Computerized flat knitting machine needle plate insert structure and its combined processing technology

Abstract

The present invention provides a needle plate insert structure for a computer flat knitting machine, comprising a clip, a left protective plate and a right protective plate, wherein the left protective plate and the right protective plate are respectively welded to the left and right side surfaces of the clip, the left protective plate is provided with a groove one extending from the front end opening and toward the rear end, the groove one and the left side surface of the clip constitute a needle slot one for accommodating a knitting needle, the right protective plate is provided with a groove two extending from the front end opening and toward the rear end, the groove two and the right side surface of the clip constitute a needle slot two for accommodating another knitting needle, the two knitting needles respectively move forward and backward in the axial directions of the needle slot one and the needle slot two through the two openings, the present invention ensures the accuracy requirements after the needle slots are arranged on both sides of the insert, avoids the occurrence of the partition between the two needle slots of each insert being deformed due to the milling grooves, and improves the quality of the woven fabric.

Description

Technical Field

[0001] The invention belongs to the technical field of parts of a flat knitting machine, and in particular relates to a needle plate inserting piece structure of a computerized flat knitting machine and a combined processing technology thereof. Background Art

[0002] The existing knitting machine is provided with a needle plate, and a plurality of inserts are arranged at intervals in the length direction of the needle plate. The interval between two adjacent inserts forms a needle groove, and a knitting needle is arranged in each needle groove. There are two knitting methods for knitting the body, sleeves and collar at the same time. One is to use the ordinary two-needle plate flat knitting machine to knit with alternate needles to achieve a one-time garment. The needle pitch of this alternate needle knitting method is much larger than the standard needle pitch of the ordinary flat knitting machine, resulting in the arc between the coils being lengthened, the coil density being small, the fabric tightness being poor, and the elasticity and strength of the yarn being required to be very high, and the thread is easy to break during the knitting process. The other is to use a four-needle plate flat knitting machine, and two more needle plates are set above the original needle plate, so that the knitting needles are set up and down. However, during the knitting process, the knitting needle hooks on the upper needle plate cannot be as close to the barrel mouth of the front end of the needle plate as the knitting needle hooks on the lower needle plate, making it relatively difficult for the knitting needles on the upper needle plate to form a loop, and a knitting needle with a specially structure is required. The knitting needle structure is relatively complex, the knitting needle manufacturing is difficult, the cost is high, and the elasticity and strength requirements of the yarn are also relatively high.

[0003] Therefore, if two knitting needles are arranged in the interval between each two adjacent inserts, thereby increasing the knitting needle density and reducing the needle distance, in the case of interlaced knitting, it can not only meet the full-form knitting process requirements, but also prevent the arc between the coils from being elongated, the coil density is too small, and the fabric is poor in tightness. The insert to achieve this kind of knitting needle arrangement needs to have two needle grooves on both sides of it, thereby increasing the interval distance and accommodating two knitting needles.

[0004] The general idea is to perform milling processing on both sides of the insert to mill out two symmetrical needle grooves, but this manufacturing process will have the following problems: first, since the insert itself is very thin, after milling the needle groove on one side of the insert, when milling the needle groove on the symmetrical side, the partition between the two needle grooves will be thinner, causing the partition to deform during milling; second, it is difficult to keep the depth of the two needle grooves consistent, making it difficult to center the partition between the two needle grooves, resulting in inconsistent spacing between the knitting needles installed in the needle grooves on each insert. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a needle plate insert structure for a computer flat knitting machine and a combined processing technology thereof, which solves the problem that if the grooves on the inserts of the existing computer flat knitting machine are processed by the milling process, it is very easy to cause the partition between the two grooves on each insert to deform during milling, and it is also difficult to ensure that the depths of the two grooves are completely consistent.

[0006] The present invention provides a needle plate insert structure of a computer flat knitting machine, comprising a clip, a left protective plate, and a right protective plate. The left protective plate and the right protective plate are respectively welded to the left and right side surfaces of the clip. The left protective plate is provided with a groove one extending from its front end opening to the rear end, and the groove one and the left side surface of the clip constitute a needle groove one for accommodating a knitting needle. The right protective plate is provided with a groove two extending from its front end opening to the rear end, and the groove two and the right side surface of the clip constitute a needle groove two for accommodating another knitting needle. The two knitting needles move forward and backward in the axial direction of the needle groove one and the needle groove two through the two openings respectively.

[0007] Furthermore, the clip, the left guard plate and the right guard plate are each an integrally formed plate and have the same length.

[0008] Further, the clip includes a front half piece and a rear half piece spliced ​​together front and back, the left protective plate includes an inlay piece 1 and an inlay piece 3 spliced ​​up and down, and the right protective plate includes an inlay piece 2 and an inlay piece 4 spliced ​​up and down, the rear end of the front half piece is provided with a rear protrusion, the front end of the rear half piece is provided with a front recess that fits with the rear protrusion, the rear protrusion and the front recess are spliced ​​together, the inner side surface of the inlay piece 1 and the inner side surface of the inlay piece 3 are respectively welded to the upper and lower sides of the left side surface of the front half piece, and the inner side surfaces of the inlay piece 2 and the inlay piece 4 are respectively welded At the upper and lower sides of the right side of the front half piece, inlay piece 1 and inlay piece 3 form groove 1, inlay piece 2 and inlay piece 4 form groove 2, groove 1 and the left side of the front half piece constitute needle groove 1 for accommodating one knitting needle, groove 2 and the right side of the front half piece constitute needle groove 2 for accommodating another knitting needle, and the rear ends of inlay piece 1, inlay piece 2, inlay piece 3 and inlay piece 4 are respectively provided with convex heel 1, convex heel 3, convex heel 2 and convex heel 4, which are all assembled with the front notch and welded together.

[0009] Furthermore, the first inlay and the third inlay are welded to each other, and the second inlay and the fourth inlay are welded to each other.

[0010] Furthermore, the first convex heel and the second convex heel are spliced ​​into a first convexity, and the first convexity and the rear convexity are consistent in shape and size; the third convex heel and the fourth convex heel are spliced ​​into a second convexity, and the second convexity and the rear convexity are consistent in shape and size.

[0011] Furthermore, the rear protrusion includes a main body, semicircular convexity 1 and semicircular convexity 2, the main body is a triangle, semicircular convexity 1 and semicircular convexity 2 are respectively arranged on the two oblique sides of the main body, and semicircular recess 1 and semicircular recess 2 are also respectively provided on the two side lines of the front recess, and semicircular convexity 1 and semicircular convexity 2 are respectively matched with semicircular recess 1 and semicircular recess 2.

[0012] The combined processing technology of the needle plate insert structure of the computer flat knitting machine includes the following steps:

[0013] ① Use different dies to punch out the three steel strips on a vertical punching bed to obtain the blanks of the clip, the left guard and the right guard respectively;

[0014] ②Level the three blanks on a leveling machine;

[0015] ③First, use a welding fixture to clamp the clip, left guard plate, and right guard plate together according to the position relationship required for assembly, and then use a spot welding machine to spot weld the left guard plate and the right guard plate on the left and right sides of the clip respectively;

[0016] ④ Grind and polish the welded insert blank on a grinding and polishing machine;

[0017] ⑤ Check the flatness of the insert blanks and remove those that do not meet the flatness requirements.

[0018] The combined processing technology of the needle plate insert structure of the computer flat knitting machine includes the following steps:

[0019] ① Use different dies to punch out the six steel strips on a vertical punching bed to obtain the front half sheet, the back half sheet, the first insert, the second insert, the third insert, and the fourth insert blanks respectively;

[0020] ②Level the six blanks on a leveling machine;

[0021] ③ First, use a welding fixture to clamp the first, second, third, fourth and first half pieces together according to the position relationship required for assembly, and then use a spot welding machine to spot weld each piece with the first half piece to obtain a combined piece;

[0022] ④ First, use a welding fixture to clamp the rear half of the sheet together with the combined sheet obtained in step ③, then spot weld the adjacent edges of the inlay 1 and the inlay 3 together, spot weld the adjacent edges of the inlay 2 and the inlay 4 together, and then weld the convex heels and the front concave edges of each inlay together using a laser welding machine;

[0023] ⑤ Grind and polish the welded insert blank on a grinding and polishing machine;

[0024] ⑥ Check the flatness of the insert blanks and remove those that do not meet the flatness requirements.

[0025] The present invention has the following beneficial effects:

[0026] The present invention comprises a clip, a left protective plate and a right protective plate, wherein the left protective plate and the right protective plate are respectively welded to the left and right side surfaces of the clip, the left protective plate is provided with a groove 1 which opens from its front end and extends to the rear end, the groove 1 and the left side surface of the clip constitute a needle groove 1 for accommodating one knitting needle, the right protective plate is provided with a groove 2 which opens from its front end and extends to the rear end, the groove 2 and the right side surface of the clip constitute a needle groove 2 for accommodating another knitting needle, the two knitting needles respectively move forward and backward in the axial directions of the needle groove 1 and the needle groove 2 through the two openings, thereby increasing the number of knitting needles and improving the knitting needle density on the premise of the same number of inserts.

[0027] This structural design replaces the previous milling groove process. The clip, left guard plate and right guard plate only need to be stamped out according to the size and thickness requirements, and then assembled through welding, so that there is a needle groove on each side of the insert. First, it avoids the deformation of the partition between the two needle grooves on each insert, ensuring that the knitting needle can be smoothly accommodated in the needle groove; second, it ensures that the depth of the two needle grooves can be kept consistent, so that the partition between the two needle grooves on each insert is centered, ensuring the consistency of the needle distance and the uniformity of the tightness of the knitted fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an exploded schematic diagram of Embodiment 1 of the needle plate insert structure of the computerized flat knitting machine of the present invention;

[0029] Figure 2 It is a left view of the embodiment 1 of the needle plate insert structure of the computerized flat knitting machine of the present invention;

[0030] Figure 3 It is a right side view of the embodiment 1 of the needle plate insert structure of the computerized flat knitting machine of the present invention;

[0031] Figure 4 It is an exploded schematic diagram of Embodiment 2 of the needle plate insert structure of the computerized flat knitting machine of the present invention;

[0032] Figure 5 It is a stereogram of the front half of Example 2;

[0033] Figure 6 It is a three-dimensional diagram of the second half of the sheet of Example 2;

[0034] Figure 7 This is a combined stereogram of inlay 1 and inlay 3 of Example 2;

[0035] Figure 8 This is a combined stereogram of the inlay 2 and the inlay 4 of Example 2;

[0036] Fig. 9 It is a left view of the embodiment 2 of the needle plate insert structure of the computerized flat knitting machine of the present invention;

[0037] Fig.10 It is a right view of embodiment 2 of the needle plate insert structure of the computer flat knitting machine of the present invention.

[0038] In the above drawings, 10, clip; 20, left guard; 30, right guard; 13, needle groove one; 14, needle groove two; 100, front half; 200, back half; 300, inlay one; 400, inlay two; 500, inlay three; 600, inlay four; 110, rear protrusion; 210, front recess; 310, upper recess one; 510, lower recess one; 350, groove one; 410, upper recess two; 610, lower recess two; 460, groove two; 111, main body; 112, semicircular protrusion one; 113, semicircular protrusion two; 211, semicircular recess one; 212, semicircular recess two; 320, convex heel one; 520, convex heel two; 530, first protrusion; 420, convex heel three; 620, convex heel four; 640, second protrusion. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-10 The technical solutions in the present invention are further illustrated by the accompanying drawings and embodiments. Example

[0040] like Figure 1-3 As shown, the present invention includes a clip 10, a left protective plate 20, and a right protective plate 30. The left protective plate 20 and the right protective plate 30 are respectively welded on the left and right side surfaces of the clip 10. The left protective plate 20 is provided with a groove 350 extending from its front end opening to the rear end. The groove 350 and the left side surface of the clip 10 constitute a needle groove 13 for accommodating a knitting needle. The right protective plate 20 is provided with a groove 2 460 extending from its front end opening to the rear end. The groove 2 460 and the right side surface of the clip 10 constitute a needle groove 2 14 for accommodating another knitting needle. The two knitting needles move forward and backward in the axial direction of the needle groove 1 13 and the needle groove 2 14 through two openings respectively. The clip 10, the left protective plate 20 and the right protective plate 30 are each an integrally formed plate with equal length. When the knitting needles are not involved in knitting, the two knitting needles are respectively hidden in the needle groove 1 13 and the needle groove 14. When the knitting needles are involved in knitting, the knitting needles extend out of the needle groove 1 13 and the needle groove 2 14. The present invention is also applicable to glove jacquard machines.

[0041] The combined processing technology of the needle plate insert structure of the computer flat knitting machine matched therewith comprises the following steps:

[0042] ① Use different dies to punch out the three steel strips on a vertical punching bed to obtain the blanks of the clip, the left guard and the right guard respectively;

[0043] ②Level the three blanks on a leveling machine;

[0044] ③First, use a welding fixture to clamp the clip, left guard plate, and right guard plate together according to the position relationship required for assembly, and then use a spot welding machine to spot weld the left guard plate and the right guard plate on the left and right sides of the clip respectively;

[0045] ④ Grind and polish the welded insert blank on a grinding and polishing machine;

[0046] ⑤ Check the flatness of the insert blanks and remove those that do not meet the flatness requirements. Example

[0047] like Figure 4-Figure 9 As shown, the present invention includes a clip 10, a left protective plate 20, and a right protective plate 30. The clip 10 includes a front half 100 and a rear half 200 spliced ​​together. The left protective plate 20 includes an inlay 1 300 and an inlay 3 500 spliced ​​up and down. The right protective plate 30 includes an inlay 2 400 and an inlay 4 600 spliced ​​up and down. The rear end of the front half 100 is provided with a rear protrusion 110, and the front end of the rear half 200 is provided with a front notch 210 that fits with the rear protrusion 110. The rear protrusion 110 and the front notch 210 are spliced ​​together. The inner side of the inlay 1 300 is spot welded to the front half 1 00, the inner side of the second inlay 400 is spot welded to the upper right side of the front half 100, the first inlay 300 and the second inlay 400 are symmetrical with the front half 100 as the reference, the inner side of the third inlay 500 is spot welded to the lower left side of the front half 100, the inner side of the fourth inlay 600 is spot welded to the lower right side of the front half 100, the third inlay 500 and the fourth inlay 600 are symmetrical with the front half 100 as the reference, the bottom of the first inlay 300 is provided with an L-shaped upper notch 310, the top of the third inlay 500 is provided with an L-shaped lower notch 510, the upper notch 310 and the lower notch 510 are connected to each other. The vertical side lines of the notch 1 510 are respectively at the rear ends of the inlay 1 300 and the inlay 3 500, the vertical side lines of the upper notch 1 310 and the lower notch 1 510 are on the same axis, the lower notch 1 510 and the upper notch 1 310 are spliced ​​into a groove 1 350, the bottom of the inlay 2 400 is provided with an L-shaped upper notch 2 410, the top of the inlay 4 600 is provided with an L-shaped lower notch 2 610, the vertical side lines of the upper notch 2 410 and the lower notch 2 610 are respectively at the rear ends of the inlay 2 400 and the inlay 4 600, the vertical side lines of the upper notch 2 410 and the lower notch 2 610 are on the same axis, and the lower notch 2 The second opening 610 and the second upper notch 410 are spliced ​​into the second groove 460. The first groove 350 and the left side of the front half piece 100 constitute a needle groove 13 for accommodating one knitting needle. The second groove 460 and the right side of the front half piece 100 constitute a needle groove 2 14 for accommodating another knitting needle. The two knitting needles move forward and backward in the axial direction of the needle groove 1 13 and the needle groove 2 14 through two openings respectively. When the knitting needles are not involved in knitting, the two knitting needles are respectively retracted in the needle groove 1 13 and the needle groove 14. When the knitting needles are involved in knitting, the knitting needles extend out of the needle groove 1 13 and the needle groove 2 14. The present invention is also applicable to glove jacquard machines.

[0048] In order to further improve the overall stability of the insert connection, the adjacent edges of the insert 1 300 and the insert 3 500 are spot welded together, and the adjacent edges of the insert 2 400 and the insert 4 600 are spot welded together.

[0049] like Figure 4-Figure 6As shown, the front half piece 100 is provided with a rear protrusion 110, and the rear half piece 200 is provided with a front recess 210. The mutual fitting and splicing of the rear protrusion 110 and the front recess 210 can make the connection between the front half piece 100 and the rear half piece 200 more firmly. Preferably, the rear protrusion 110 includes a main body 111, a semicircular protrusion 1 112 and a semicircular protrusion 2 113. The main body 111 is a triangle. The semicircular protrusion 1 112 and the semicircular protrusion 2 113 are respectively arranged on the two oblique sides of the main body 111. The two side lines of the front recess 210 are also respectively provided with a semicircular recess 1 211 and a semicircular recess 212. The semicircular protrusion 1 112 and the semicircular protrusion 2 113 are respectively fitted with the semicircular recess 1 211 and the semicircular recess 212, which can further enhance the connection firmness between the front half piece 100 and the rear half piece 200.

[0050] Figure 7-Figure 10 As shown, the rear ends of the insert 1 300 and the insert 3 500 are respectively provided with a convex heel 1 320 and a convex heel 2 520, the convex heel 1 320 and the convex heel 2 520 are spliced ​​into a first protrusion 530, the first protrusion 530 and the rear protrusion 110 are consistent in shape and size, the first protrusion 530 is laser welded in the front recess 210, the rear ends of the insert 2 400 and the insert 4 600 are respectively provided with a convex heel 3 420 and a convex heel 4 620, the convex heel 3 420 and the convex heel 4 620 are spliced ​​into a second protrusion 640, the second protrusion 640 and the rear protrusion 110 are The shapes and sizes of the front and rear panels 100 and 200 are consistent, and the second protrusion 640 is laser welded in the front notch 210. The front half panel 100 and the rear half panel 200 are not firmly spliced ​​only by the rear protrusion 110 and the front notch 210, and each panel is not only welded to the front half panel 100 through its inner side, but also welded to the front notch 210 through the convex heel. Each panel plays a role of connection, indirectly connecting the front half panel 100 and the rear half panel 200, so that the front half panel 100, the rear half panel 200 and each panel are connected into a whole. In order to facilitate welding, a weld is provided between each convex heel and the adjacent edge line of the front notch of the panel 1 300, the panel 3 500, the panel 2 400 and the panel 4 600, and the gap value of the weld is 50-70 wires.

[0051] The matching computer flat knitting machine needle plate insert assembly processing technology includes the following steps:

[0052] ① Use different dies to punch out the six steel strips on a vertical punching bed, and obtain blanks of 100 for the front half, 200 for the back half, 300 for insert one, 400 for insert two, 500 for insert three, and 600 for insert four respectively;

[0053] ②Level the six blanks on a leveling machine;

[0054] ③ First, use a welding fixture to clamp the first panel 300, the second panel 400, the third panel 500, the fourth panel 600, and the front half panel 100 together according to the position relationship required for assembly, and then use a spot welding machine to spot weld each panel and the front half panel 100 together to obtain a combined panel;

[0055] ④ First, use a welding fixture to clamp the rear half sheet 200 and the combined sheet obtained in step ③ together, then spot weld the adjacent edges of the first inlay 300 and the third inlay 500 together, spot weld the adjacent edges of the second inlay 400 and the fourth inlay 600 together, and then weld the convex heels and the front concave grooves 210 on each inlay together using a laser welding machine;

[0056] ⑤ Grind and polish the welded insert blank on a grinding and polishing machine;

[0057] ⑥ Check the flatness of the insert blanks and remove those that do not meet the flatness requirements.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. The needle plate insert structure of the computer flat knitting machine is characterized by: The invention comprises a clip (10), a left protective plate (20), and a right protective plate (30), wherein the left protective plate (20) and the right protective plate (30) are respectively welded to the left and right side surfaces of the clip (10), the left protective plate (20) is provided with a groove 1 (350) extending from the front end opening to the rear end, the groove 1 (350) and the left side surface of the clip (10) constitute a needle groove 1 (13) for accommodating a knitting needle, the right protective plate (20) is provided with a groove 2 (460) extending from the front end opening to the rear end, the groove 2 (460) and the right side surface of the clip (10) constitute a needle groove 2 (14) for accommodating another knitting needle, and the two knitting needles move forward and backward in the axial direction of the needle groove 1 (13) and the needle groove 2 (14) respectively through the two openings; The clip (10) comprises a front half piece (100) and a rear half piece (200) which are spliced ​​together front and back, the left protective plate (20) comprises an inlay piece 1 (300) and an inlay piece 3 (500) which are spliced ​​together up and down, and the right protective plate (30) comprises an inlay piece 2 (400) and an inlay piece 4 (600) which are spliced ​​together up and down, the rear end of the front half piece (100) is provided with a rear protrusion (110), the front end of the rear half piece (200) is provided with a front recess (210) which fits with the rear protrusion (110), the rear protrusion (110) and the front recess (210) are spliced ​​together, the inner side surface of the inlay piece 1 (300) and the inner side surface of the inlay piece 3 (500) are respectively welded to the upper and lower sides of the left side surface of the front half piece (100), the inner side surfaces of the inlay piece 2 (400) and the inlay piece 4 (600) are respectively welded to the upper and lower sides of the right side surface of the front half piece (100), and the inlay piece The first panel (300) and the third panel (500) enclose a groove first (350), the second panel (400) and the fourth panel (600) enclose a groove second (460), the groove first (350) and the left side of the front half panel (100) form a needle groove first (13) for accommodating one knitting needle, the groove second (460) and the right side of the front half panel (100) form a needle groove second (14) for accommodating another knitting needle, The rear ends of the insert piece 1 (300), the insert piece 2 (400), the insert piece 3 (500) and the insert piece 4 (600) are respectively provided with a convex heel 1 (320), a convex heel 3 (420), a convex heel 2 (520) and a convex heel 4 (620); the convex heel 1 (320), the convex heel 3 (420), the convex heel 2 (520) and the convex heel 4 (620) are all spliced ​​with the front notch (210) and welded together.

2. The needle plate insert structure of the computerized flat knitting machine according to claim 1, characterized in that: The inlay one (300) and the inlay three (500) are welded to each other, and the inlay two (400) and the inlay four (600) are welded to each other.

3. The needle plate insert structure of the computerized flat knitting machine according to claim 1, characterized in that: The convex heel one (320) and the convex heel two (520) are spliced ​​into a first protrusion (530), and the first protrusion (530) and the rear protrusion (110) are consistent in shape and size. The convex heel three (420) and the convex heel four (620) are spliced ​​into a second protrusion (640), and the second protrusion (640) and the rear protrusion (110) are consistent in shape and size.

4. The needle plate insert structure of a computerized flat knitting machine according to claim 1, characterized in that: The rear protrusion (110) comprises a main body (111), a semicircular protrusion 1 (112) and a semicircular protrusion 2 (113); the main body (111) is triangular; the semicircular protrusion 1 (112) and the semicircular protrusion 2 (113) are respectively arranged on two oblique sides of the main body (111); the two side lines of the front recess (210) are also respectively provided with a semicircular recess 1 (211) and a semicircular recess 2 (212); the semicircular protrusion 1 (112) and the semicircular protrusion 2 (113) are respectively matched with the semicircular recess 1 (211) and the semicircular recess 2 (212).

5. The combined processing technology of the needle plate insert structure of the computer flat knitting machine according to any one of claims 1 to 4, comprising the following steps: ① Six steel strips are punched out using different dies on a vertical punching machine to obtain blanks of the front half sheet (100), the rear half sheet (200), insert one (300), insert two (400), insert three (500), and insert four (600); ②Level the six blanks on a leveling machine; ③ First, use a welding fixture to clamp the first inlay (300), the second inlay (400), the third inlay (500), the fourth inlay (600), and the front half piece (100) together according to the position relationship required for assembly, and then use a spot welding machine to spot weld each inlay and the front half piece (100) together to obtain a combined piece; ④ First, the rear half sheet (200) is clamped together with the combined sheet obtained in step ③ by a welding fixture, and then the adjacent edges of the first inlay (300) and the third inlay (500) are spot welded together, and the adjacent edges of the second inlay (400) and the fourth inlay (600) are spot welded together, and then the convex heels and the front concave grooves (210) on each inlay are welded together by a laser welding machine; ⑤ Grind and polish the welded insert blank on a grinding and polishing machine; ⑥ Check the flatness of the insert blanks and remove those that do not meet the flatness requirements.

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