JP2007313740A - Doctor blade edge length setting implement and doctor blade fitting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a doctor blade edge length setting implement which enables easy and precise setting of the edge length of a doctor blade at a desired length on the occasion when the doctor blade is held by a doctor blade holder, and a doctor blade fitting method. <P>SOLUTION: The doctor blade edge length setting implement 10 is used on the occasion when the doctor blade is held by the doctor blade holder 30. This implement 10 has a holding part 11 which is capable of holding the doctor blade 20 and a handle part 12 which is provided for making the holding part 11 work so as to fit and remove the doctor blade 20. The holding part 11 is provided with an edge butting portion 13 with which the edge tip of the doctor blade 20 comes into contact on the occasion when the doctor blade 20 is held by the holding part 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a doctor blade cutting edge length setting jig used when a doctor blade is held by a doctor blade holder, and a doctor blade attachment method for attaching a doctor blade to a doctor blade holder.

  2. Description of the Related Art Conventionally, in a gravure printing machine that performs a printing process on a web-like substrate such as a film or paper, a doctor device is used to scrape off excess ink adhering to a plate cylinder. Such a doctor device is composed of a doctor blade and a doctor blade holder for holding the doctor blade. Here, various methods are known for positioning the tip (blade edge) of the doctor blade with respect to the doctor blade holder.

  Such a doctor device will be specifically described. As the doctor blade, a strip-shaped flexible steel plate is often used. The doctor blade is sandwiched between two flat square rod-like high-rigidity materials (for example, steel), and the doctor blade is fixed by fastening the pair of holders with bolts or the like. Here, the above-mentioned doctor blade holder is composed of a pair of holders and bolts.

  The length of the doctor blade protruding from the doctor blade holder in the front-rear direction (the direction perpendicular to the width of the doctor blade) (also referred to as “blade length” in the present specification) has been conventionally manually operated by an operator. The adjustment was performed. And the confirmation of this blade length was also performed visually by the operator using a scale. However, such a manual method has a problem that the work load and work time are large, and there is also a problem that a deviation of the cutting edge length in the front-rear direction or a deviation of the cutting edge length in the left-right direction (width direction) is likely to occur. It was.

  In general, the cutting edge length to be set is not limited to a certain size, and the optimum cutting edge length varies depending on the pattern of printed matter, the type of ink used, the material of the doctor blade, and the like. For this reason, when setting the cutting edge length corresponding to each condition each time, the manual method has caused further increase in work load, deviation of the cutting edge length, or incorrect setting. If there is a deviation or mistake in the blade length as described above, the positional relationship between the doctor device and the plate cylinder, or other printing conditions such as the pressing force of the doctor blade on the plate cylinder were optimal. Even so, a difference occurs in the bending of the doctor blade. For this reason, for example, when the same pattern is printed again, there is a problem that a difference occurs in the printing result.

  As a method of making the blade length of the doctor blade constant by using a jig, for example, a method described in Patent Document 1 is known. This method will be specifically described. First, the blade edge side of the doctor blade is sandwiched between two steel plates (jigs) over the entire width of the doctor blade. Next, after fastening these two steel plates with bolts, the tip of the jig is abutted against the front surface of the doctor blade holder for positioning. Then, after fastening the bolt on the doctor blade cage side, the cutting edge length is set by removing the jig.

Sho58-501275

  However, in the method as shown in Patent Document 1, since the jig used sandwiches the doctor blade over the entire width, the work load of the operator increases due to the increase in size and weight of the jig. There is a problem of end. Moreover, since the set blade length is limited to one value, it does not correspond to the change of the blade length of the doctor blade. Furthermore, the method of fixing the doctor blade in the jig is bolt fastening, and there is a problem that the setting work of the blade length of the doctor blade is complicated.

  The present invention has been made in consideration of such points, and when the doctor blade is held by the doctor blade holder, the blade length of the doctor blade can be easily and accurately set to a desired length. An object is to provide a doctor blade cutting edge length setting jig and a doctor blade mounting method.

  The present invention is a doctor blade cutting edge length setting jig used when holding a doctor blade in a doctor blade holder, and is a holding part capable of holding the doctor blade, the doctor blade holding the doctor blade Holding the doctor blade before holding it in the container, holding the doctor blade in the doctor blade holder and then releasing the doctor blade, and holding part for attaching and detaching the doctor blade And a blade tip abutting portion that is provided in the holding portion and that contacts the tip of the doctor blade when the doctor blade is held by the holding portion. This is a doctor blade edge length setting jig.

  According to such a doctor blade edge length setting jig, when the doctor blade is held by the doctor blade holder, the doctor blade holder is brought into contact with the holding portion of the doctor blade edge length setting jig. The cutting edge length of the doctor blade can be easily set to a desired length. In addition, since the doctor blade edge length setting jig does not need to hold the doctor blade across the entire width, the operator can easily set the blade length of the doctor blade. Furthermore, since the operator can attach and detach the doctor blade in the holding portion by gripping the handle portion, the doctor blade is compared with a method for fixing the doctor blade to the blade length setting jig by, for example, bolt fastening. The setting operation of the blade edge length can be performed more easily.

  In the doctor blade cutting edge length setting jig of the present invention, the cutting edge abutting part is slidable with respect to the holding part, and is provided in the holding part, and the cutting edge abutting part with respect to the holding part It is preferable to further include a position adjusting unit for adjusting the position. Thus, the operator can accurately and easily adjust the position of the blade edge abutting portion with respect to the holding portion, and can easily change the set blade length of the doctor blade.

  In the doctor blade cutting edge length setting jig of the present invention, it is preferable that a scale for indicating the position of the cutting edge butting section is formed on the holding section. As a result, when the operator adjusts the position of the blade edge abutting portion with respect to the holding portion, the position of the blade edge abutting portion can be set more accurately by performing work while checking the scale. The cutting edge length of the blade can be set with higher accuracy.

  The present invention is a doctor blade mounting method for attaching a doctor blade to a doctor blade holder by using a doctor blade blade length setting jig, wherein the doctor blade has a blade edge abutting portion of the doctor blade blade length setting jig. A step of positioning the doctor blade by bringing the tip into contact therewith, a step of holding the doctor blade positioned by the blade edge abutting portion in the holding portion of the doctor blade edge length setting jig, and the holding portion A step of holding the doctor blade held by the doctor blade holder, and a step of releasing the doctor blade held by the doctor blade holder from the holding portion of the doctor blade edge length setting jig. Doctor blade removal characterized by having It is a method.

  According to such a doctor blade mounting method, when the doctor blade is held by the doctor blade holder, the blade edge of the doctor blade is brought into contact with the holding portion of the doctor blade edge length setting jig. The length can be easily set to a desired length. In addition, since the doctor blade edge length setting jig does not need to be held across the entire width of the doctor blade, the operator can easily set the blade edge length of the doctor blade.

  In the doctor blade mounting method of the present invention, before the doctor blade is positioned by bringing the tip of the doctor blade into contact with the blade edge abutting portion of the doctor blade edge length setting jig, the doctor blade edge length setting is performed. It is preferable to adjust in advance the position of the blade abutting portion with respect to the holding portion of the jig. As a result, the operator can easily change the set blade length of the doctor blade.

  In the doctor blade mounting method of the present invention, it is preferable that two doctor blade edge length setting jigs are used, and each doctor blade edge length setting jig holds the vicinity of both ends of the doctor blade. As a result, the size of the doctor blade edge length setting jig can be reduced, and the edge length can be accurately set over the entire width of the doctor blade.

  According to the doctor blade cutting edge length setting jig and the doctor blade mounting method of the present invention, when the doctor blade is held by the doctor blade holder, the cutting edge length of the doctor blade can be easily and accurately set to a desired length. Can do.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an embodiment of a doctor blade edge length setting jig according to the present invention.
Among these, FIG. 1 is a schematic side view showing the configuration of the doctor blade edge length setting jig of the present embodiment, and FIG. 2 shows the doctor blade using the doctor blade edge length setting jig shown in FIG. FIG. 3 is a schematic side view showing a state when being held by a doctor blade holder, and FIG. 3 is a perspective view showing details of a configuration of a holding part and a blade edge abutting part of the doctor blade edge length setting jig shown in FIG. is there. FIG. 4 is a schematic configuration diagram showing a state when the doctor blade held by the doctor blade holder rubs the plate cylinder of the printing unit.
The doctor blade edge length setting jig of the present embodiment is used for setting the edge length of the doctor blade when the doctor blade is held by the doctor blade holder.

  First, a doctor blade and a doctor blade holder for holding the doctor blade will be described with reference to FIG. The doctor blade held by the doctor blade holder constitutes a part of the doctor device. FIG. 4 shows a configuration of a printing unit including such a doctor device.

  As shown in FIG. 4, the printing unit 40 is configured to perform printing by causing ink to adhere to the surface of a web-like substrate W such as a film or paper that is continuously conveyed. The printing unit 40 sandwiches a web-like printed material W between an ink pan 41 for storing ink, a plate cylinder 43 to which ink in the ink pan 41 is fed via a finisher roll 42, and the plate cylinder 43. A pressure drum 44 that performs printing, and a doctor device 45 that scrapes off excess ink adhering to the surface of the plate cylinder 43.

  The furnisher roll 42 is provided so that its outer peripheral surface is immersed in the ink in the ink pan, and the ink in the ink pan adheres to the outer peripheral surface by rotating in the direction of the arrow in FIG.

  The plate cylinder 43 abuts on the finisher roll 42 and is pressed by the impression cylinder 44 to form a nip point N. A plurality of cells (dents) are formed on the surface of the plate cylinder 43, and ink adhering to the outer surface of the finisher roll 42 is filled in each cell by contacting the finisher roll 42. The However, of the ink sent from the outer surface of the finisher roll 42 to the plate cylinder 43, excess ink that has not been filled in each cell adheres to the outer surface of the plate cylinder 43.

  The doctor device 45 is provided at a position downstream of the finisher roll 42 in the rotation direction of the plate cylinder 43 and upstream of the impression cylinder 44. The doctor blade 20 of the doctor device 45 rubs the outer surface of the plate cylinder 43 so that the ink filled in each cell of the plate cylinder 43 is maintained as it is, and the excess ink adhered to the outer surface. Is to be scraped off. The doctor device 45 includes a doctor gantry 46, a doctor blade holder 30 attached to the doctor gantry 46 and capable of moving forward and backward toward the plate cylinder 43, and the above-described doctor blade held by the doctor blade holder 30. 20.

  The doctor blade 20 is made of, for example, a strip-shaped flexible steel plate, and the cutting edge thereof has an acute angle as shown in FIG. The doctor blade holder 30 includes an upper doctor holder 31, a lower doctor holder 32, and fastening bolts 33 for fastening the upper doctor holder 31 and the lower doctor holder 32. It is sandwiched between the doctor holder 31 and the lower doctor holder 32. The upper doctor holder 31 and the lower doctor holder 32 are made of a highly rigid material made of, for example, steel. After the doctor blade 20 is sandwiched between the upper doctor holder 31 and the lower doctor holder 32, the upper doctor holder 31 and the lower doctor holder 32 are fastened by the fastening bolt 33, so that the doctor blade 20 becomes the doctor blade holder 30. Fixed against.

  The length in the width direction of the doctor blade 20 and the doctor blade holder 30 (the length in the direction perpendicular to the paper surface of FIG. 4) is substantially the same as the length in the width direction of the plate cylinder 43.

  Next, the configuration of the doctor blade edge length setting jig 10 used when the doctor blade 20 is held by the doctor blade holder 30 will be described. Here, the cutting edge length of the doctor blade 20 refers to a length of the doctor blade 20 that protrudes further from the front surface 31a, 32a of the doctor blade holder 30 and the lower doctor holder 32 toward the tip. Say.

As shown in FIG. 1, the doctor blade edge length setting jig 10 includes a holding unit 11 that can hold the doctor blade 20, and an operator for manually operating the holding unit 11 so as to attach and detach the doctor blade 20. A handle portion 12 and a blade edge abutting member 13 provided on the holding portion 11 and against which the tip of the doctor blade 20 abuts when the doctor blade 20 is held by the holding portion are provided. Here, as shown in FIG. 2, the holding unit 11 holds the doctor blade 20 before holding the doctor blade 20 on the doctor blade holder 30, and then holds the doctor blade 20 on the doctor blade holder 30. After the holding, the holding part 11 releases the doctor blade 20. Further, the blade edge abutting member 13 is slidable with respect to the holding part 11, and the holding part 11 has a position adjusting part 14 for adjusting the position of the blade edge abutting member 13 with respect to the holding part 11. Is attached.
Hereinafter, each component of the doctor blade edge length setting jig 10 will be described in detail.

  As shown in FIG. 1, the holding portion 11 includes a base 11a, a shaft 11b provided near the rear end of the base 11a, and a shaft 11b that is pivotally supported by the shaft 11b with the shaft 11b as a center. The holding member 11c is rotatable. Then, the doctor blade 20 is placed on the base 11a, and the clamping member 11c is rotated toward the upper surface of the doctor blade 20 (counterclockwise in FIG. 1), so that the doctor blade 20 is connected to the base 11a. It is clamped between the clamping members 11c. The length of the holding portion 11 in the width direction (the length in the direction perpendicular to the paper surface of FIG. 1) is, for example, in the range of 50 to 100 mm. As shown in FIG. 3, a guide groove for sliding the blade edge abutting member 13 is provided in the center of the surface of the base 11a.

  The handle portion 12 includes a lower handle portion 12a attached to the base 11a of the holding portion 11, an upper handle portion 12b attached to the holding member 11c, and a spring (spring) connecting the lower handle portion 12a and the upper handle portion 12b. ) 12c. Here, the lower handle portion 12a and the upper handle portion 12b are configured so that an operator can hold them with one hand. Specifically, when the operator is not gripping the handle portion 12, as shown in FIG. 2, the lower handle portion 12a and the upper handle portion 12b are brought into a substantially parallel state by the repulsive force against the compression of the spring 12c, and the base 11a. And the clamping member 11c will be in the state which adjoined. On the other hand, as shown in FIG. 1, when the operator grips the handle portion 12 with one hand so that the lower handle portion 12a and the upper handle portion 12b approach each other, the holding member 11c is pivoted with respect to the base 11a of the holding portion 11. Rotating in the direction of the arrow in FIG. 1 around 11b, the clamping member 11c is separated from the base 11a. Here, the length in the width direction of the handle portion 12 (the length in the direction perpendicular to the paper surface of FIG. 1) is substantially the same as the length in the width direction of the holding portion 11.

  In this way, when the operator holds the handle portion 12 with one hand, the holding portion 11 is structured to release the doctor blade 20, and when the operator releases the handle portion 12, the spring 12 c is repelled. The doctor blade 20 is held by the holding unit 11 by the force.

As shown in FIGS. 1 to 3, especially FIG. 3, a blade edge abutting member 13 is slidably mounted on a base 11 a of the holding portion 11. The blade edge abutting member 13 is used for positioning the doctor blade 20 with respect to the holding portion 11 when the doctor blade 20 is held by the holding portion 11.
The blade edge abutting member 13 is made of a substantially rectangular parallelepiped-shaped resin having high wear resistance (for example, MC nylon). As a result, it is possible to suppress damage to the blade edge when the blade edge of the doctor blade 20 abuts against the blade edge abutting member 13, and it is also possible to suppress damage to the base 11a. The length in the width direction of the blade edge abutting member 13 is substantially the same as the length in the width direction of the holding portion 11 as shown in FIG. Moreover, as shown in FIG. 3, the protrusion member fitted to the guide groove of the base 11a is attached to the lower surface of the blade edge | tip abutting member 13.

  As shown in FIG. 3, the position adjusting unit 14 is provided with a backing plate 14 a that is attached to the base 11 a of the holding portion 11 so as to extend vertically upward, and is provided on the backing plate 14 a, and the tip is abutted against the blade edge. The adjusting screw 14 b is attached to the member 13. A female screw hole is formed in the contact plate 14a, and the male screw portion of the adjustment screw 14b is engaged with the female screw hole. By rotating the adjustment screw 14b, the contact plate of the adjustment screw 14b itself is formed. The position with respect to 14a can be adjusted. As shown in FIG. 3, a floating joint is provided at the tip of the adjustment screw 14b, and the adjustment screw 14b and the blade edge abutting member 13 are connected by this floating joint. Accordingly, the operator can adjust the position of the blade tip abutting member 13 in the advancing / retreating direction (the position in the left-right direction in FIG. 3) with respect to the base 11a of the holding unit 11 by rotating the adjustment screw 14b.

  In addition, as shown in FIG. 3, the scale 11p for showing the position of the blade edge | tip abutting member 13 is attached | subjected to the both sides | surfaces of the base 11a of the holding | maintenance part 11. As shown in FIG. Thus, when the operator rotates the adjustment screw 14b to adjust the position of the blade tip abutting member 13 in the advancing / retreating direction with respect to the base 11a of the holding portion 11, the blade tip abutting member 13 is observed by visually observing the scale 11p. The position of can be confirmed more accurately.

  Next, the operation of the doctor blade blade length setting jig 10 of the present embodiment having such a configuration will be described. Specifically, a method of attaching the doctor blade 20 to the doctor blade holder 30 by using two doctor blade edge length setting jigs 10 will be described.

  First, before holding the doctor blade 20 with the doctor blade edge length setting jig 10, the operator sets the position of the blade edge abutting member 13 relative to the base 11 a of the holding portion 11 in each doctor blade edge length setting jig 10. The position adjustment unit 14 adjusts in advance. Specifically, the operator turns the adjustment screw 14b of the position adjustment unit 14 to adjust the forward / backward direction position (left-right direction position in FIG. 2) of the blade abutting member 13 while looking at the scale 11p.

  Next, the operator holds the handle portion 12 of each doctor blade edge length setting jig 10 to separate the base 11a of the holding portion 11 from the clamping member 11c (see FIG. 1). And in such a state, the front-end | tip in the vicinity of the both ends of the doctor blade 20 is made to contact | abut to each blade edge | tip abutting member 13 of the two doctor blade edge length setting jigs 10, respectively. Thus, the doctor blade 20 is positioned in the vicinity of both ends of the doctor blade 20.

  Thereafter, the operator releases his / her hand from the handle portion 12 to bring the base 11a of the holding portion 11 and the clamping member 11c closer (see FIG. 2). As a result, the doctor blade 20 positioned by the blade edge abutting member 13 is held by the holding portion 11.

  Then, the doctor blade 20 is held by the doctor blade holder 30 in a state where the vicinity of both ends of the doctor blade 20 is held by each doctor blade cutting edge length setting jig 10. Specifically, while the front surface 31a of the upper blade holder 31 and the front surface 32a of the lower blade holder 32 are brought into contact with the front surface of the holding unit 11 (see FIG. 2), the doctor blade 20 is moved to the upper blade holder 31 and the lower blade. The upper blade holder 31 and the lower blade holder 32 are fastened with the fastening bolts 33 while being clamped by the holder 32. Thereby, the doctor blade 20 is fixed to the doctor blade holder 30. At this time, as shown in FIG. 2, the cutting edge length of the doctor blade 20 is set as the length of the portion sandwiched between the holding portions 11 of the doctor blade 20.

  Finally, the doctor blade 20 fixed by the doctor blade holder 30 is released from the holding portion 11 of each doctor blade edge length setting jig 10. In this manner, the attachment operation of the doctor blade 20 to the doctor blade holder 30 is completed.

  As described above, according to the doctor blade edge length setting jig 10 of the present embodiment, the holding part 11 that can hold the doctor blade 20 and the handle part for operating the holding part 11 to attach and detach the doctor blade 20. 12 is provided with a blade edge abutting member 13 against which the tip of the doctor blade 20 abuts when the doctor blade 20 is held by the holding portion 11. Therefore, when the doctor blade 20 is held by the doctor blade holder 30, the blade length of the doctor blade 20 is brought into contact with the holding portion 11 of the doctor blade blade length setting jig 10. Can be easily set to a desired length. In addition, since the doctor blade edge length setting jig 10 does not need to hold the doctor blade 20 over the entire width, the operator can easily set the edge length of the doctor blade 20. Further, since the doctor blade 20 can be attached to and detached from the holding portion 11 by the handle portion 12, for example, the blade edge length of the doctor blade 20 is compared with a method in which the doctor blade 20 is fixed to a blade edge length setting jig by bolt fastening. The setting work can be performed more easily.

  Here, as the doctor blade edge length setting jig 10, it is preferable to use one having a width direction length (length in a direction perpendicular to the paper surface of FIG. 1) in a range of, for example, 50 to 100 mm. . When the length in the width direction of the doctor blade blade edge length setting jig 10 is smaller than 50 mm, the doctor blade 20 is brought into contact with the blade edge butting member 13 when the doctor blade 20 is brought into contact with the blade edge butting member 13. It is difficult to set the blade length of the doctor blade 20 to a desired length over the entire width. On the other hand, when the length in the width direction of the doctor blade edge length setting jig 10 exceeds 100 mm, the weight of the doctor blade edge length setting jig 10 increases, and the operator sets the edge length of the doctor blade 20 by the operator. Work becomes difficult.

  The blade edge abutting member 13 is slidable with respect to the holding portion 11, and the holding portion 11 is provided with a position adjusting portion 14 for adjusting the position of the blade edge abutting member 13 with respect to the holding portion 11. By doing so, the operator can accurately and easily adjust the position of the blade edge abutting member 13 with respect to the holding portion 11, and can easily change the set blade edge length of the doctor blade 20.

  Moreover, when the operator adjusts the position of the blade edge abutting member 13 with respect to the holding part 11 by forming a scale 11p for displaying the position of the blade edge abutting member 13 in the holding part 11, By performing the work while checking the scale 11p, the position of the blade abutting member 13 can be set more accurately, and the blade length of the doctor blade 20 can be set more accurately.

  Further, when attaching the doctor blade 20 to the doctor blade holder 30, two doctor blade edge length setting jigs 10 are used, and each doctor blade edge length setting jig 10 is used to hold the vicinity of both ends of the doctor blade 20 respectively. By doing so, the dimensions of the doctor blade edge length setting jig 10 can be reduced, and the edge length can be set with high accuracy over the entire width of the doctor blade 20.

It is a schematic side view which shows the structure of the doctor blade blade length setting jig | tool of embodiment of this invention. It is a schematic side view which shows the state at the time of hold | maintaining a doctor blade to a doctor blade holder | retainer using the doctor blade cutting edge length setting jig | tool shown in FIG. It is a perspective view which shows the detail of a structure of the holding | maintenance part of a doctor blade blade length setting jig | tool shown in FIG. It is a schematic block diagram which shows the state at the time of the doctor blade hold | maintained at a doctor blade holder | retainer rubbing the plate cylinder of a printing unit.

Explanation of symbols

10 Doctor blade blade length setting jig 11 Holding portion 11a Base 11b Shaft 11c Holding member 11p Scale 12 Handle portion 12a Lower handle portion 12b Upper handle portion 12c Spring 13 Blade edge abutting member 14 Position adjusting portion 14a Abutting plate 14b Adjusting screw 20 Doctor blade 30 Doctor blade holder 31 Upper doctor holder 31a Front face 32 Lower doctor holder 32a Front face 33 Fastening bolt 40 Printing unit 41 Ink pan 42 Furnisher roll 43 Plate cylinder 44 Impression cylinder 45 Doctor device 46 Doctor stand

Claims (6)

A doctor blade blade length setting jig used when holding the doctor blade in the doctor blade holder,
A holding portion capable of holding the doctor blade, holding the doctor blade before holding the doctor blade on the doctor blade holder, and holding the doctor blade on the doctor blade holder and holding the doctor blade A holding part that releases the blade;
A handle part for operating the holding part to attach and detach the doctor blade;
A blade edge abutting portion, which is provided in the holding portion, and a tip of the doctor blade contacts when the doctor blade is held by the holding portion;
A doctor blade edge length setting jig characterized by comprising: The blade edge butting portion is slidable with respect to the holding portion,
The doctor blade edge length setting jig according to claim 1, further comprising a position adjusting part that is provided in the holding part and adjusts a position of the blade edge butting part with respect to the holding part.   The doctor blade cutting edge length setting jig according to claim 2, wherein a scale for indicating the position of the cutting edge butting section is formed in the holding section. A doctor blade mounting method for attaching a doctor blade to a doctor blade holder by using a doctor blade edge length setting jig,
A step of positioning the doctor blade by bringing the tip of the doctor blade into contact with the blade edge abutting portion of the doctor blade edge length setting jig;
Holding the doctor blade positioned by the blade abutting portion on the holding portion of the doctor blade blade length setting jig; and
Holding the doctor blade held by the holding unit in the doctor blade holder;
Releasing the doctor blade held by the doctor blade holder from the holding portion of the doctor blade edge length setting jig;
A doctor blade mounting method characterized by comprising:   Prior to positioning the doctor blade by bringing the tip of the doctor blade into contact with the blade edge abutting part of the doctor blade edge length setting jig, the edge of the blade against the holding part of the doctor blade edge length setting jig The doctor blade mounting method according to claim 4, wherein the position of the portion is adjusted in advance.   6. The doctor blade according to claim 4 or 5, wherein two doctor blade edge length setting jigs are used, and each doctor blade edge length setting jig is configured to hold the vicinity of both ends of the doctor blade. Mounting method.

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