JPH03500271A - Method and apparatus for monitoring the ejection of ink droplets from the discharge nozzle of an ink recording head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The nozzle of the print head Vinegar for ink.

The present invention relates to a discharge nozzle of an ink recording head according to the generic concept of claim 1. A method for monitoring the extrusion of ink droplets and an apparatus for carrying out this method.

The representation of a symbol or graphic pattern by an ink recording device consists of individual ink drops. is extruded from the ink recording head's ejection nozzle in a controlled manner. I'm there. Such devices are drop-on-demand (Drop-on-Demand) nd) (D　OD　) type device.

In this way, the symbol is lost due to the relative movement between the record carrier and the ink recording head. or a graphic pattern is placed on the record carrier in raster form in the form of a large number of single points. It is formed. Therefore, it is called the so-called matrix expression or matrix printing method. Ru. The quality of the records formed in this way is the so-called character quality (Schriftqua (literaet) depends substantially on the number of drops forming a character. in this way For example, an engine with a large number of discharge openings or nozzles arranged in a large number of rows A digital recording head was developed. This allows individual drops to be deposited on the record carrier. , these droplets overlap and appear optically continuous both vertically and horizontally. For example, electrically controllable piezoelectric elements are used to form a line at each discharge nozzle. Type-specific drive elements are correspondingly provided. This driving element Matched operating characteristics are provided for trouble-free operation in cooperation with the channel and ink supply channel. Must have. Each of these single systems is approximately 4kHz? W repeat Operates at return frequency.

Ink recording devices have been used almost constantly for several years, and the discharge nozzle has a diameter of 100 μm. Considering also that it has a diameter smaller than m, the importance of monitoring for full operational capability I understand the importance. In particular, external influences such as dust, fine paper waste, dry ink or Even if gas or air gets into the ink channel, the discharge nozzle will malfunction. This results in a deterioration in character quality. Therefore, such faults can be detected early during operation. It is of great interest to detect and address this early.

In general, the correct operation of the recording head is determined by the user's own visual inspection of the special print pattern. Tested using tests.

This is not trivial and is due to the relatively small droplet diameter, which is on the order of about 60 μm. It requires very difficult observation and often requires a loupe for this purpose. especially each other It would be impossible to see with the naked eye if two discharge nozzles located apart from each other failed.

Overall, these tests are not satisfactory.

It is already known to detect this type of operational failure using an ink droplet sensor. (West German Patent Application No. 3310365) 9 In this case, the A capture electrode is provided and the ink droplet is charged during its movement towards the capture pole. . When a charged ink droplet hits a capture electrode, an electrical signal is formed; The signals can be evaluated as measurement and transmission signals for disturbances.

This known method uses a relatively high voltage (up to 300 V) to charge the ink droplets. Requires special electrodes to which pressure must be applied. This results in additional fabrication Not only is it costly, but because the voltage is high, It is also necessary to provide protective measures.

The problem of the present invention is to improve the operation of an ink recording head having a large number of ejection nozzles. By detecting drop hits, it is possible to detect without visual inspection of the printed pattern. to confirm measurement results without additional protective measures and at low circuit engineering costs. It allows for accurate and unambiguous evaluation, and requires only relatively simple configuration means. In particular, sensor plate fabrication, ink drop sensor assembly and ink recording head This not only improves integration into the software, but also allows testing and testing during the manufacturing process. The use as a test and inspection device, for example as a guarantee device, is advantageously improved.

The second problem is solved by the means described in the characteristic part of the claim. Other implementation Examples are given in the other claims.

Figure 1 is a principle diagram for explaining the present invention, Figures 2 and 3 are ink droplets, respectively. A plan view or a cross-sectional view showing one embodiment of a comb-shaped electrode provided as a sensor. , FIG. 4 is a plan view showing a second embodiment of the comb-shaped electrode, FIGS. 5, 6, and 7. are circuit diagrams or block circuit diagrams showing examples of evaluation circuits, and Figure 8 is a sensor block diagram. A plan view and a sectional view showing an example of the sensor device, and FIGS. 9 and 10 respectively show the sensor equipment. FIG. 2 is a plan view and a sectional view of an example of the device actually used.

Example In FIG. 1, a known ink recording head 1 is shown on the right side. In this example, the nozzle plate 2 has nine discharge nozzles 3. a head member 4 having ink channels 5 and correspondingly arranged ink channels 5; The ink supply section 7 includes a drive element 6 and an ink supply section 7. The ink supply section 7 is an ink supply pipe 8 It is connected to an ink storage container (not shown) via. drive element 6 Separately controlled individual ink drops from correspondingly arranged nozzles 3 9 is extruded. The nozzle 3 shown in the sectional view of FIG. They can also be arranged in multiple columns. Therefore, 4 such columns are 32 It is also possible to form one recording head with nozzles, with individual rows of nozzles Zules can be arranged offset from each other. The ink droplet sensor of the present invention This ink drop sensor, which is arranged at a distance 10 with respect to the head 1, mainly As a comb-shaped electrode with two electrode terminals 13 and 14 led out to the outside. sensor plate 12 formed, and arranged behind or below these Hereinafter, it will be referred to as the suction block 17 and will be used for receiving and discharging liquid. Consists of layers. The comb-shaped electrodes are designed to absorb ink at least in the area of the ink droplet's impact point. It has a number of conductor tracks 18, 19 running parallel to each other in the area of impact of the drop.

A device for discharging the liquid supplied by the impact of an ink drop is made from a non-conductive porous material. Become. The device may be formed from one layer or advantageously from several sublayers. be. 1! The pole terminals 13 and 14 are connected to an evaluation circuit 20, which As will be explained below, depending on the impact of one or more ink droplets on the comb-shaped electrode 12, Then, a corresponding signal, that is, a sensor signal SM is sent out.

The operation of the method of the invention and the advantageous apparatus for carrying out the method will now be described in FIGS. 2 and 3. This will be explained with reference to the figures. FIG. 2 shows one of the comb-shaped electrodes 12 of the ink droplet sensor. FIG. 3 is a plan view showing the embodiment, and FIG. 3 is a sectional view of the embodiment. In this example , the comb-shaped electrode is formed by two comb parts 121 and 122, and the conductor track 18 and The comb portions 121 and 122 with the comb portions 19 and 19 here consist of a non-conductive porous layer. It is mounted on the suction block 17. These comb parts 121 and 12 2 are electrically connected to each other from the outside via electrode terminals 13 and 14. Can be done.

FIG. 3 shows a detailed cross-sectional structure. For example, the suction block 17 has a suction ability. two partial layers 15 and 1 of material with thicknesses Sl and S2, respectively; Consists of 6. The uppermost partial layer includes an insulating sheet 21 whose upper side is coated with a gold layer. A shaped insulating layer is applied, and then the insulating sheet 21 is applied with a pitch T of the comb-shaped electrodes. The conductor tracks 18 and 19 are provided. As a result, Figures 2 and 3 The structure shown in is formed. Comb part 121 with conductor tracks 18 and 19 ．． 122 has a height L. The conductor tracks 18 and 19 each have a width A and are spaced apart from each other. Run at a distance of B.

This determines the pitch T=A+B. The ink drop sensor is the only diameter If ink droplets are detected, an electrical resistance bridge between adjacent conductor tracks 18 and 19 is detected. In order to form an electrical resistance bridge between the comb portions 121 and 122, T≦D From the example in Figure 3, the ink drop 9 must be on the surface of the ink drop sensor. This condition is met when a hit occurs, and the resistance between adjacent conductor paths is therefore significantly reduced. However, this decrease in resistance at electrode terminals 13 and 14 can be evaluated by an evaluation circuit. I can do it. After the ink liquid 9 hits the upper porous partial layer 15, the ink liquid first hits the upper porous partial layer 15. The particles are sucked in by the particles, transported downward, and finally penetrate into the second partial layer 16. Enter. The non-conductive porous partial layers 15 and 16 are a kind of suction with capillary action. The efficiency of the suction pump acting as a pump depends on the selection of porosity and/or fraction. By selecting the number of layers or the thicknesses Sl, S2, they can be tailored to the specific application. No. The following dimensions have been found to be particularly advantageous for the embodiment shown in Figure 3: .

A=B=40μm H (gold electrode) = 16μm L=50μm S2=1.50111 2. The porosity of the two layers 15 and 16 P1 and P2 are different.The porosity of the two individual layers is It is advantageous to increase with increasing distance from the comb electrodes (P, 2>PI, 1. As a result, liquid transport advantageously takes place from the upper partial layer 15 to the lower partial layer 16. guaranteed. This causes ink to rapidly drain from the space near the comb-shaped electrode. It is possible to reliably detect single drops that are ejected and therefore arrive at short time intervals. It has the advantage of being possible. Individual partial layers 15 with different porosity and 16, advantageously a Duran film for the upper partial layer 15. Tagarasu has so-called millibore (Mi1lipo) in the lower partial layer 16. re) Filter vapor is suitable. In this case, the pores of the upper porous partial layer 15 The dimensions may be between 0.01 and 0.02, and the dimensions of the lower porous partial layer 16 may be between 0.01 and 0.02. The pore size may be between 0.005 and 0.01 mm. The comb structure mentioned above The structure can advantageously be manufactured using known thin-film or thick-film technology.

An ink liquid with a predetermined conductivity is applied to this comb-shaped structure. During this period, the electrical resistance of the conductor path between the two comb sections changes dramatically. two The ink liquid is removed by sucking the liquid into the layer by capillary action. Therefore, measurement is possible between the comb parts 121 and 122 that are not electrically connected to each other. resistance increases again over time and therefore the porosity PI, P2 of partial layers 15 and 16 After the suction time has elapsed, which depends on the characteristics of the ink and the Ink liquid extruded from another nozzle can be detected in a similar manner. . With the aforementioned dimension values, individual ink drops are detected at intervals of approximately 20 m5. be able to.

With the above-mentioned device in which the relationship T≦D is established between the pitch T and the diameter of the ink liquid, Even a single drop hit can be reliably measured. larger than the diameter of one single drop It is within the scope of the present invention to set a large pitch T (T≦D). This allows you to record Many single droplets are ejected sequentially at short time intervals from one nozzle of the recording head. It is possible to reliably detect the inside. That is, individual inks are applied to the comb-shaped electrodes. If the liquid hits within a certain amount of time, each newly hit drop will cause two adjacent conductors to The amount of liquid between the conductor paths is such that this amount of liquid forms an electrical connection between these two conductor paths. increases until In this way, it becomes noticeable only by the third arriving drop, for example. It is possible that a drastic resistance change will be initiated.

In this case, the porosity of the individual layers acts on the suction by capillary action of the ink liquid. It is also within the scope of the present technology to adjust accordingly. So actually above this is the case when the pitch is T)D and the suction block consists of many partial layers. The porosity of this partial layer increases from top to bottom as explained in connection with Figure 3. means selected to join.

In a second embodiment, the structure of the comb-shaped electrode device is arranged in a bifilar manner. This allows the conductor tracks of the comb structure to be controlled, e.g. The advantage is that they can be connected to each other during measurement pause periods. Regarding this One example is shown in FIG.

In FIG. 4, the conductor paths 181 and 191 of the two comb portions 123 and 124 are It is mounted on the suction block 17 in a meandering manner. This structure and conductor path 18 1 and 191 are configured as described in connection with FIG. same as before The conductor tracks run parallel to each other in the region of the impact point of the ink fluid. Implementation of the above Unlike the embodiment described here, the electrode terminals 13 and 13 are guided to the outside. In addition to 14, a second pair of electrode terminals 23 and 24 is provided. conductor tracks 181 and 191 can be electrically connected to each other via . over the duration of the measuring operation, i.e. over the period during which a hit of the ink liquid is detected. Electrode terminals 23 and 24 are not connected to each other. In this case, ink liquid hit is detected. The operations performed are as described with reference to FIGS. 2 and 3. That is, ink If no liquid is detected, the The electrode terminals 23 and 24 can then be connected to each other. This allows the illustrated conductor during the measurement pause period using a power supply connectable to electrode terminals 13 and 14. for heating the channels 181 and 191 and for evaporating the ink liquid. It is possible. This prevents evaporation from occurring in addition to the capillary action of the suction block. This provides the added benefit of liquid removal.

The life of the ink fluid with a sudden drop in resistance in the middle of the path of the conductor path of the comb-shaped electrode In order to evaluate the inside, a circuit device that sends out a sensor signal SM every time the ink liquid hits the It is provided. FIG. 5 shows an embodiment for this purpose. times shown in the diagram The path essentially consists of a fixed resistance 30 and a variable measuring resistance 31. changing measurements The resistor 31 is connected between the conductor tracks 18 and 19 of the comb-shaped electrode (FIG. 2) or between the conductor tracks 181 and 191 (Fig. 4), i.e. the circuit shown represents the actual resistance value in each case between At this point, the electrode terminals 13 and 14 of the comb-shaped electrode are connected. voltage divider The tap between resistors 30 and 31 is connected to the input side of comparator 32. this The connections are such that the voltage value Um to be regulated at the tap points of the voltage divider circuits 3o, 31 is The integral is applied directly to one input of the comparator 32 via a resistor 39 as the respective instantaneous value. Via elements 35, 36, it is fed as average value IJmm to the other input. another Resistor 34 is used to generate a bias voltage at the active input of comparator 32. used. Bistable multivibrator circuit 3 downstream of comparator 32 7 is a signal from the output signal of the comparator 32 for a subsequent printer control device (not shown). A second sensor signal SM is formed. The operation of the bistable multivibrator 37 is as follows. It's good. The printer controller pushes ink droplets inside the recording head and prints them. When the droplet hits the comb-shaped electrode, the resistance suddenly drops. Measured in this way The constant resistance 31 becomes smaller, so the instantaneous value Um becomes the temporal average value 1J over a short period of time. One smaller than mm. In the example of FIG. 5, from 1 to O at the output of comparator 32 A short-term level change occurs. This transition is a bistable multivibrator It is temporarily stored in the circuit 37 and further processed by the printer control device. detect drops After this, the bistable multivibrator 37 receives a reset signal via its reset input. In this way, the sensor is reset by another node of the recording head. It is activated to detect and evaluate the impact of the next ink drop from the nozzle.

The time between the printer controller's command to expel a drop and the generation of the sensor signal. By monitoring, it is possible to check the operational capabilities of individual nozzles.

Pre-given parameters such as printer configuration, drop flight time, ink composition, etc. Jumping resistance changes occur after a certain time that is adjustable depending on the meter If not, the printer controller detects that the designated nozzle is not working. do.

The aforementioned circuit arrangement operates on direct current, i.e. a voltage divider circuit is connected between the positive voltage source and earth. It is connected to the. When using certain ink fluids, this connection configuration may This is particularly the case when short-term tests are used to evaluate ink droplets. Strong when many resistance drops arriving one after the other at intervals of time are required. Measurable resistance In order to achieve anti-dropping, the ink liquid is subjected to a current over t≧100m5 in this case. , which may cause electrolytic changes. In this way the color The ink may separate from the solvent, causing the ink fluid to solidify and thus Then suction by capillary action is no longer possible.

In one embodiment of the invention, this problem is solved by having the ink drop sensor actuated by alternating current. This is solved by An example of this is shown in FIG.

The evaluation circuit shown in FIG. 6 also has a voltage divider, which includes a fixed resistor 30 and and a resistor 3 indicating the actual resistance value between the conductor paths. But in this case the voltage divider The circuit 30.31 is connected to an alternating voltage generator 38. In addition to this, 1 voltage divider time A demodulator 33 is connected between the voltage dividing point of paths 30 and 31 and the comparator 32, and the demodulator 33 In the circuit configuration shown in FIG. 7, the converter 33 functions as a so-called peak rectifier. It works. Therefore, from the output side, the instantaneous peak value of the voltage at the voltage dividing point The corresponding voltage value is taken.

This voltage value is applied directly to one input of the comparator 32 via a resistor 39 and to the other input. It is fed to the side via integration elements 35, 36 as a temporal average value. to comparator 32 comparison, switching control of bistable multivibrator circuit 37, and The transmission of the sensor signal SM in a printer control device without a printer will be explained based on FIG. It is done as it was done.

A detailed circuit configuration of one embodiment of the evaluation circuit shown in FIG. 6 is shown in FIG. Ru.

One embodiment of the structure of the sensor plate according to the present invention will be explained based on FIG. . This example is based on the arrangement of conductor tracks according to the example shown in Figure 2. Ru. To produce the sensor plate 25, a metal film is provided on the non-conductive carrier plate 26. It will be done. Advantageously, this is done by vapor deposition on a glass plate with a thickness of 0.1 to 0.8 mm. A base metallization layer of Ti and Cu is then formed.

A photolac film is then applied to both surfaces of the plate. Next, photosensitive technology is applied to one side of the surface. operatively, with the conductor tracks 18, 19 desired later on the sensor plate 25. A pattern of comb-shaped electrode structure is formed, and this pattern has 10 to 20 μm Ni. Nickel plating is applied.

In the subsequent phototechnical step, both sides of the area of the injection window 28 are exposed and this area is exposed. The glass is corroded and removed after corroding the underlying metallization layer, thus The conductor tracks 18, 19 span the region of the injection window 28 without glass. Additionally, this In the corrosion process, a so-called contact window 27 is eroded open.

The sensor plate 25 can be manufactured very advantageously by these means and is simple. It can be joined and contacted with the suction block in a simple manner. See Figure 9 for details. and FIG. 10.

The embodiment shown in FIG. 9 (plan view) and FIG. 10 (cross section) has only four differences. consisting of the casing 29, the suction block 17, and the sensor plate. 25 and contact springs 42 arranged on both sides. Non-conductive The casing 29, which is formed as a plastic injection part, is used for housing these parts. The casing 29 is arranged corresponding to the casing 29. It is fixed in the printer chassis 41 using a locking lug 4o. For example, the suction Suction made of non-conductive open porous material such as ramic, filter glass or foam The surface characteristics of the printing block 17 have a special characteristic for the side facing the ink recording head 1. Only certain requirements are made. The flatness of this surface is the flatness of the flat sensor plate 2. Porous suction block 17 to ensure good attachment of 5 to this surface. The pore size must be on the order of . As explained based on Figure 8, The support plate 25 has comb portions 121, 122. The conductor paths 18, 19, the injection window 28, and and two contact connection windows 27.

With respect to the suction block 17, the side on which the conductor track 18.19 is provided is the suction block. arranging the sensor plate 25 facing the lock 17 in mechanical correspondence; This is done by means of multifunctional contact springs 42 arranged on both sides. Assemble of this device At the time of vertical installation, the suction block 17 is installed inside the casing 29, and then the suction After mounting the sensor plate 25 on the block 17, these metal contacts are The trailing spring 42 is pushed into a corresponding introduction opening 43 of the casing 29 .

The contact spring 42 has a locking lug 44 which is located inside the casing 29. It is reliably locked in the notch 45 when introduced into. As a result, the contact connection spring 42 Three lug springs 46 formed at the ends of the sensor plate 25 Guaranteed to be attached via force. In this example, two external The lug spring 46 presses against the carrier of the sensor plate 25 and the suction block 17 This ensures that the sensor plate 25 is mounted without any gaps on top of the sensor plate 25. intermediate respectively The lug spring 46 is located in the area of the contact connection window 27 and is directly comb-shaped. Press down on the electrode structure 18, 19, thus forming an electrical contact connection. Contact The respective other ends of the touch springs 42 form the electrode terminals 13 or J4. standard socket A comb-shaped electrode is connected via a terminal formed as a flat plug 47 to the Electrical connections are made from the structure to an electrical evaluation circuit, which is not shown.

As mentioned above, the ink jetted onto the conductor paths 18 and 19 is sucked in by capillary action. Block] is sucked into 7. The suction capacity of the suction block 17 is its suction It depends on the volume and its material, the ink and the frequency of the jetting test. Increase suction volume In order to reduce the suction time and to reduce the suction time, an additional A suction block with an opening 48 for ink discharge and a suction material with a porosity higher than 7 It can be filled with

Evaluation of the impact of an ink drop with a sudden drop in resistance in the middle of the conductor path of a comb-shaped electrode. The sensor is a circuit device that sends out a sensor signal SM every time one or more ink droplets hit. (20 in FIG. 1).

The height of the jet windows 28 is matched to the vertical spacing of the external nozzles of the ink recording head. . The width of the ejection window 28 is matched to the horizontal extent of the nozzle ejection area of the ink recording head. It is. When the nozzle device has one row, a narrow injection window 28 is sufficient, and when there are multiple rows, a narrow injection window 28 is sufficient. requires a correspondingly wider injection window 28. Nozzle rows that are separated in location are used to spray It is also possible to orient sequentially in time relative to the radiation window 28. this is more advantageous Yes, because the narrow injection window 28 allows the structure of the device to be slim and the This is because it makes it possible to reduce the overall width of the printer chassis.

When using a device configured according to the present invention, this device can be used in the actual printer area. Advantageously, it is provided on the outside, for example at the left or right row end. Monitor drop extrusion In order to detect the hit of a drop, the recording head is The ink droplet sensor is moved to a position opposite to the ink droplet sensor at regular intervals. recording head assumes this position, e.g. at rest or before the start of each recording or printing, and when activated It is possible and advantageous for monitoring operations to be carried out before the start of the process. the When a failure of one or more dispensing nozzles is detected, many known ink records It can be performed manually or automatically provided in the head. Lifting the printer This allows timely and short-term spraying with a cleaning effect.

Until now, the present invention has primarily been applied to a surface provided within a printer to monitor droplet extrusion. I have explained about it. However, in order to measure and adjust the flight speed of individual ink droplets, It is also within the scope of the present technology to use the apparatus according to the present invention for this purpose. discharge nozzle Since the distance between the surface of the ink drop sensor and , which requires significant electronic costs in e.g. printer control equipment. It is possible without spending money. This method is particularly suitable for ink recording with a large number of ejection nozzles. This has significant advantages in the production of recording heads, since in this case the individual Tolerances of various electronic components and ceramic parts (e.g. piezoelectric elements) are completely avoided. control circuits, drive elements, ink channels and dispensing nozzles. This is because each system of systems must be adjusted.

The ink drop detection device described above can be easily installed or replaced within the printer. Features a compact configuration. Furthermore, this device offers the possibility of fully automatic installation , requiring only four different components that can be fabricated with suitable cost technology. Ru.

This device is extremely advantageous for ink beam printers that operate with multi-nozzle recording heads. This is because the book is not only suitable for economic quality assurance. The device can be advantageously used in the production and long-term testing of multi-nozzle recording heads. This is because that.

symbol list Ink recording head 2... Nozzle plate 3...Discharge nozzle 4...Head member 5... Ink channel 6... Drive element 7... Ink supply section 8...Ink supply pipe 9...ink droplets 10...interval 12.25...Sensor plate 13.14, 23, 24... Electrode terminal 15.16... Partial layer 17-...Suction block 18.19,181,191...Conductor path 20...Evaluation circuit 121.122,123,124...Comb part 21...Insulating sheet 26...Carrier plate 27... Contact connection window 28... Injection window 29...Casing 3o...Fixed resistance 31...Measuring resistance 32... Comparator 33... Demodulator 34.39...Resistance 35.36... Integral element 37...Bistable multivibrator circuit 38...AC voltage generator 40...locking lug 41...Printer chassis 42...Contact connection element, contact connection spring 43...Introduction opening 44...locking lug 45...notch part 46...Lug spring 47...Flat type plug 48...Discharge opening A...Width of conductor path B... Distance between conductor paths D...Diameter of ink droplet L: Height of comb part and conductor path Pl, P2...Porosity of partial layer R...Reset input side FIG 2 FIG4 FIG 5 FIG 7 FIG 8 FIG 9 international search report

Claims (1)

[Claims] 1. Ink recording head ejection using an ink droplet sensor that evaluates ink droplet hit. In a method for monitoring the extrusion of ink droplets from a nozzle, Conductor paths (18, 19; 1) arranged at a predetermined pitch (T) and formed in a comb shape 81, 191) and is located in front of the ejection nozzle (3) of the ink recording head (1). at least one ink droplet hitting the sensor plate (12, 25) evaluation circuit for the change in resistance between at least two adjacent conductor paths caused by The ink liquid supplied during the monitoring or measuring period is detected and evaluated in the channel (20). It is characterized by being discharged using capillary action by the supraterate (12, 25). A method for monitoring the ejection of ink droplets from a discharge nozzle of an ink recording head. 2. Implement a method for monitoring the ejection of ink droplets from the ejection nozzles of the ink recording head. a sensor arranged in front of the discharge nozzle (3) at an interval (10); Scrape the surface of the plate (12, 25) facing the discharge opening (3). It is formed as a comb-shaped electrode, and the conductor paths ( 18, 19; 181, 191) is the width of the conductor path (18, 19; 181, 191) (A) and the pitch (T) that determines the spacing (B), then the sensor plate (1 2, 25), a liquid drain formed by at least one non-conductive porous layer An output suction block (17) is provided, and the conductor path ( 18, 19; 181, 191) is electrically connected to the sensor. At least one drop hits the surface of the interdigitated electrode of the support plate (12, 25) At least two adjacent conductor tracks (18, 19; 181, 191 ) and transmits a sensor signal (SM). The method of monitoring the extrusion of ink droplets from a discharge nozzle of an ink recording head according to claim 1. A device that performs 3. The comb-shaped electrode consists of two comb parts (121, 122), each comb part (1 21, 122) are electrode terminals (13, 14) connected to the evaluation circuit (20). has Conductor track (18) of one comb part (121) and conductor of the other comb part (122) The tracts (19) intersect and extend into the hit area of the drop in the form of tongues, where the pitch (T) The ink recording head according to claim 2, wherein the ink recording head forms a comb structure having a comb structure. An apparatus for implementing a method for monitoring extrusion of an ink groove from a discharge nozzle. 4. It is arranged in a bifilar and travels in a meandering pattern, and the ink droplets are placed in the area where the ink droplets hit. The conductor tracks (181, 191) forming a comb structure with a switch (T) forming a rectangular electrode, Two terminals (13, 14) each of the conductor tracks (181, 191) of the bifilar Connect the evaluation circuit (20) to the terminal, and connect the other two terminals (23, 24) to each other. The ink from the ejection nozzle of the ink recording head according to claim 2, characterized in that: Apparatus for carrying out the method for monitoring the extrusion of droplets. 5. Two terminals (13, 1) of the conductor tracks (181, 191) of the bifilar each 4) is connected to the power supply during the measurement suspension period of the evaluation circuit (20), and in this case, the other The device according to claim 4, characterized in that the two terminals (23, 24) are connected to each other. A device that implements a method for monitoring the ejection of ink droplets from a discharge nozzle of an ink recording head. . 6. The pitch (T) of the comb structure is set to one to monitor the hit of each individual ink drop. smaller than or equal to the diameter (D) of an individual ink drop (T≦D) The ink recording head according to any one of claims 2 to 4, characterized in that: Apparatus for implementing a method for monitoring the ejection of ink droplets from a discharge nozzle. 7. Many single ink drops each successively extruded from one discharge nozzle (3) The pitch (T) of the comb structure is adjusted directly to one individual ink drop to monitor the hit of the comb structure. Any one of claims 2 to 4, characterized in that the diameter is larger than the diameter (T>D). A method for monitoring the ejection of ink droplets from the ejection nozzle of the ink recording head described in item 1. Apparatus for enforcing the law. 8. the suction block (17) is made of a non-conductive material having suction capability; Pressing ink droplets from the ejection nozzle of the ink recording head according to claim 2, characterized in that equipment that implements the monitoring method for 9. The suction block (17) has a suction capacity and has a different porosity, the same or At least two partial layers (15, 16) of non-conductive material with different thicknesses ), The porosity of the individual layers (15, 16) increases with increasing distance from the comb electrodes. (P2>P1) The ejection nozzle of the ink recording head according to claim 7, characterized in that: (P2>P1) Apparatus for carrying out a method for monitoring the extrusion of ink droplets from. 10. The conductor path (18, 19; 181, 191) and the comb portion (121, 122) is mounted on the suction block (17; 15, 16) as an electrode and pitch (T) characterized in that it is formed on an insulating sheet (21) formed in accordance with A discharge nozzle of an ink recording head according to any one of claims 3 to 7. Apparatus for carrying out a method for monitoring the extrusion of ink droplets from. 11. The conductor paths (18, 19) of the sensor plate (12, 25) and the comb portion (12 1, 122) on the carrier plate (26), and in this case the comb portions (121, 1) are formed on the carrier plate (26). 22) and at least one contact connection window (27) in each case and an ink groove hitch. an injection window (28) is provided in the area; A casing (29) housing the suction block (17) and a suction block (1 7), and a sensor plate (12, 25) covering the sensor plate (12, 25) is provided. , 25) with the suction block (17), and the contact connection window ( a fixing element (42) in electrical contact with the sensor plate (12, 25) via 27); The insulator according to any one of claims 3 to 7, further comprising: An apparatus for implementing a method for monitoring the ejection of ink droplets from a discharge nozzle of a recording head. 12. The casing (29) has a spring-like locking lug (40) arranged on the side. This locking lug (40) allows the casing (29) to be detachably attached to the printer. The ink recording head according to claim 11, wherein the ink recording head is fixed to the chassis (41). Apparatus for implementing a method for monitoring the extrusion of ink droplets from a discharge nozzle of a printer. 13. The casing (29) is placed outside the printer area, preferably on the left side of the printer area or is fixed to the printer chassis (41) at the right row end area. extrusion of ink droplets from the ejection nozzle of the ink recording head according to claim 12. Equipment implementing the monitoring method. 14. In the casing (29) an additional receiving area (48) for ink delivery is suctioned. The ink recorder according to claim 11, characterized in that it is provided under the ink block (17). An apparatus for implementing a method for monitoring the ejection of ink droplets from a discharge nozzle of a recording head. 15. Fixing elements (42) are arranged on both sides of the casing (29) with contact contacts. The locking lugs (44) of these contacting springs are attached to the casing (29). ) in the notch (4) of the casing (29) when introducing the contact spring (42) into the 5), and the spring-like lugs (46) of these contacting springs are under pressure. grip the surface of the sensor plate (12, 25), and at the same time at least one contact connection spring on each side of the contact connection window (27) is located in the area of the contact connection window (27). The ink from the ejection nozzle of the ink recording head according to claim 11 is characterized in that: Apparatus for carrying out a method for monitoring the extrusion of ink droplets. 16. The part of the contact connection spring (42) that is guided to the outside is used as the plug-in terminal. 16. The ejection nozzle of an ink recording head according to claim 15, Apparatus for carrying out the method of monitoring the extrusion of ink droplets according to the present invention. 17. The evaluation circuit (20) includes a fixed resistor (30) and conductor paths (18, 19; 181, 191) and a resistance (31) between terminals (13, 14) of the DC voltage source (+U ) and a comparator connected to the voltage divider point of the voltage divider circuit. (32) and a bistable multivibration controllable via the output side of the comparator (32). voltage generated at the voltage dividing point of the voltage divider circuit (30, 31). The value (Um) is connected on the one hand directly to one input of the comparator (32) and on the other hand A comparator (32) as a temporal average value (Umm) via an integrating element (35, 36) Connect to the other input side of the Depending on the resistance change between the terminals (13, 14) via the output side of the comparator (32) By switching and controlling the bistable multivibrator (37), the bistable multivibrator ( 37) sends out a sensor signal (SM), Reset the bistable multivibrator (37) again after evaluating the sensor signal (SM). The ink from the ejection nozzle of the ink recording head according to claim 1 is characterized in that: Apparatus for carrying out a method for monitoring the extrusion of ink droplets. 18. The evaluation circuit (20) includes a fixed resistor (30) and conductor paths (18, 19; 181, 191) and a resistor (31) between the terminals (13, 14) of the AC voltage generator ( 38) and the voltage dividing point of the voltage divider circuit (30, 31). and a demodulation circuit (33) connected to the On the one hand, the output side of the demodulation circuit (33) is connected directly to one input side of the comparator (32). and on the other hand, to the other input side of the comparator (32) via the integrating element (35, 36). connection, Depending on the resistance change between the terminals (13, 14) via the output side of the comparator (32) By switching and controlling the bistable multivibrator (37), the bistable multivibrator ( 37) sends out a sensor signal (SM), Reset the bistable multivibrator (37) again after evaluating the sensor signal (SM). The ink from the ejection nozzle of the ink recording head according to claim 1 is characterized in that: Apparatus for carrying out a method for monitoring the extrusion of ink droplets.