due to the shape of the cam disk 80, the pressure fingers have returned to their lower position in order to receive the following bodies. After the body 56 has been printed on its outer surface, it falls in the most extended position of the screen 30 from the receiving devices 50, 55 onto a curved sliding plate 99 designed as a collecting plate or finger, and slides over this onto the slide rails 15 a, 15 b back and is transported away by the same, the body 56 to the receiving devices 50, 55 promoted thrust angle 14 of the transport chain 12, again on the slide rails 15 a, 15 b. The support frame 23 with screen 30 moves after the printing process with receiving devices 50, 55 in the direction of arrow C back into the starting position, so that the work process can take place again. During the movement of the screen 30 in the direction of arrow B, the doctor blade 36 maintains its position in the screen 30 and distributes the ink evenly over the entire printing surface.

The machine described above operates continuously, i. i.e., the pass A body takes place without the slightest interruption as the movements of each Devices for printing are coordinated and thus a work process intervenes in the following. This continuous passage of the body 56 prevents a delay and thus saves a large one, due to the previous one intermittent (cyclical) workflow. This is it is possible to significantly increase the performance of such machines.

Claims (1)

Claims: 1. Device for printing hollow bodies with variable oval cross-section in the direction of their longitudinal axis according to the screen printing process with arranged below the flat printing screen, moving on a partial circular path arrangements for clamping and actuations for raising and lowering the hollow body, characterized in that in the Conveying path of a conveying device (12 to 14) that continuously feeds the hollow bodies (56) to be printed and continuously transfers the printed hollow bodies on, engaging receptacles (98) for tilting the hollow bodies with respect to their longitudinal axis for the printing process and carriers (74 to 76) for lifting the are provided for lifting the inclined hollow bodies into the clamping area of the arrangements (50, 55) , the arrangements being able to be moved back and forth on the partial circular path. 2. Apparatus according to claim 1, characterized in that the receptacles (98) for aligning the hollow body (56) are designed as a ramp plate or ramp finger. 3. Apparatus according to claim 1 or 2, characterized in that the carriers (74 to 76) are arranged vertically displaceable below and in the region of the conveyor device (12 to 14). 4. Device according to claims 1 to 3, characterized in that the carriers (74 to 76) have at least one, preferably two or more, the shape of the hollow body (56) correspondingly curved pressure finger, lever or fork. 5. Device according to claims 1 to 4, characterized in that the pressure fingers, levers or forks (76) are interchangeable and the receptacles (98) are arranged to be changeable in their position (inclination). 6. Device according to claims 1 to 5, characterized in that below the sieve (30) or sieve carriage and above the lifting device formed by the carrier (74 to 76) a hollow body (56) which moves upward, preferably an elastically intercepting counter-holder or a Braking device (102) is provided. 7. Device according to claims 1 to 6, characterized in that the clamping device carrying the arrangements (50, 55 ) is equipped below the screen (30) with two opposing, positively interconnected pressure levers (51, 53). B. Apparatus according to claims 1 to 7, characterized in that one of the assemblies (50) is attached to a rotating disc, such as a toothed wheel (48). 9. Device according to claims 1 to 8, characterized in that the toothed wheel (48) can be moved synchronously by a main drive device by means of a toothed rack (49). 10. Device according to claims 1 to 9, characterized in that the clamping device (50, 55) is followed by a collecting device consisting of a collecting plate or finger (99) for the ejected hollow body (56) in the region of the conveyor (12 to 14) is. 11. The device according to claim 1, characterized in that one or more chains (12) or belts equipped with drivers (14) rotate as a conveyor in the area of fixed slide rails (15 a, 15 b) serving as supports for the hollow bodies (56) . Documents considered: German Patent No. 539 773; German Auslegeschriften No. 1,064,533, 1068181st; French Patent No. 1265 209; USA. Patent Nos. 2 701545, 2951440, 2 971629, 2987992.