The printing control method of printing equipment and printing equipment
Technical field
The present invention relates to have the printing equipment of the portion of reciprocator that uses crank and the printing control method of printing equipment.
Background technology
Printing equipment in the past has the portion of reciprocator that uses crank, and portion of mechanism makes the have a plurality of lettering elements word hammer group back and forth movement of (for example putting hammer) thus.In this kind printing equipment, developed the position signalling that uses the rectilinear motion position sensor that is arranged on the parts that move simultaneously with portion of reciprocator (below be called linear transducer), the physical location of prediction lettering element has generated lettering element drives sequential (timing) (with reference to Patent Document 1, Patent Document 2).
In addition, developed adjustment by carrying out the printing starting position (below, be called the phase place adjustment), be used to prevent because parts loosening or press quality low method of adjustment (with reference to Patent Document 3) that alignment error caused.
Fig. 1 has represented to use example of formation of portion of reciprocator of the crank mode of linear transducer.By motor 31, the eccentric cam 22 that is installed on the motor reel rotates in the direction of arrow A, by with the word hammer group 20 of portion of reciprocator one and eccentric cam 22 on the crank 21 installed, word hammer group 20 is along the crossbeam direction back and forth movement shown in the arrow B.Shown in Fig. 1 is upper left, for the circular diameter of radius the amplitude amount of the back and forth movement of word hammer group 20 with the range difference at crank center position and motor reel center (below, be called crank eccentricity L 1).
Linear transducer 32 is configured in the word hammer and organizes on the parts (arm 33 in this example) of 20 synchronization actions, by synchronous with the rectilinear motion of word hammer group 20, and tram that can identifier word hammer group 20.Thereby, if word hammer group 20 moves the change in location that every generation is certain, based on the signal that linear transducer 32 sends, generate lettering element drives sequential, by the lettering element drives sequential that generates, the lettering element is driven, and carries out driving the loop by lettering, to the printing printing.
Represent to export with 1/180 inch interval the signal of linear transducer 32 among Fig. 2,1/180 inch interval is promptly with the example under the 180dpi generation lettering element drives sequential situation.When surveying with 1/180 inch interval, and generate come from institute's survey time (t1 for example, t2, lettering element drives sequential t3) (d1, d2, d3).By using linear transducer 32, because can directly monitor printing position from the back and forth movement of word hammer group 20, so the deviation effects of the amplitude amount in the back and forth movement of word hammer group 20 that can not be subjected to because the dimensional tolerance of eccentric cam 22 etc. caused is printed in the position of expectation.
Patent documentation 1: the spy opens the 2000-127509 communique
Patent documentation 2: the spy opens the 2002-337412 communique
Patent documentation 3: the spy opens flat 10-16303 communique
In existing printing equipment with the portion of reciprocator that uses crank, use the position signalling of linear transducer, generate lettering element drives sequential, but the high-resolution linear transducer price general charged costliness of press quality is guaranteed in required being used to, and has the high such problem of cost of machine.For solving described problem, consider not use the high linear transducer of price, and use top low-cost rotary encoders such as being installed in motor reel, generate the method for the driving sequential of lettering element.
Fig. 3 represents to use the example of formation of portion of reciprocator of the crank mode of rotary encoder.Motor 31 rotates the eccentric cam that is installed on the motor reel in the direction of arrow A, makes word hammer group 20 along the crossbeam direction back and forth movement shown in the arrow B with the word hammer group 20 of portion of reciprocator one with the crank 21 that is installed on the eccentric projection 22.Same with the formation of described linear transducer, be the amplitude amount that the diameter of a circle constituting word hammer of radius is organized 20 back and forth movements with the crank eccentricity L 2 of upper left expression in scheming.
By rotatablely moving synchronously of rotary encoder 30 and motor 31, backward position that can identifier word hammer group 20.Thus, as shown in Figure 4, by the home signal S of rotary encoder 30, detecting the backward position of word hammer group 20, is benchmark with this backward position, and based on the lettering element drives time series data of setting, output lettering element drives sequential is printed.And the signal of rotary encoder 30 was exported with arbitrary interval, and generated lettering element drives sequential based on this signal.Like this, follow moving of word hammer group 20, based on output signal from rotary encoder 30, generate the driving sequential of lettering element, utilize the driving sequential of the lettering element that generates, by lettering element drives loop, the lettering element is driven to printing, prints.
Yet, use under the situation of cheap rotary encoder not using expensive linear transducer, though can discern the anglec of rotation of motor, but because can not detect the amplitude amount of word hammer group, deviation former state face of land in print result of the amplitude amount of the word hammer group that dimensional tolerance caused of the crank offset that generates during by component processing or when installing is revealed to come, the print range change causes press quality low.Low by the press quality that the dimensional tolerance of crank offset causes about this, though can be resolved by the dimensional accuracy of being strict with parts such as eccentric projection, crank, along with the unit price rising of parts, cost has also improved.
As shown in Figure 5, with print range B1 constriction under the situation of print range B2, as (a) → (c) (driving data before (a) expression is adjusted, (c) driving data after the compensation of expression constriction print range of Fig. 5 as print range compensation.) shown in, if adjust interval between each of whole lettering element drives sequential individually, can the constriction print range.But to prevent that press quality from lowly being in the existing use phase place adjustment (b) of purpose, because the interval of lettering element drives sequential is constant, can not adjust the driving sequential individually.Thereby, can not can not prevent the low of press quality to carrying out the compensation of print range based on the dimensional tolerance of crank size offset.
Summary of the invention
The present invention need not increase cost to provide, and can compensate because the deviation of the print range that the dimensional tolerance of crank size offset causes, thereby prevents that the printing equipment that press quality is low and the printing control method of printing equipment from being purpose.And then, its objective is provide a kind of to since in the device variations in temperature or the deviation that changes the print range cause in time compensate, thereby prevent the printing equipment that press quality is low and the printing control method of printing equipment.
The printing control method that the invention provides a kind of printing equipment that is used to deal with problems, described printing equipment has: word hammer group, it is equipped with a plurality of lettering elements, along crossbeam direction back and forth movement; Portion of reciprocator, it has the crank that is used to make described word hammer group back and forth movement; Data hold, it has a plurality of lettering element drives time series datas, these a plurality of lettering element drives time series datas are used for coming and going the described a plurality of lettering elements of driving, the printing control method of described printing equipment is characterised in that, comprising: the operation of deviation that detects the print range of each lettering element that the dimensional tolerance by described crank causes; Based on the testing result of described detection operation, from described a plurality of lettering element drives time series datas, select the operation of only lettering element drives time series data; Based on described only lettering element drives time series data, drive the operation of described a plurality of lettering elements.
Detecting the deviation that operation is preferably based on the adjacent interelement print range of lettering herein, detects.
In addition, described printing equipment has multiple printing mode, preferably has a plurality of lettering element drives time series datas under every kind of printing mode respectively.
In addition, preferably also comprise: according to temperature in the device of described printing equipment, will be based on the operation of Temperature Compensation value in the described device and the addition of described optimal lettering element drives time series data.
In addition, preferably also comprise: according to the variation in time of described printing equipment, will be based on the operation of described time dependent offset and the addition of described optimal lettering element drives time series data.
In addition, preferably: described printing equipment has the timer of measuring the accumulation printing time, in the described addition operation, according to the accumulation printing time of measuring by described timer, with described offset and the addition of described optimal lettering element drives time series data.
In addition, preferably: described printing equipment has the motor that is used for coming and going the described word hammer group of driving, in the described addition operation, according to the accumulation rotation number of described motor, with described offset and the addition of described optimal lettering element drives time series data.
Preferred in addition, described printing equipment has the timer of measuring the accumulation printing time and the motor that is used for coming and going the described word hammer group of driving, in described addition operation, based on the either party in the accumulation rotation number of described at least accumulation printing time of measuring by timer and described motor, with described offset and the addition of described optimal lettering element drives time series data.
In addition, the invention provides a kind of printing equipment, it has: word hammer group, and it is equipped with a plurality of lettering elements, along crossbeam direction back and forth movement; Portion of reciprocator, it has the crank that is used to make described word hammer group back and forth movement; Data hold, it has a plurality of lettering element drives time series datas, these a plurality of lettering element drives time series datas are used for coming and going the described a plurality of lettering elements of driving, this printing equipment is characterised in that to have: the checkout gear of deviation that detects the print range of each lettering element that the dimensional tolerance by described crank causes; Based on the testing result of described detection operation, from described a plurality of lettering element drives time series datas, select the selecting arrangement of only lettering element drives time series data; Based on described only lettering element drives time series data, drive the drive unit of described a plurality of lettering elements.
Herein, preferred described checkout gear detects based on the deviation of the adjacent interelement print range of lettering.
In addition, preferably have multiple printing mode, under every kind of printing mode, have a plurality of lettering element drives time series datas respectively.
In addition, has the shell that holds described word hammer group, portion of described reciprocator, reaches described data hold, and according to temperature in the described shell, based on the adding device of Temperature Compensation value in the described device and the addition of described optimal lettering element drives time series data.
Preferably also comprise in addition: according to the variation in time of described printing work, will be based on the adding device of described time dependent offset and the addition of described optimal lettering element drives time series data.
Preferred in addition, have the timer of measuring the accumulation printing time, described adding device is according to the accumulation printing time of being measured by described timer, with described offset and the addition of described optimal lettering element drives time series data.
Preferred in addition, have the motor that is used for coming and going the described word hammer group of driving, described adding device is according to the accumulation rotation number of described motor, with described offset and the addition of described optimal lettering element drives time series data.
Preferred in addition, have the timer of measuring the accumulation printing time and the motor that is used for coming and going the described word hammer group of driving, described adding device, based on the either party in the accumulation rotation number of described at least accumulation printing time of measuring by timer and described motor, with described offset and the addition of described optimal lettering element drives time series data.
Preferred in addition, have with the perpendicular direction of described crossbeam direction on the conveyance printing paper advance mechanism portion and support the pressing plate of the lettering power of described lettering element, between described word hammer group and described pressing plate, dispose described printing and China ink band, in word hammer group back and forth movement process, drive described lettering element and carry out lettering.
According to the present invention, can not adopt the linear transducer of high price, in addition the dimensional accuracy of parts is not needed to be strict with, and can prevent low by the press quality that deviation caused of the caused print range of dimensional tolerance of crank offset.In addition, can be to because variations in temperature in the printing equipment or device change the change of the print range cause in time compensates, thus can guarantee press quality.
Description of drawings
Fig. 1 is illustrated in the schematic diagram of the example that the portion of reciprocator of the crank mode of the use linear transducer in the printing control method of existing printing equipment constitutes.
Fig. 2 is the sequential chart of the lettering element drives sequential generation method under the use linear transducer situation in the printing control method of existing printing equipment.
Fig. 3 is illustrated in the schematic diagram of the example that the portion of reciprocator of the use rotary encoder in the printing control method of existing printing equipment constitutes.
Fig. 4 is the sequential chart of the lettering element drives control method under the use rotary encoder situation in the printing control method of existing printing equipment.
Fig. 5 be the expression compensation of dwindling print range with existing phase place adjustment between different key diagrams.
Fig. 6 is the stereogram of the simple formation of the expression printing equipment that uses the control method in the embodiments of the present invention.
Fig. 7 is the profile of the simple formation of the word hammer group shown in the presentation graphs 6.
Fig. 8 is a controlling party block diagram of implementing printing control method being used in the embodiments of the present invention.
The key diagram of the action of the lettering element that Fig. 9 implements when being crank offset compensation model in the embodiments of the present invention.
Figure 10 is the key diagram of the object lesson (offset is little) of the crank offset compensation model in the expression embodiments of the present invention.
Figure 11 is the key diagram of the object lesson (offset is big) of the crank offset compensation model in the expression embodiments of the present invention.
Figure 12 is the key diagram about the compensation method of the print range in the embodiments of the present invention (and lettering element drives sequential).
The specific embodiment
Printing equipment to the printing control method that uses embodiment of the present invention describes.
An example of the printing mechanism portion of the expression printing equipment of Fig. 6 signal.Printing equipment has the portion of reciprocal (shuttle) mechanism 63 that uses crank 61, and this portion of reciprocator 63 makes the word hammer group back and forth movement with a plurality of lettering elements 71 (Fig. 9).Portion of reciprocator 63 has motor 59, rotary encoder 1, eccentric cam 60 and crank 61.Motor 59 makes eccentric cam 60 rotate along the arrow E direction.Crank 61 is installed on the eccentric cam 60.The rotation of motor 59 and crank 61 make word hammer group 51 along the crossbeam direction back and forth movement shown in the arrow C.Word hammer group 51 be situated between by China ink with 52 and lettering with paper 53 and the pressing plate 54 subtends configuration that is used to support lettering power, a plurality of lettering elements in time are driven in the back and forth movement process of word hammer group 51, with mode printing word and figure on lettering usefulness paper 53 of dot matrix.In this printing process, the paper advance mechanism portion 56 that is constituted by haulage gear 55 and paper feeding motor 57 in time, follow direction (D direction among the figure, vertical direction) and carry lettering with paper 55 with the crossbeam direction.The control of this action is undertaken by control device 62 described later.
Fig. 7 schematically illustrates the formation of word hammer group 51.Word hammer group 51 has a plurality of lettering elements, and this lettering element is to hammer 71 into shape by the word of the front end that is installed in leaf spring 70 to constitute.The lettering element discharges the bending energy that has in advance by discharging with solenoid on leaf spring 70, be situated between to be with 52 to carry out the dot matrix lettering at lettering on paper 53 by China ink.And the magnetic attraction that resets of permanent magnet 73 turns back to and yoke (コ system ヨ one Network) 74 position contacting leaf spring 70, carries out a succession of action printing repeatedly.
In the printing equipment of above-mentioned formation, has multiple printing mode.First kind of printing mode be with 200 row/minute the speed common printed pattern of printing 16 spot size literal; Second kind of printing mode be with 100 row/minute the speed high-quality printing mode of printing 24 spot size literal; The third printing mode be with 350 row/minute the speed high speed printing pattern of printing 12 spot size literal.Distinguish the printing of using suitable printing mode just can realize meeting purpose on demand.
Next, Fig. 8 is illustrated in the control section 62 of explanation just now, takes out the control loop of the part relevant with present embodiment.
Control loop shown in Figure 8 (controlling party block diagram) has rotary encoder 1, timer 4, comparator 6, sequential generating apparatus 7, compensation section 2, reaches configuration part 13.Timer 4 is received on the rotary encoder 1, based on carrying out timing by the home signal of rotary encoder 1.Time data and lettering element drives time series datas that 6 pairs of comparators are measured by timer 4 compare, during the sequential of data consistent, to sequential generating apparatus 7 output signals.Sequential generating apparatus 7 is accepted the signal that comparator 6 sends, and drives the lettering element.2 pairs of lettering element drives of compensation section time series data carries out necessary compensation, and the lettering element drives time series data after the compensation outputs to comparator 6.
In addition, compensation section 2 has holding device 3, adder 5, sensing device 8, the first compensation holding device 11, event counter 9, timer 10, reaches the second offset holding device 12.Holding device 3 has time series data holding device 3A and setting data holding device 3B.Time series data holding device 3A keeps a plurality of lettering element drives time series datas except that printing mode.Setting data holding device 3B handle is preserved as setting data with the corresponding data of lettering element drives time series data, and this lettering element drives time series data is selected from the predefined data of other lettering element drives time series data correspondences except that printing mode (for example except that printing mode 0~24).Adder 5 is with the offset exported in the first or second offset holding device and lettering element drives time series data addition by output in the holding device 3.Temperature in the sensing device 8 perception printing equipments, and the temperature data in will installing is transported to the first offset holding device 11.The first offset holding device 11 maintains and is used to judge whether that the threshold value that need compensate the temperature in installing reaches when needs compensate Temperature Compensation value in installing.In addition, the first offset holding device 11 need to judge whether compensation based on threshold value to temperature in the device that is transported by sensing device 8, when needing compensation, selects only offset from offset, and this offset is delivered to adder 5.The input counting number of 9 pairs of home signals of event counter, and the input number of home signal of accumulation is transported to the second offset holding device 12.10 pairs of printing time timing of timer, and with the accumulation printing time be transported to the second offset holding device 12.The second offset holding device 12 maintains based on accumulation home signal that is transported by event counter 9 and timer 10 and accumulation printing time and judges whether that the threshold value that need compensate reaches the offset of relative each data when needing compensation.In addition, whether 12 pairs of data that transported by event counter 9 and timer 10 of the second offset holding device need compensation based on threshold decision, when needs compensate, select only offset from offset, and this offset is delivered to adder 5.
In addition, configuration part 13 has checkout gear and selecting arrangement 14.The print result of checkout gear 15 identifications crank offset compensation model described later.Selecting arrangement 14 is selected the setting data of only crank offset compensation model from the print result of the crank offset compensation model of checkout gear 15 identification, and under every kind of printing mode with this data setting in holding device 3.
In above-mentioned formation, compensation section 2 makes the lettering element drives time series data optimization of each printing mode, home signal with rotary encoder 1 is a benchmark, generate lettering element drives sequential according to optimized lettering element drives time series data and print, thus the deviation of the print range that compensation is caused by the dimensional tolerance in crank footpath (crank offset).
Specifically, preserve multiple (for example every kind pattern 25 kinds) lettering element drives time series data of each printing mode in the holding device 3.And timer 4 utilizes the output signal of rotary encoder 1 to reset.Comparator 6 reads in all lettering element drives time series datas corresponding with the printing equipment P shown in Fig. 9 (a) and (b) from all lettering element drives time series datas of each printing mode, when the data of timer 4 were consistent with lettering element drives time series data, comparator 6 was to sequential generating apparatus 7 output signals.Sequential generating apparatus 7 is based on generating lettering element drives sequential from the signal in the comparator 6, realize printing shown in Fig. 9 (a) and (b) thereby drive the lettering element.Particularly, use and the adjacent lettering element of print range shown in lettering element 71A, the 71B, utilize word hammer group 51 moving to first direction C1, lettering element 71A prints (Fig. 9 (a)), next, carry a certain amount of paper of using, and word hammer group 51 moves to the direction C2 opposite with first direction C1, the same position that prints with lettering element 71A at crossbeam P, adjacent lettering element 71B prints (Fig. 9 (b)), repeats above action (this kind lettering is handled and is called crank offset compensation model).
And from above-mentioned result, as described later, every kind of printing mode is set optimal lettering element drives time series data by configuration part 13.And the signal of output is reset timer 4 in the rotary encoder 1.Comparator 6 once reads in the lettering element drives time series data that configures from holding device 3, when the data of timer 4 were consistent with lettering element drives time series data, comparator 6 was to sequential generating apparatus 7 output signals.Sequential generating apparatus 7 prints thereby drive the lettering element based on generate lettering element drives sequential from the signal in the comparator 6.Can in each printing mode, compensate the deviation of the print range that the dimensional tolerance by the crank offset causes thus.
And, in this example, though being provided with configuration part 13 compensates automatically, but also can select and the every kind of optimal lettering element drives of printing mode time series data by visual print result, and utilize input unit (for example button input) input and the corresponding setting data of selected lettering element drives time series data, directly set lettering element drives sequential compensation section.
Below, crank offset compensation model and compensation method thereof are described.And in every kind of printing mode, crank offset compensation model all has several.
An example of the crank offset compensation model of Figure 10 and 9 explanations of Figure 11 presentation graphs.It directly is the situation of crank footpath D1 that Figure 10 (a), Figure 11 (a) expression does not have desirable (benchmark) crank of dimensional tolerance.Figure 10 (b) expression directly is the situation of crank footpath D2 than the little crank in desirable crank footpath, and Figure 11 (b) expression directly is the situation of crank footpath D3 than the big crank in desirable crank footpath.Shown in Figure 10 (a), Figure 11 (a), under the situation of desirable crank footpath D1, use the lettering element drives time series data TD1 (crank offset compensation model B) that does not have compensation when printing, in the crossbeam direction printing position skew does not take place.That is, between print range R2, the R3 of the lettering element of print range R1 and adjacency, do not generate the gap.
But, shown in Figure 10 (b), when crank footpath (crank offset) than the little situation of desirable crank footpath D1 under, if use the lettering element drives time series data TD1 (crank offset compensation model B) of benchmark, print range R1 narrows down.Thereby generate the gap between print range R2, the R3 of the lettering element of print range R1 and adjacency, in print result, produce skew.As Figure 12, obtain lettering element drives sequential, the compensation print range herein, by resetting by angle with the corresponding printing position of crank offset described later (crank footpath).Under the situation of Figure 10 (b), print range is narrower than benchmark print range, therefore, shown in arrow X, therefore use crank offset compensation model A to compensate to suitable print range, this crank offset compensation model A strengthens the interval of the driving sequential of each lettering element, thereby to strengthening the lettering element drives sequential TD3 that print range compensates.
In addition, shown in Figure 11 (b), when crank footpath (crank offset) than the big situation of desirable crank footpath D1 under, if use the lettering element drives time series data TD1 (crank offset compensation model B) of benchmark, print range R1 broadens.Thereby generate the gap between print range R2, the R3 of the lettering element of print range R1 and adjacency, in print result, produce skew.As Figure 12, obtain lettering element drives sequential, the compensation print range herein, by resetting by angle with the corresponding printing position of crank offset described later (crank footpath).Under the situation of Figure 11 (b), print range is wideer than benchmark print range, therefore, shown in arrow Y, therefore use crank offset compensation model C to compensate to suitable print range, this crank offset compensation model C reduces the interval of the driving sequential of each lettering element, thereby to reducing the lettering element drives sequential TD2 that print range compensates.
Thinking methods is as shown in figure 12 followed in the compensation of print range, realizes by the resulting lettering element drives of the angle sequential that resets with the corresponding printing position of crank offset (crank footpath).Particularly, be located under the crank footpath D1 of benchmark, its suitable print range R (angular range in corresponding printing position) is benchmark print range (180 °-2 θ
1), the driving sequential of seeking the lettering element based on this reference range.The crank offset is than under the big or little situation of benchmark crank offset, if use benchmark print range (180 °-2 θ
1), print range changes shown in print range A, B.Thereby the crank offset is necessary print range A, B are compensated to suitable print range R than under the big or little situation of benchmark crank offset.Herein, based on the print range R of benchmark, the offset of corresponding crank is established print range (angular range in corresponding printing position) and is respectively
(180 °-2 θ
2): the crank offset is than the big situation of benchmark crank offset
(180 °-2 θ
3): the crank offset, can be adjusted and the corresponding printing sequential of the variation of crank offset then by resetting on each printing position in print range the angle according to the lettering element drives sequential of print range compensation than the little situation of benchmark crank offset.
And, select the setting data of optimum lettering element drives time series data (crank offset compensation model) by the range estimation print result, so that the printing position skew is minimum on the above-mentioned crossbeam direction, perhaps select by configuration part 13 as shown in Figure 8, promptly, by the print result of checkout gear 15 detection crank offset compensation models, print result is selected by selecting arrangement 14 thus.And, in holding device 3, every kind of printing mode is set with setting data, uses the corresponding and lettering element drives time series data except that printing mode of setting data with crank offset compensation way, and the signal of exporting in the rotary encoder 1 makes timer 4 replacements.Comparator 6 is by the lettering element drives time series data that reads successively in the holding device 3 after the setting, when the data of timer 4 with set after lettering element drives time series data when consistent, comparator 6 is to sequential generating apparatus 7 output signals.Sequential generating apparatus 7 prints thereby drive the lettering element based on generate lettering element drives sequential from the signal in the comparator 6.This kind method can compensate the deviation by the print range that dimensional tolerance caused of crank offset under each printing mode.And, adopt the compensation of above-mentioned crank offset compensation model when dispatching from the factory or keep in repair, to carry out usually.
In addition, about temperature in sensing device 8 sensing devices, surpassing when temperature under the situation of the threshold value (for example 50 ℃) that the first offset holding device 11 has, is benchmark with the home signal of rotary encoder 1, successively offset is delivered to adder 5 from the first offset holding device 11.And adder 5 is added to lettering element drives time series data automatically with offset.When the data of timer 4 were consistent with lettering element drives time series data after changing, comparator 6 was to sequential generating apparatus 7 output signals.Sequential generating apparatus 7 prints thereby drive the lettering element based on generate lettering element drives sequential from the signal in the comparator 6.Thus, can compensate the print range deviation that causes by variations in temperature in the device.
In addition, in the printing control method of the printing equipment of present embodiment, in the time of can not only working as temperature in the above-mentioned device and change lettering element drives time series data is compensated, and the variation in time that can work as printing equipment compensates lettering element drives time series data.There are two kinds about changing in time, the one, along with printing time, parts change in time, cause by the accumulation printing time, the 2nd, the accumulation of the back and forth movement of portion of reciprocator, the i.e. variation in time that the component wear that the accumulation of motor rotation number causes causes.But in the present embodiment, owing to have multiple printing mode, the accumulative total printing time is false with the corresponding relation of accumulative total motor rotation number.Herein, the data of timer 10 are when certain data (for example 1000 hours) are above in the present embodiment, and the accumulation motor rotation number that is obtained by accumulation home signal counter 9 is certain data (for example 400,000,000 change) when above, and second compensation arrangement 12 stores these two data as threshold value.And, when the either party surpass its threshold value the time, be benchmark with the home signal of rotary encoder 1, from the second offset holding device 12, successively offset is delivered to adder 5.And adder 5 is added to lettering element drives time series data automatically with offset.When the data of timer 4 were consistent with lettering element drives time series data after changing, comparator 6 was to sequential generating apparatus 7 output signals.Sequential generating apparatus 7 prints thereby drive the lettering element based on generate lettering element drives sequential from the signal in the comparator 6.Thus, can compensate by changing the print range deviation that causes in time.And, also can be according to the either party of accumulation printing time or accumulation motor rotation number, the compensation of the print range when device for carrying out said changes in time.
Owing to have above formation, can not adopt the linear transducer of high price, the dimensional accuracy to parts does not need to be strict with in addition, and can prevent low by the press quality that deviation caused of the caused print range of dimensional tolerance of crank offset.In addition, can be to because variations in temperature in the printing equipment or device change the change of the print range cause in time compensates, thus can guarantee press quality.