DE2136093B2 - Control device of an ink supply device for a rotary stencil printing machine - Google Patents

Description

The invention relates to a control device for an ink supply device for a rotary stencil printing machine with automatic sheet feed and with an ink distributor line that feeds the printing ink, which is connected to a paint pump, which via a pump mist and a transmission device can be actuated by the drive of the rotary stencil printing machine.

It is known to control the supply of ink as a function of the drive of the printing machine, so that after a certain number of movements of the printing machine the ink is supplied. One however, such control is disadvantageous in that ink is supplied even when there are no printed sheets be created. This leads to an unnecessary and disadvantageous excess of paint.

The invention is therefore based on the object of creating a control device for the ink supply of a rotary stencil printing machine with which over-inking is reliably prevented.
This object is achieved according to the invention

iö solves that the transmission device one with the Pump lever which can be brought into and out of engagement tow hook, which by a scanning device for fed sheets and depending on the stack height via locking lever for an actuation

movement of the pump lever can be released.

The advantages achieved with the invention are in particular in that one has an extremely reliable ink supply device despite its simple construction that automatically feeds the ink depending on

speed of the upward movement of the sheet tray controls, the decreasing during duplication Color supply is replenished by supplying the required Far ^ amounts without in addition devices for counting the supplied

»5 sheets of paper or to trigger the start of the ink feed are required.

In addition, the unnecessary and undesirable ink supply to the printing cylinder is in the lower end position the sheet feed roller when on the

There are no more copy sheets on the stacking table, or if the stacking table with the ones on it Copy sheets, e.g. B. by hand or automatically, is lowered. thereby preventing the printing cylinder due to the control of the ink supply only

then the required amount of ink is supplied when sheets are also delivered. It will in other words, ink is only supplied when the ink supply is running out and at the same time the sheet continues to be delivered. As long as the two pressure cylinders

run empty and the sheet feed roller is in the lower end position because the one on the stacking table If the stack of sheets located does not reach a predetermined height, the ink feeder is turned off not put into operation, so that the supply of

can prevent excess ink to the printing cylinder.

Further details of the invention will become apparent from the following description of an exemplary embodiment, with reference to the drawing is taken. It shows

F i g. 1 is a side view of an ink supply device;

Figures 2 and 3 are side views of the sheet feeder;

F i g. 4 is a side view of the position of the ink supply device; if no copy sheets are fed,

F i g. Fig. 5 is a side view showing the position of the ink feeder during the feeding of copy sheets and the indication that the supply of ink is running out, and

F i g. 6 to 8 show the operation of the ink supply device.

In the in F i g. 1, a rotary stencil printing machine is wrapped around an endless belt 3 fine-meshed screen material two stencil drums 1 and 2. On the belt 3 is a (not shown) Attach the template or print-through

stigt. The two stencil drums 1 and 2 are on shafts 4 held with their two ends in the two side walls 6 of the printing press or 5 rotatably arranged counterclockwise, so that the endless belt 3 also counterclockwise running around.

On the shafts 7 and 8 mounted in the side walls 6 inking rollers 9 and Ll are in contact with the circumferential surfaces of the stencils 1 and 2. Parallel to the circumferential surface of the stencil drum 1, there is an ink distributor line 12 with a number of small bores 12 α . The paint pump line 12 is connected to a paint pump 13 fastened to the side wall 6 at the top left. The paint pump is used to supply the required amounts of paint to the stencil drum 1

13 can be actuated manually or automatically in the manner described below. Mounted on the shaft 4 of the stencil drum 1 is a cam disk 14 which can be driven by means of gear devices (not shown) counter to the direction of rotation of the stencil drum 1, that is to say clockwise. The cam plate 14 has an outer peripheral surface

14 α, on which a roller 16 mounted on a rocker arm 15 is held in contact with pressure. The rocker arm 15 is pivotable with its foot part on a fixed to the side wall6 and a V-shaped lever 16 rigidly supporting axis 17 mounted.

A tension spring 19 anchored at one end to a pin 18 α on a lever 18 and at the other end to the side wall 6 load the lever 18 in a clockwise direction through its tension. A screw 21 screwed into an angled part 18 b of the lever 18 is held in contact with the lower edge of the rocker arm 15 under pressure via the load by the spring 19, so that it is also loaded clockwise about the axis 17.

On the axis 17, two support arms 22 are also attached with their foot parts. At their free ends are the journals of a pressure roller in them

23 rotatably mounted for pressing a sheet onto the stencil drum 1. Since the support arms 22 are rigidly connected to the lever 18 via the axis 17, the pressure roller 23 is also due to the tension the spring 19 is loaded in a clockwise direction about the axis 17.

At its left, free end of the rocker arm 15 is provided with a projection 15 α on which one from the shorter lever arm of a scanning lever

24 angled part 24 a is in the system (Fig. 4). Furthermore, the rocker arm 15 has a stepped edge 15 b on its free surface, on which the longer arm of the scanning lever 24 is in contact with its free end 24 b .

The scanning lever 24 is pivotably mounted on the side wall 6 by means of an axis and by means of a tension spring 26 of relatively low tension, which with one end on the scanning lever and is anchored to the other on the side wall 6, loaded counterclockwise. On the short Arm of the scanning lever 24, an arc sensor 27 is attached to its foot part in such a way that its free end protrudes between two guide plates 28 and 29 for the sheet (Fig.2). When passing an arch between the baffles 28 and 29, the free end 27 α of the sheet sensor 27 is clockwise the axis 25 pivoted.

The sheets are stacked one on top of the other Arch formed sheet supply 32 delivered.

An actuating lever 55 is attached to the axle 36 holding the support arms 35 (FIGS. 2, 3). At its lower edge, a part 55 α is angled. An angled part 57 a of a pressure lever 57 rests on a screw 56 screwed therein. The pressure lever 57 is arranged on an axle 58 mounted on the side wall 6 ίο. A first locking lever 59 is also mounted with its foot part on the axis 58. A tension spring 61 is anchored with one end on a projection 59 α of the first locking lever 59 and with the other on the right end of the pressure lever 57. Another angled part 57 b of the pressure lever 57 is held by the tension of the spring 61 under pressure in contact with an upper edge of the first locking lever 59.

A drive lever 62 is mounted on an ao axis 63 arranged on the side wall 6. A hook 59 b formed on the first locking lever 59 engages a part 62 a angled thereon. The drive lever 62 is at one end to which an arm 62 b of the "5 the lever 62 and is anchored to the other of the side plate 6, stressed by the tension of a tension spring 64 in the counterclockwise direction. A roller 65 mounted on the right end of the drive lever 62 is held by the load from the spring 64 under pressure in contact with a cam disk 51 for the sheet feed.

A pawl 66 is mounted on arm 62 b of the drive lever 62 by means of a pivot pin 67 and is loaded in the clockwise direction by a spring (not shown). The switching pawl 66 is in engagement with a switching wheel 68 which is mounted on an axis 69 on the side wall 6 and which is prevented from rotating in the counterclockwise direction by a pawl 71 in engagement therewith. During the operation explained below, the drive lever 62 executes pivoting movements about the axis 63. As a result of these pivoting movements, the pawl 66 advances the ratchet wheel 68 step-by-step in a clockwise direction. The sheet supply 32 can be raised both manually and automatically via the ratchet 68.

A display lever 72 for the ink supply is arranged on the axle carrying the drive lever 62 (FIGS. 1 and 3). At its free end sits a pin 72 α, on which a side edge 74 α of a second locking lever 74 rests under pressure. The second locking lever 74 is mounted on the side wall 6 via an axis 73 (FIG. 1). The second locking lever 74 is loaded in the counterclockwise direction by a tension spring 75 anchored with one end on the side wall 6 and with the other on the lever 74. At one end it has a step 74 b with which an angled part 76 α of a release lever 76 can be brought into engagement.

The release lever 76 sits on an attached to the side wall 6 60 axis 77 and is through the One end of the tension is anchored to the side wall 6 and the other to the lever 76 Tension spring 78 is loaded counterclockwise about axis 77. The release lever 76 is located 65 with an arm 76 c in contact with a roller on the rocker arm 15 superimposed axis 79 so that the Release lever 76 follows a movement of rocker arm 15 about its axis 17. In the normal state is

the release lever 76 is prevented from moving by the locking lever 74.

A tow hook 81 is articulated with its foot part on a second arm 76 b of the release lever 76 by means of a pin 82. The tow hook »1 has a short arm 81 α , protruding to the left, with the lower edge of which it is supported on a stop 83 α attached to a regulating lever 83 for the paint supply that is pivotably arranged on the axis 77.

With the aid of the control lever 83, the setting of the ink supply, for example, can b on a segment 83 by a scale 84 with a window 85 are displayed. Furthermore, the regulating lever 83 can be locked in the selected setting.

One end of a tension spring 91 is anchored to the tow hook 81 and the other to a pump lever 89. The pump lever 89 is pivotably mounted on the side wall 6 by means of an axis 88. Due to the tension of the spring 91, the tow hook 81 is loaded counterclockwise around the pin 82, but due to the abutment of the short arm 81 α on the stop 83 α of the regulating lever 83 for the paint supply in the manner shown in FIG. 1 held position shown.

A pin 89 α for engaging the hook part 81 b of the tow hook 81 is attached to the pump lever 89. During a pivoting movement of the tow hook 81 together with its pivot pin 82 about the axis 77, it exerts a tensile force on the pin 89 α and thus pivots the pump lever 89 clockwise about the axis 88.

On the back of the pump lever 89, a roller 90 is mounted on a pin, which between on the piston rod 92 of the paint pump 13 arranged flanges 92 a, 92 ft is loosely guided. During the pivoting movement of the pump lever 89 about its axis 88, the piston rod 92 leads horizontally reciprocating motion, the first being the outer surface of the stencil drum 1 arranged distribution line 12 is supplied by the pump 13 paint.

In Fig. 3 there is a locking part 93 in engagement with one at the free end of the pivot lever 44 formed stage 44 α to this and a rigidly connected segment gear lever 48 on a To prevent pivoting movement. With the beginning of the feeding of individual sheets by the sheet feeding device reduces the force with which the locking part 93 at the step 44 a of the pivot lever 44 engages so that the sector gear lever 48 is unlocked.

When the cam disk 14 is rotated clockwise, the roller 16 arranged on the rocker arm 15 rolls over a protruding elevation 14 c. As a result, the rocker arm moves from the solid line to the one shown in FIG. 4 position shown in dot-dash lines. The angled part 24 a of the scanning lever 24 is shifted slightly downwards by the projection 15 α , at the same time the relatively large force with which the free end 24 & of the scanning lever 24 is held in engagement with the step 15 b of the rocker arm 15, decreased.

When the force holding the scanning lever 24 in engagement with the rocker arm 15 is reduced, it is pivoted the leading edge of a sheet fed by a roller 33 reaches the sheet sensor 27 of the scanning lever 24 against the load by the tension spring 26 downwards. As a result, the scanning lever 24 moves in the Clockwise about axis 25 with its free end 24 ft out of engagement with step 15 ft am Rocker arm 15 comes and thus the rocker arm 15 releases.

When the cam disk 51 for the sheet feed is turned further (clockwise), one runs on the toothed segment lever 48 mounted roller 49 on the outer sector 51 ft of the cam and pivoted in the process the sector gear lever 48 counterclockwise back to the starting position. The swing back of the toothed segment lever 48 causes the drive via a pinion 49 a and an overrunning clutch 50 a pair of conveyor rollers 53/54 clockwise or counterclockwise and thus the feed a sheet to the stencil drum 1.

In the meantime, when the cam disc 14 is rotated clockwise, the roller 16 of the drag lever 15 reaches a sector 14 ft with a smaller radius of the cam disc, the support arm 22 rigidly connected to the lever 18 being moved into the position shown in FIG. 5 position shown is pivoted. As a result, the pressure roller 23 presses the sheet brought in by the conveyor rollers 53, 54 against a stencil or die (not shown) attached to the endless screen belt 3. The sheet is printed as long as the roller 16 of the rocker arm 15 is on the sector 14 b with the smaller radius of the cam disk 14. After completion of the printing process, the roller 16 runs again on the outer Verweüfläche 14 a and pivoted the rocker arm 15 in the counterclockwise direction. As a result, the pressure roller 23 is lifted from the stencil drum 1 and returned to the position shown in Fig. 1. The pivoting of the pressure roller 23 about the axis 17 and in contact with the stencil drum 1 takes place each time a sheet is fed in and is repeated until completion the sheet feed is interrupted during copying.

In the course of the work, the amount of paint present on the stencil drums 1 and 2 is reduced and must therefore be refilled. It is now reduced in the case of the one shown in FIG. 2 shows the number of sheets in the sheet supply 32, the sheet feed roller 33 moves downwards, whereby the support arms 35 holding it are pivoted a small amount in the counterclockwise direction about the axis 36. The actuating lever 55, which is essentially rigidly connected to the support arms 35, also counterclockwise and guides the pressure lever 57 counterclockwise with the tension spring 61. After about 10 sheets have been fed in and the sheet supply 32 has been removed, the first locking lever 59 swivels counterclockwise Such a pivoting movement occurs as soon as the force with which the angled part 62 a of the drive lever 62 is held in contact with the hook 59 ft of the locking lever 59 decreases, ie as soon as the roller 6! On the drive lever 62 hits the projection 51c de cam disk 51 runs up and the drive lever 6 is pivoted a small amount in the clockwise direction. As a result, the is angled Elte part 62 a in contact with the hook 59 ft holding tension of the tension spring 64 is canceled, and the first locking lever 5! pivots under the action of the spring 61 in the opposite direction

Clockwise to release drive lever 62.

When the drive lever 62 pivots in the counterclockwise direction, the indicator lever 72 rigidly connected to it also pivots in a counterclockwise direction. Shortly before the onset of this pivoting movement, the roller 16 of the rocker arm 15 runs with an outward movement onto the projection 14 c of the cam disk 14, so that the release lever 76 pivots a small amount about the axis 77 in a clockwise direction. This creates a gap between the step 74 b of the second locking lever 74 and the part 76 a angled at the release lever 76, and the mutual contact pressure is reduced.

When the ink supply indicator lever 72 pivots in this state, while the second locking lever 74 is pivoted clockwise about the axis 73 against the tension of the spring 75.

By moving the ink supply indicator lever 72 and the second locking lever 74 out of their The release lever 76 is unlocked in the position shown in solid lines in the position shown in dash-dotted lines (Fig. 6). It can therefore pivot clockwise the next time a sheet is fed in Follow the rocker arm 15 under the force of the tension spring 78, where it swivels in the Counterclockwise. As a result of these swiveling movements, the tow hook 81 performs a complex movement consisting of pivoting movements about axes 77 and 82 and linear Movements composed. The amount of paint supplied depends on the type of these movements. The release lever 76 remains unactuated despite the actuation of the indicator lever 72 as long as none Sheet feed takes place because the rocker arm 15 is blocked by the scanning lever 24 (FIG. 4). In this Case, the release lever 76 only moves between the lines shown in Figure 4 and dashed-dotted lines Drawn positions, so that when the cam disk 14 is rotated, no paint is supplied. So if after placing a sheet supply 32 it is moved upwards automatically or by hand, so the stencil drum 1 becomes none in spite of the actuation of the indicator lever 72 which occurs at the same time Color fed.

Pivots the trigger lever 76 in corresponding Fig. 1, in the zero position befindlichem control lever 83 counterclockwise, so it performs the b articulated with his foot at the free end of the lever arm 76 tow hook 81 in its pivoting movement about the axis 77 with. Since the tow hook 81 itself is movable with respect to the release lever 76, it pivots counterclockwise about the axis 82 under the action of the spring 91. The size of the pivoting movement of the tow hook 81 with respect to the release lever 76 is determined from the position of the stop 83 a of the regulating lever 83 and from the angle of the movement about the axis 77 carried out by the axis 82 holding the tow hook 81. When the regulating lever 83 is moved clockwise, the angle through which the towing hook 81 is pivoted during the movements of the release lever 76 increases accordingly. Thus, the tow hook 81 executes a guided movement about the axis 77 and a proper movement about the axis 82 through the pivoting movement of the release lever 76. The movements of the tow hook 81 are thus composed of a movement about the axis 77 and a proper movement about the axis 82 during the pivoting movement of the release lever 76.

If the release lever 76 performs its movement following the axis 79 from the movement shown in FIG. 6 and the position shown in dotted lines, as long as the regulating lever 83 is in its zero position, the tow hook 81 moves in the complex movement described above from the extended position to the dot-dashed position 81 α, with its hook part 81 £ > hooks onto pin 89 a of pump lever 89 without moving it. If the release lever 76 and the tow hook are pivoted back from this state into the drawn position, the hook 81 b does not carry the pin 89 α of the pump lever 89 with it, but releases it again so that the pump lever 89 does not move about the axis 88 executes. During these processes, the short arm 81 α of the tow hook 81 is constantly with its lower edge by the tension of the spring 91 in

»5 System at the stop 83 α of the regulating lever 83 held.

As already mentioned, the pivoting of the pump lever 89 causes a rectilinear movement of the piston rod 92 of the paint pump 13 and thus a paint supply to the distributor line 12 (FIG. 1). The pump lever 89 is actuated either manually by means of a handle 89 b or automatically by means of the tow hook 81.

As long as the regulating lever 83 is set to zero, the hook part 81 b of the drag hook 81 cannot grip the pin 89 a on the pump lever 89, so that it is not actuated despite the pivoting movement of the drag hook 81 and, accordingly, no paint is supplied to the scraper drum 1.

If you pivot the regulating lever 83 clockwise, z. B. to any setting of its scale 84, the tow hook 81 follows the movement of the stop 83 a in a counterclockwise pivoting movement about the axis 82. This shortens the distance between the hook part 81 b of the tow hook 81 and the axis 77 by a low level. If the indicator lever 72 actuates the paint supply in this state, so that the release lever 76 is pivoted counterclockwise, the tow hook 81 comes in its complex movement with the front edge 81 c of the hook part 81 b in contact with the pin 89 α and is therefore able to reverse its pivoting movement the axis 82 cannot be carried out. During the further pivoting movement of the release lever 76 about the axis 77, it therefore moves in a straight line upwards to the left, whereby in addition to the guided movement about the axis 77, it initially executes a counterclockwise pivoting movement about its axis 82 until the front edge 81c on the pin 89 α comes into contact and prevents further pivoting movement. This is followed by the linear movement to the left upwards, the tow hook 81 executing a slight pivoting movement in the clockwise direction about the axis 82 until the Hakcnisil 81 b hooks on the pin 89 α.

As already mentioned, the ratio of the guided movement of the tow hook 81 is about the axis 77 and the proper movement around the axis 82 to the ee

409510/70

9 10

straight-line movement through the position of the regulating stop 83 a of the regulating lever 83

lierhebels 83 determined. In the case of a low-numbered men.

Adjustment of the regulating lever 83 are the pivoting axis movements of the drag hook 81 relative to the Ii- 79 of the roller 16 when rolling over the frontal movement, while with a 5 jump 14 α on the cam disk 14 the movement shown in F i g. 8 higher-numbered setting of the regulating lever 83, position B , shown in dash-dotted lines, and pivoting are relatively large. while the release lever 76 continues clockwise

F i g. 7 shows the regulating lever 83 from the top to the one in FIG. 7 drawn position. Setting its scale 84. During the movement of the Since the short arm 81 α of the tow hook release lever 76 moves from the solid drawn in io 81 with its lower edge under pressure in contact with the dot-dashed position, the stop 83 a of the regulating lever 83 is located The tow hook 81 is essentially linear until the tow hook 81 can not continue its linear movement on the Haken'pil 81 b, as shown in dash-dotted lines, but is hooked against the BeIa pin 89 a of the pump lever 89. When the spring 91 is operated in a clockwise direction about the near movement of the tow hook 81, the axis 82 is pivoted between 15. Due to this Schwenkbeschen the lower edge of his short arm 81 α and movement of the tow hook 81 is the pin 89 a of the control lever 83 inevitably hooked on the pin 89 a of the pump lever 89 hook part 81 b dieein gap, the width of the amount of paint supplied sen free, so that the pump lever 89 under the will is directly proportional. In addition, the width of the kung of the spring 91 is in the manner shown in FIG. 7 is obviously proportional to the setting of the 20 gear position.

Regulating lever 83. When adjusting the regulating lever, In F i g. 7 and 8 is the color control lever

bels 83 to zero takes place between the arm 81 α and at 83 in its upper setting, μ that the

the pin 83 a only a slight shifting tow hook 81 during the pivoting movement of the

Exercise when mutual pressure is loaded instead of release lever 76 long-stroke straight movements

(Fig. 6). 25 executes. In the positions shown, the

As soon as the roller 16 of the rocker arm 15 of the see the short arm 81 α and the stop 83 a inner dwell surface 14 b of the cam disk 14 on the gap formed, therefore, its greatest width, so that the outer dwell surface 14 o comes, so that the pump lever 89 , which is swiveled so far. Axis 79 from the dash-dotted line in FIG. 7 until the short arm 81α comes to the stop 83a in anneth in the position shown in solid lines, the supply of a relatively large amount of paint is effected, the release lever 76 pivots against the amount.

Load by the tension spring 78 in the clockwise direction; ·: ".. If the reverse lever 83 is reduced from the position shown in FIG the width of 89 α and moves it out of the dash-dotted line 35 when hooking the hook part 81 b of the towing drawing into the drawn position kens 81 on the pin 89 α between the short arm 81 a (FIG. 8) The pump lever 89 is in the gap formed by the clock and the stop 83 α . Therefore, it is pivoted in a clockwise direction about the axis 88, the short arm 81 α coming to the stop 83 α in the piston rod 92 of the paint pump 13 lying horizontally before the tow hook 81 pulls out the pump lever so that the paint distributor line 12 has automatically 40 89 brought a certain amount of paint into the position shown in FIG The amount of paint supplied to the distribution line 12 passes through the pump lever 89 and thus the stroke of the paint through the bores 1? - α formed therein onto the pump 13 from the position of the regulating lever 83. The surface of the stencil drum 1. depends. So it is possible, by setting the

In the one shown in FIG. 8 moves 45 color protruding from the outside of the printing machine

the tow hook 81 straight down to the right. regulating lever 83 by hand the point at which the

The release lever 76 has been derived from the dash-dotted line with the pivotably driven release lever 76

The tow hook 81 shown in the drawing, connected to the position shown in solid lines, connects the pump lever 89

the pump lever 89 from the one shown in FIG. 7 engages or releases to determine and thus the

the in F i g. 8 position shown moved. In this case, the amount of paint supplied to the stencil drum 1 is up

short arm 81 α of the tow hook 81 in a simple manner to regulate.

For this purpose 2 sheets of drawings

BI? ⁸⁶⁵ P

Claims (3)

Patent claims: 1. Control device of an ink supply device for a rotary stencil printing machine with automatic sheet feed and with an ink distributor line that feeds the printing ink, which is connected to a paint pump, which via a pump lever and a transmission device can be actuated by the drive of the rotary stencil printing machine, thereby characterized in that the transmission device (14, 15, 74, 76, 77, 78, 81) with a the pump lever (89) in and out of engagement tow hooks (81) which by a scanning device (24, 27) for supplied sheets and depending on the stack height can be released via locking levers (59, 74) for actuation of the pump lever (89). 2. Control device according to claim I, characterized in that the transmission device (14, 15, 74, 76, 77, 78, 81) for the tow hook (81) one that can be driven by a stencil drum (1) Cam disc (14), a rocker arm pivotable by means of the cam disc (14) (15), a triggering lever which can be pivoted about an axis (77) as a function of the rocker arm (15) (76) and one the pivoting movement of the release lever (76) when the sheet supply is removed (32) has a certain amount releasing locking lever (74) that the tow hook (81) pivotally mounted on the release lever (76) and by the tension of a spring (91) is loaded in a direction bringing it into engagement with the pump lever (89) and that the pivoting movement of the towing hook (81) can be limited by a stop (83 o), so that the tow hook (81) during the pivoting movement of the release lever (76) both around its Axis (77) as well as about its own articulation (82) movable and thus in engagement with the pump lever (89) can be brought. 3 control device according to claim 2, characterized in that the swivel angle range of the tow hook (81) opposite the release lever (76) by changing the position of the stop (83 a) can be changed from outside the rotary stencil printing machine.