JP4278627B2 - Transport amount detection method and transport device using the same - Google Patents

Description

  The present invention relates to a conveyance amount detection method and a conveyance device for conveying a continuous object to be processed and performing processing based on the conveyance amount.

  In recent years, there has been a demand for improvement in accuracy and quality in processing by various processing apparatuses such as a printing system, a mold processing and a laser processing system. As for the thing, detection of the conveyance amount in conveyance has big influence on accuracy and quality. In particular, when the detection of the conveyance amount is affected by the difference in the thickness of the object to be processed, it is necessary to detect the conveyance amount with high accuracy for each thickness.

  Conventionally, when conveying an object to be processed such as continuous paper or film, the conveyance amount is generally detected by a rotation pulse by providing an encoder on the roller for conveying. In order to minimize the detection error due to slipping, an encoder is provided on the roller around which the workpiece is wound. The following patent document discloses a technique for detecting the continuous conveyance amount of the object to be processed in such a conveyance apparatus according to the thickness.

JP-A-7-187465

  The above-mentioned patent document discloses a paper feed amount adjusting mechanism, specifically, for adjusting the rotation amount of the paper supply roller in accordance with the paper thickness, and a marginal punch having a marginal punch hole formed in the paper. A large-diameter first transfer roller and a small-diameter second transfer roller are arranged across the cylinder, and the rotation amount of these is detected by an encoder, and the deviation of the rotation amount rate that varies depending on the sheet thickness is detected from the difference in the number of output pulses. By obtaining this, the conveyance state based on the sheet thickness is detected.

However, since the detection of the conveyance amount for feed adjustment disclosed in the above patent document, encoders is that detects the conveyance status of the inner sheet wound around the rollers (a side in contact with the roller) For example, the resolution of the encoder for detecting the difference of one pulse needs to be 3184 pulses or more (paragraph [0011] of the above publication), and five pulses are used for feedback control such as adjusting the paper feed amount. When the above difference is required, the resolution of the encoder needs 15920 pulses or more.

In other words, an encoder having such a resolution, although depending on the disk diameter of the encoder, has a problem that it becomes expensive as the resolution increases with a resolution of 3000 pulses as a boundary, and it is difficult to manufacture if the resolution is too high. However, there is a problem that the overall mechanism is soared .

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a transport amount detection method and a transport apparatus that can realize transport amount detection based on a difference in sheet thickness at low cost and high accuracy.

In order to solve the above-mentioned problem, in the invention of claim 1, the continuous object to be processed is used in a processing apparatus that conveys a continuous object to be processed based on the conveyance amount. The first roller is wound around at least one first roller having a predetermined diameter in the conveying path, and a second roller having a predetermined diameter is brought into contact with an outer portion of the object to be processed in the wound portion. And a transport amount detection method in a transport apparatus provided with a first detection means and a second detection means for detecting the rotation amount of the second roller, wherein the rotation amount relative to the winding inner side of the object to be conveyed is the first Obtaining from the detection means, obtaining the rotation amount with respect to the winding outside from the second detection means, and calculating the rotation angle of the first roller from the obtained rotation amount inside the winding. And calculating the rotation angle of the second roller from the amount of rotation outside the winding, the calculated rotation angle, and the diameter of the second roller from the center of the first roller. The distance from the center of the first roller to the outer side of the object is calculated based on the step of calculating the distance to the outer side of the winding, the diameter of the first roller, and the calculated distance from the center of the first roller to the outer side of the winding. a step of computing the distance to the center thickness, the distance from the center of the first roller and the arithmetic until thickness center of the workpiece, as well as, the diameter of the first roller, and the rotation angle of the object to be processed And a step of calculating the conveyance amount of the central portion of the thickness.

In the invention of claim 2, and conveying the continuous shape of the object to be processed by predetermined conveying means, in it shall be used in the processing apparatus to perform the process based on the conveying amount, substantially in the thickness direction of the object to be processed A transport device that detects a transport amount of a central portion, wherein a first roller having a predetermined diameter that winds the continuous object to be processed along a transport path, and an outer portion of a portion around which the object to be processed is wound A second roller having a predetermined diameter that is in contact with the roller, a first detection unit that detects a rotation amount of the first roller, a second detection unit that detects a rotation amount of the second roller, and the first detection. The rotation angles of the first roller and the second roller are calculated from the respective rotation amounts of the inner side and the outer side of the object to be processed from the means and the second detection means, and the respective rotation angles and the diameter of the second roller are calculated. From the first The distance from the center of the roller to the outside of the object to be wound is calculated, and the distance from the center of the first roller to the center of the object to be processed is calculated from the distance to the outside of the object to be wound and the diameter of the first roller. , the distance from the center of the first roller to the object to be processed thickness center, as well as, the diameter of the first roller, and the rotation angle, control including a process of calculating the conveyance amount of the thickness center portion of the object to be processed And a processing means.

  According to the present invention, the continuous object to be processed is wound around the first roller provided with the first detecting means, and the second roller provided with the second detecting means is in contact with the outside of the object to be wound. The rotation angle of each roller is calculated from the amount of rotation inside and outside the winding of the object to be processed from the first detection means and the second detection means, and the first roller is calculated using each rotation angle. The distance from the center of the workpiece to the outer side of the object to be wound is calculated, and the distance from the center of the first roller to the center of the object to be processed is calculated using the distance to carry the conveyance amount of the thickness center portion of the object to be processed By calculating the above, it is possible to always obtain the transport amount of the central portion of the thickness regardless of the thickness of the object to be processed without requiring a high-resolution detection means. Detection of transport amount One in which it is possible to the current possible.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a case where a transport apparatus that realizes the transport amount detection method according to the present invention is applied to a printing system is shown, but the present invention can also be applied to a laser processing system that performs processing using laser light. In the printing system of this embodiment, continuous paper is shown as an example of the object to be processed, but it is a continuous film or a flexible medium that can be printed by other printing (or laser processing, etc.). It may be.

  FIG. 1 is a configuration diagram of a printing system including a transport device that realizes a transport amount detection method according to the present invention. FIG. 1A is a plan configuration diagram of the printing system, and FIG. 1B is a schematic side configuration diagram. 1A and 1B, in the printing system 11, a print head 14 that performs printing by, for example, an ink jet method is disposed between supports 12 and 13, and a printing stand 15 is disposed below the print head 14. . Further, on both sides of the print head 14 in the conveying direction, an infeed roller 16 and a pull roller 17 which are first rollers that are rotatable by ball bearings or the like are disposed on the supports 12 and 13.

  As shown in FIG. 1B, the in-feed roller 16 is wound around a path (before printing with the print head 14) that conveys the continuous paper 41 that is the object to be processed. The pull roller 17 is also wound after printing by the print head 14. That is, the continuous paper 41 is continuously conveyed by an infeed roller 16 and a pull roller 17 by a conveyance driving mechanism described later.

  Further, an auxiliary roller 18 as a second roller is disposed so as to come into contact with an outer portion of the continuous paper 41 wound around the infeed roller 16 and is rotatably supported by the support bodies 12 and 13 by ball bearings or the like. A first encoder 20 that is a first detecting means for detecting the amount of rotation of the infeed roller 16 is provided on one rotary shaft 19 of the infeed roller 16, and one rotary shaft 21 of the auxiliary roller 18 is provided on one rotary shaft 21. A second encoder 22 is provided as second detection means for detecting the rotation amount of the auxiliary roller 18. The detection pulses from the first encoder 20 and the second encoder 22 are sent to control processing means (described in FIG. 2).

  On the other hand, the other rotating shaft 23 of the infeed roller 16 is directly connected to the pulley 24 and is connected to the pulley 26 via the drive transmission belt 25. A pulley 28 is coupled to the pulley 26 through a differential mechanism 27 coaxially. The motor shaft 30 of the differential motor 29 is directly connected to the pulleys 26 and 28 and the rotating shaft of the differential mechanism 27. One rotating shaft 31 of the pull roller 17 is directly connected to a pulley 33 via a hysteresis clutch 32, and a motor shaft 35 of a main motor 34 is directly connected to the rotating shaft of the pulley 33. Further, a drive transmission belt 36 is suspended between the pulley 33 and the pulley 38.

  As shown in FIG. 1B, the continuous paper 41 is schematically wound around the infeed roller 16 from a supply roll (not shown) and passed between the print head 14 and the print table 15 to be a pull roller. 17 is wound around a winding roll (not shown). The infeed roller 16 is driven by the differential motor 29 via the drive transmission belt 25 (this may drive the auxiliary roller 18 or both), but both drive. Instead of having a source, it may be rotated in a follow-up form simply by conveying the continuous paper 41. 1A and 1B, a portion excluding the print head 14 and the printing stand 15 is a conveying device.

  Here, FIG. 2 shows a processing block diagram of the conveyance amount detection in the conveyance of FIG. The control processing means 51 in FIG. 2 controls the entire printing system 11 in FIG. 1, but here, elements corresponding to processing relating to the paper conveyance amount are shown, and print data processing and conveyance control are shown. Etc. are omitted.

  In FIG. 2, the control means 51 receives signals from the first encoder 20, the second encoder 22 and the input means 52, and outputs a control signal to the print head 14 after performing the processing shown in FIG. The apparatus includes a sampling means 61, an interface (IF) 62, a carry amount calculating means 63, a setting means 64, and a head drive control means 65.

  The sampling means 61 is for sampling the detection pulses from the first encoder 20 and the second encoder 22 every predetermined time for carrying amount calculation, and is constituted by an electronic circuit for that purpose. The IF 62 is mainly for matching the input signal from the input means 52 with the signal form in the control processing means 51, and is constituted by an electronic circuit for that purpose. The carry amount calculating means 63 calculates the carry amount at the central portion in the thickness direction of the continuous paper 41 based on the detection pulses from the first encoder 20 and the second encoder 22 extracted during the sampling period of the sampling means 61. It is composed of an electronic circuit provided with a program for this purpose. The calculation of the carry amount will be described in detail with reference to FIGS.

  The setting means 64 stores element values for calculating the transport amount input from the input means 52, and includes a memory circuit for that purpose. The element values include at least the diameter (radius) of the infeed roller 16 and the auxiliary roller 18, and the total number of pulses of the first encoder 20 and the second encoder 22 when these rollers make one rotation (this is the resolution). It is. The head drive control means 65 sends a control signal for controlling printing (head nozzle drive) to the print head 14 based on the calculated transport amount of the continuous paper 41, and an electronic circuit provided with a program therefor It is comprised by.

FIG. 3 shows a processing flowchart of the transport amount calculation in FIG. 2, and FIG. 4 shows a principle explanatory diagram of the transport amount calculation in FIG. 3, first, the setting means 64 from the input unit 52, the radius r ₁ of the infeed roller 16, the radius R ₁ of the auxiliary roller 18, when the resolution TP ₁ to (infeed rollers 16 of the first encoder 20 is rotated 1 And the resolution TP ₂ of the second encoder 22 (total number of pulses when the auxiliary roller 18 makes one rotation) is set (step (S) 1).

Therefore, when the conveyance is started (S2), the sampling means 61 samples the detection pulse input from the first encoder 20 and the detection pulse from the second encoder 22 at a predetermined interval, and the infeed roller 16 and The sampling pulse numbers P ₁ and P ₂ corresponding to the rotation amount of the auxiliary roller 18 are specified (S3).

Subsequently, the conveyance amount calculation means 63, from the first sampling pulses from the encoder 20 P ₁ and one rotation of the pulse number of the in-feed roller 16 (Resolution) TP ₁ Metropolitan identified, at the infeed roller 16 The rotation angle θ ₁ of the sampling period is calculated, and the number of sampling pulses P ₂ from the specified second encoder 22 and the number of pulses (resolution) TP ₂ for one rotation of the auxiliary roller 18 are determined by the auxiliary roller 18. The rotation angle θ ₂ during the sampling period is calculated (S4).

For example,
_{P 1 / TP 1 = θ 1} /360 → θ 1 = (360 × P 1) / TP 1
_{P 2 / TP 2 = θ 2} /360 → θ 2 = (360 × P 2) / TP 2
The rotation angles θ ₁ and θ ₂ of each roller can be obtained by the following equation. The rotation angles θ ₁ and θ ₂ can be obtained in the same manner whether they are within one revolution or more than one revolution.

Further, the calculated said rotary angle theta _1, based on the theta _2, the arithmetic equation L ₂ = 2.pi.R ₁ × transport amount L ₂ wrapped outside of the continuous paper 41 being conveyed (FIG. 4) (θ _{2/360)
L 2 = 2πr 2 × (θ} 1/360)
Thus, the distance r ₂ (FIG. 4) from the center of the infeed roller 16 to the outside of the continuous paper 41 is calculated (S5).

That is, from the above calculation formula for L ₂ ,
_{2πR 1 × (θ 2/360} ) = 2πr 2 × (θ 1/360)
Substituting the values of θ ₁ and θ ₂ above,
r ₂ = (TP ₁ / TP ₂ ) × (P ₂ / P ₁ ) × R ₁
It becomes.

Subsequently, the thickness of the continuous paper 41 from the center of the infeed roller 16 is calculated based on the calculated distance r ₂ from the center of the infeed roller 16 to the outside of the continuous paper 41 and the radius r _{1 of the} infeed roller 16. A distance r ₀ (FIG. 4) to the central portion is calculated (S6). That is,
r ₀ = r ₁ + {(r ₂ −r ₁ ) / 2}
Is obtained by substituting the value of r ₂ above.

Further, the transport amount L ₀ (FIG. 4) of the central portion of the continuous paper 41 is calculated from the calculated distance r ₀ from the center of the infeed roller 16 to the central thickness portion of the continuous paper 41 (S7). That is,
_{L 0 = 2πr 0 × (θ} 1/360)
Further, by substituting the value of r ₀ , the transport amount at the central portion of the thickness of the continuous paper 41 can be obtained.

Based on the calculated transport amount L ₀ of the central portion of the continuous paper 41, the head drive control means 65 sends a drive control signal to the print head 14 for control (S8).

  Here, the rotation detection by the first encoder 20 and the second encoder 22 due to the difference in sheet thickness will be described. For example, it is assumed that the radii of the infeed roller 16 and the auxiliary roller 18 are both 30 mm, the resolutions of the first encoder 20 and the second encoder 22 are both 3000 pulses, and the sheet thickness is 70 μm and 170 μm.

Now, in case the infeed roller 16 is 1/2 turn as the sampling period (the amount of rotation of approximately 94mm by L ₁ in FIG. 4), the input number of pulses from the first encoder 20 with respect to the infeed roller 16, the paper is In the case of 70 μm or 170 μm, 1500 pulses are similarly applied.

  On the other hand, in the auxiliary roller 18 (second encoder 22), when the sheet thickness is 70 μm, the sheet thickness is (3000 pulses / 2) × (30.07 / 30) == 1503.5 pulses. When the thickness is 170 μm, (3000 pulses / 2) × (30.17 / 30) = 1509.0 pulses, and a difference occurs in the input pulses from the second encoder 22 due to the difference in the sheet thickness. Also, it is possible to calculate the conveyance amount at the center of thickness, and to detect the accurate conveyance amount.

  That is, regardless of the thickness of the continuous paper 41, the transport amount at the central portion of the thickness can always be obtained by using an encoder having a resolution of about 3000 pulses. The detection can be realized.

  By the way, although the case where the auxiliary roller 18 is arranged with respect to the in-feed roller 16 is shown in the above embodiment, in the example of FIG. 1, the auxiliary roller 18 with respect to the pull roller 17 (provided with the first encoder 20). Even when the (second encoder 22) is arranged, similarly, the conveyance amount of the central portion of the thickness of the continuous paper 41 can be detected with high accuracy.

  The transport amount adjusting method and transport device of the present invention are used in various systems that perform processing based on the transport amount of a continuous object to be processed such as a mechanical processing system and a laser processing system in addition to the printing system. Suitable.

It is a block diagram of a printing system provided with the conveyance apparatus which implement | achieves the conveyance amount detection method which concerns on this invention. FIG. 2 is a processing block diagram of transport amount detection in the transport of FIG. 1. It is a processing flowchart of the conveyance amount calculation in FIG. FIG. 3 is a diagram for explaining the principle of carrying amount calculation in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Printing system 14 Print head 16 Infeed roller 17 Pull roller 18 Auxiliary roller 20 1st encoder 22 2nd encoder 41 Continuous paper 51 Control processing means

Claims (2)

Conveying a continuous shape of the workpiece, used in the processing apparatus to perform processing based on the conveyance amount, winding the continuous shape of the workpiece, the first roller of the at least one predetermined diameter in a path for conveying And a first detection means for detecting a rotation amount of the first roller and the second roller by bringing a second roller having a predetermined diameter into contact with an outer portion of the object to be processed at the wound portion. A transport amount detection method in a transport device provided with second detection means,
Acquiring from the first detection means the amount of rotation of the object to be conveyed that is wound around the inner side of the winding, and acquiring the amount of rotation of the outer side of winding from the second detection means;
Calculating a rotation angle of the first roller from the acquired rotation amount inside the winding, and calculating a rotation angle of the second roller from the rotation amount outside the winding;
Calculating the distance from the center of the first roller to the outer side of the object to be wound from the calculated rotation angle and the diameter of the second roller;
Calculating the distance from the center of the first roller to the thickness center of the workpiece based on the diameter of the first roller and the calculated distance from the center of the first roller to the winding outside;
The first roller distance from the center to the Thickness center of the object of which is the arithmetic as well as the diameter of the first roller, and the rotation angle, a step of computing the carrying amount of the thickness center portion of the object to be processed ,
A transport amount detection method comprising: It is used in a processing apparatus that transports a continuous object to be processed by a predetermined transport means and performs processing based on the transport amount, and detects a transport amount at a substantially central portion in the thickness direction of the object to be processed. A conveying device,
A first roller having a predetermined diameter for winding the continuous object to be processed along a conveying path;
A rotatable second roller having a predetermined diameter that is in contact with an outer portion of the wound portion of the object to be processed;
First detection means for detecting a rotation amount of the first roller;
Second detection means for detecting a rotation amount of the second roller;
The rotation angles of the first roller and the second roller are calculated from the rotation amounts on the inner side and the outer side of the winding of the object to be processed from the first detection unit and the second detection unit, respectively. The distance from the center of the first roller to the outside of the object to be wound is calculated from the diameter of the two rollers, and the object to be processed from the center of the first roller is calculated from the distance to the outside of the object to be wound and the diameter of the first roller. calculates the distance to the body thickness center, distance from the center of the first roller to the object to be processed thickness center, as well as, the diameter of the first roller, and the rotation angle, the thickness center portion of the object to be processed Control processing means including processing for calculating the transport amount;
A conveying apparatus comprising:

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