A random terry pattern knitting device for a seamless underwear machine

Abstract

The invention discloses a random terry pattern knitting device for a seamless underwear machine, which aims to retain all the components at the position of the original first arc wave crest longitudinal line to form a first needle selection area, the core components are the first needle selection triangle, the first needle selector, the loop collection triangle, the needle shrinking triangle, the first needle pressing triangle and the first eyebrow triangle, in a buried needle or non-buried needle state, so that the yarn reaches the loop withdrawal height, and a jacquard or non-jacquard structured yarn is realized; all the components at the position of the second arc wave crest longitudinal line are added to form a second needle selection area, the core components are the second needle selection triangle, the second needle selector, the second needle pressing triangle and the second eyebrow triangle, in a semi-buried needle state, so that the yarn does not reach the loop withdrawal height, the knitting needles eat the terry yarn to form terry, and the terry knitting function is realized; wherein the second needle selector intervenes to select which jacquard pieces and knitting needles to form terry or not, and finally realizes any terry pattern.

Description

Technical Field

[0001] The invention relates to the technical field of seamless underwear machines, in particular to a random terry pattern knitting device for seamless underwear machines. Background Art

[0002] The terry structure is composed of a plain stitch loop and a terry loop with an elongated sinker loop. It is generally woven from two yarns, one of which is the face yarn woven into a plain stitch loop, and the other is the terry yarn woven with a terry loop.

[0003] In the process of weaving underwear, when a terry knitting style is required, a number of knitting needles arranged in a ring above the needle cylinder generally move up and down longitudinally along the outer circumference of the needle cylinder. The jacquard piece provides power for the longitudinal up and down movement of the knitting needles. The longitudinal up and down movement of the jacquard piece is guided by the jacquard piece track groove between the jacquard piece upper track and the jacquard piece lower track. The knitting needles are also affected by the tucking cam, the needle shrinking cam and the first needle pressing cam to bury the needle or not bury the needle, and cooperate with the terry-specific sinker to move horizontally back and forth toward the center of the needle cylinder under the action of the sinker cover. The horizontal back and forth movement of the sinker is guided by the sinker piece track groove on the sinker cover, so that the needle tongue and the sinker piece perform an interlaced knitting action, thereby completing the terry knitting effect.

[0004] The Chinese patent "Random Terry Machine (CN105887304B)" discloses a random terry machine, including a box body, a transmission box, a hood assembly, a rod, a bobbin platform, and a wire feed frame. A transmission box is provided on the box body, rods are provided on both sides, a bobbin platform is provided at the rear, a wire frame is provided on the upper end of the rod, and a wire feed frame is provided under the wire frame. A hood assembly that can arbitrarily adjust the movable track of the movable eyebrow is provided on the transmission box, and the hood assembly contains a hood base, a left hair knife, an inlay, a middle eyebrow, a right hair knife, a movable eyebrow, a buckle plate shaft, a rubber outer eyebrow, a square, an outer inlay, a buckle plate, an eccentric shaft, an elastic eyebrow frame, an elastic eyebrow, a door eyebrow, an elastic eyebrow frame cover, a needle selector, and a needle selector plate.

[0005] This kind of arbitrary terry production has a complex structure, high equipment production cost, and inconvenient operation. When weaving different underwear terry, it is necessary to adjust the hood parts. Since the required adjustment angle is very small and the precision requirement is very high, each adjustment often takes a long time, which affects the operating efficiency of the equipment and increases the production cost. Summary of the invention

[0006] The purpose of the present invention is to overcome the above defects of the prior art and provide a seamless underwear machine arbitrary terry pattern knitting device, which aims to retain all the components at the position of the original first arc wave crest longitudinal line to form a first needle selection area, the core components are the first needle selection triangle, the first needle selector, the loop triangle, the needle shrinking triangle, the first needle pressure triangle and the first eyebrow triangle, in the buried needle or non-buried needle state, so that the yarn reaches the retreat height, and the jacquard or non-jacquard structure of the yarn is realized; add all the components at the position of the second arc wave crest longitudinal line to form a second needle selection area, the core components are the second needle selection triangle, the second needle selector, the second needle pressure triangle and the second eyebrow triangle, in the semi-buried needle state, so that the yarn does not reach the retreat height, the knitting needles eat the terry yarn, form terry, and realize the terry knitting function; wherein the second needle selector intervenes to select which jacquard pieces and knitting needles to form terry or not, and finally realize any terry pattern.

[0007] In order to achieve the above purpose, the present invention is realized by the following technical scheme: a seamless underwear machine arbitrary terry pattern knitting device, comprising a sinker cover, a jacquard plate upper track and a jacquard plate lower track arranged from top to bottom on the needle cylinder of the seamless underwear machine, the jacquard plate lower track is composed of eight sections of repeated lower track units connected end to end, the jacquard plate upper track is composed of eight sections of repeated upper track units connected end to end, the sinker cover is provided with a sinker plate track groove arranged in a circle along its circumference, the sinker plate track groove is composed of eight sections of repeated track groove units connected end to end, the track groove unit, the upper track unit and The lower track unit corresponds to one section in the longitudinal direction from top to bottom, and a plurality of sinkers that run along the upper track are arranged in the sinker track groove, characterized in that the lower track unit is provided with a first arc crest, a first arc trough, a second arc crest and a second arc trough that protrude upward to form a plurality of continuous undulating arc segments, the first arc crest is located at the first needle selection triangle, the second arc crest is located at the second needle selection triangle, the first arc trough is located between the first needle selection triangle and the second needle selection triangle, the second arc trough is located between the two lower track units, and the second arc crest is lower than the first arc crest. The first arc wave crest, the upper track unit is provided with a continuous undulating arc segment protruding downward to form a complementary continuous undulating arc segment on the lower track unit, that is, a jacquard plate track groove with an equal width curve is formed between the upper track unit and the lower track unit, and a plurality of jacquard plates are arranged in the jacquard plate track groove along the upper track thereof. The outer side between the upper track unit and the lower track unit is provided with a first needle selector and a second needle selector, the first needle selector corresponds to the longitudinal line where the starting position of the upslope arc segment of the first arc wave crest is located, and the second needle selector corresponds to the longitudinal line where the starting position of the upslope arc segment of the second arc wave crest is located. On the longitudinal line, the upper end of each jacquard piece corresponds to a knitting needle, and the knitting needle is located between the track groove unit and the upper track unit. A pair of first protrusions and second protrusions separated by intervals are arranged in the track groove unit. The protrusion direction of the first protrusion and the second protrusion is pushed outward from the inner side of the horizontal direction of the scimitar cover. The position of the first protrusion is the first eyebrow triangle, and the first eyebrow triangle corresponds to the longitudinal line where the trough of the first arc trough is located. The position of the second protrusion is the second eyebrow triangle, and the second eyebrow triangle corresponds to the longitudinal line where the trough of the second arc trough is located.

[0008] The present invention divides a needle selection and knitting unit into a first needle selection area and a second needle selection area. The first needle selection area is composed of all components at the position of the first arc wave crest longitudinal line, and the second needle selection area is composed of all components at the position of the second arc wave crest longitudinal line. The corresponding first needle selection area is provided with a loop withdrawal height (i.e., the first arc wave crest) on the first needle selection triangle. The loop withdrawal height acts on the jacquard piece running on its track to push the knitting needle to rise to the loop withdrawal position. The first knitting needle triangle is provided with a tuck triangle, a needle narrowing triangle and a first needle pressing triangle in sequence; the second needle selection area is provided with a terry loop height (i.e., the second arc wave crest) on the second needle selection triangle. The terry loop height acts on the jacquard piece running on its track to push the knitting needle to rise to the position where the needle tongue is opened but the old yarn is not separated from the needle tongue, and the knitting needle hooks the new yarn again, and a second needle pressing triangle is provided on the second knitting needle triangle.

[0009] The first needle selection area and the second needle selection area are arranged in a needle selection knitting unit, so that loops can be made in each knitting system, so that any pattern formed by the loops can be obtained; the loop withdrawal height on the first needle selection triangle makes it possible for the jacquard piece running along the track of the first needle selection triangle to push the knitting needle to rise along the track to hook the surface yarn under the action of the first needle selector, and then lower it to the fully buried needle state; the loop formation height on the second needle selection triangle makes it possible for the jacquard piece running along the track of the second needle selection triangle to push the knitting needle to rise to a position where it can hook the loop yarn under the action of the second needle selector; The knitting needle running along the track of the second needle selection triangle under the action of the second needle selector hooks the face yarn under the action of the first needle selection triangle, rises to the position where the needle tongue opens but the face yarn thread does not leave the needle tongue under the action of the second needle selection triangle, and the knitting needle hooks the terry yarn again; the knitting needle running along the track of the first needle selection triangle under the action of the first needle selector, but the knitting needle that cannot run along the track of the second needle selection triangle is pushed back to the needle cylinder by the action of the second needle selector, hooks the face yarn only when passing through the first needle selection area, and does not hook the terry yarn when passing through the second needle selection area, and forms terry yarn at the position where the terry yarn is not hooked.

[0010] Preferably, a leading arc crest of an undulating arc segment is arranged on the upslope arc segment of the first arc crest, and the second arc crest is at the same height as the leading arc crest.

[0011] Preferably, a gathering triangle, a narrowing triangle, a first pressing triangle and a second pressing triangle are arranged on the outer side between the track groove unit and the upper track unit, the gathering triangle corresponds to the longitudinal line where the leading arc wave crest is located, the narrowing triangle corresponds to the longitudinal line where the crest of the first arc wave crest is located, the first pressing triangle corresponds to the longitudinal line where the end point position of the downslope arc segment of the first arc wave crest is located, and the second pressing triangle corresponds to the longitudinal line where the end point position of the downslope arc segment of the second arc wave crest is located.

[0012] The tuck cam is a radially rotating structure around the needle cylinder. When it rotates to the high position, the knitting needle rises to the tuck height along the tuck cam. When it rotates to the low position, the knitting needle moves horizontally. When the tuck cam rotates to the high position and the jacquard piece is pushed back to the needle cylinder by the first needle selection cam, the knitting needle on the jacquard piece rises to the tuck height along the tuck cam and hooks the lining yarn to form a jacquard pattern.

[0013] Preferably, a first eyebrow knife triangle is arranged in the track groove unit at a position diagonally opposite to the downslope arc section of the first protrusion, and the upslope arc section of the first eyebrow knife triangle confronts the downslope arc section of the first protrusion to form a first circle-forming station, and a second eyebrow knife triangle is arranged in the track groove unit at a position diagonally opposite to the downslope arc section of the second protrusion, and the upslope arc section of the second eyebrow knife triangle confronts the downslope arc section of the second protrusion to form a second circle-forming station.

[0014] The first needle selection area corresponds to the first protrusion provided at the first eyebrow triangle looping position of the sinker cover, and the second needle selection area corresponds to the second protrusion provided at the second eyebrow triangle looping position of the sinker cover. Under the action of the track of the eyebrow triangle, the heel of the sinker moves away from the rotation center of the needle cylinder at the first protrusion to assist the knitting needle to loop at this position, and moves away from the rotation center of the needle cylinder at the second protrusion to assist the knitting needle to loop at this position.

[0015] A first eyebrow knife triangle is arranged outside the first protrusion of the eyebrow triangle in the sinker cover, and a second eyebrow knife triangle is arranged outside the second protrusion of the eyebrow triangle in the sinker cover. Under the action of the power device, the pressure contact surface of the first eyebrow knife triangle contacts the heel of the sinker, pushing the sinker toward the rotation center of the needle cylinder to prepare for the next needle raising; and under the action of the power device, the pressure contact surface of the second eyebrow knife triangle contacts the heel of the sinker, pushing the sinker toward the rotation center of the needle cylinder to prepare for the next needle raising.

[0016] Beneficial effects: (1) The structure added by the present invention is simple and easy to install; no adjustment of any parts is required during use, and the invention has a built-in terry weaving function, which is simple to operate and easy to manage.

[0017] (2) The present invention can freely choose whether to form a terry loop or not, thereby realizing the knitting function of any terry loop pattern. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the jacquard plate upper track and the jacquard plate lower track of the present invention;

[0020] Figure 3 It is a schematic diagram of the development of the needle selection and knitting unit of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the reverse side of the Sinking Cover of the present invention;

[0022] Figure 5 for Figure 4 A magnified view of the structure of part A.

[0023] In the figure: 1-jacquard piece lower track, 2-jacquard piece upper track, 3-sink cover, 4-sink piece track groove, 5-sink piece, 6-first needle selection triangle, 7-second needle selection triangle, 8-first arc peak, 9-second arc peak, 10-first arc trough, 11-second arc trough, 12-front arc peak, 13-jacquard piece, 14-first needle selector, 15-second needle selector, 16-knitting needle, 17-tuck loop Triangle, 18-needle closing triangle, 19-first needle pressing triangle, 20-second needle pressing triangle, 21-first eyebrow triangle, 22-second eyebrow triangle, 23-first protrusion, 24-second protrusion, 25-first eyebrow knife triangle, 26-second eyebrow knife triangle, 27-lower heel, 28-jacquard piece teeth, 29-upper heel, 30-needle butt, 31-piece jaw, 32-piece throat, 33-piece nose, 34-piece heel. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features and objectives of the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0025] Example: Figure 1 As shown, a random terry pattern knitting device for a seamless underwear machine comprises a sinker cover 3, a jacquard piece upper track 2 and a jacquard piece lower track 1 which are arranged on the needle cylinder of the seamless underwear machine from top to bottom, the jacquard piece lower track 1 is composed of eight sections of repeated lower track units connected end to end, the jacquard piece upper track 2 is composed of eight sections of repeated upper track units connected end to end, the sinker cover 3 is provided with a sinker piece track groove 4 which is arranged in a circle along the circumference thereof, the sinker piece track groove 4 is composed of eight sections of repeated track groove units connected end to end, a plurality of sinkers 5 which run along the upper track are arranged in the sinker piece track groove 4, and the sinker piece 5 has a throat 32, a jaw 31, a nose 33 and a heel 34. The track groove unit, the upper track unit and the lower track unit are arranged in a corresponding manner along the longitudinal section from top to bottom to form a needle selection knitting unit, that is, a needle selection knitting unit includes the track groove unit, the upper track unit and the lower track unit which are arranged in a corresponding manner along the longitudinal section from top to bottom.

[0026] like Figure 2 and Figure 3As shown, the lower track unit is provided with a first arc crest 8, a first arc trough 10, a second arc crest 9 and a second arc trough 11 that protrude upward to form a plurality of continuous undulating arc segments, the first arc crest 8 is located at the first needle selection triangle 6, the second arc crest 9 is located at the second needle selection triangle 7, the first arc trough 10 is located between the first needle selection triangle 6 and the second needle selection triangle 7, the second arc trough 11 is located between the two lower track units, a leading arc crest 12 of an undulating arc segment is arranged on the upslope arc segment of the first arc crest 8, the second arc crest 9 is lower than the first arc crest 8 but is at the same height as the leading arc crest 12, the upper track unit is provided with a continuous undulating arc segment that protrudes downward to form a complementary continuous undulating arc segment on the lower track unit, that is, a jacquard piece track groove with an equal width curve is formed between the upper track unit and the lower track unit, a plurality of jacquard pieces 13 that detour along the upper track are arranged in the jacquard piece track groove, and the jacquard piece 13 has a lower heel 27, a jacquard piece tooth 28 and an upper heel 29.

[0027] A first needle selector 14 and a second needle selector 15 are arranged on the outer side between the upper track unit and the lower track unit. The first needle selector 15 corresponds to the longitudinal line where the starting position of the uphill arc segment of the first arc wave crest 8 is located, and the second needle selector 15 corresponds to the longitudinal line where the starting position of the uphill arc segment of the second arc wave crest 9 is located. The upper end of each jacquard piece 13 corresponds to a knitting needle 16, which is located between the track groove unit and the upper track unit, and has a needle butt 30.

[0028] The outer side between the track groove unit and the upper track unit is provided with a tuck triangle 17, a narrowing triangle 18, a first pressing triangle 19 and a second pressing triangle 20. The tuck triangle 17 corresponds to the longitudinal line where the leading arc wave crest 12 is located, the narrowing triangle 18 corresponds to the longitudinal line where the crest of the first arc wave crest 8 is located, the first pressing triangle 19 corresponds to the longitudinal line where the end point of the downslope arc segment of the first arc wave crest 8 is located, and the second pressing triangle 20 corresponds to the longitudinal line where the end point of the downslope arc segment of the second arc wave crest 9 is located.

[0029] like Figure 4 and Figure 5As shown, a pair of first protrusions 23 and second protrusions 24 are arranged with a spacing apart, and the protrusion direction of the first protrusion 23 and the second protrusion 24 is pushed outward from the inner side of the scissor cover 3 in the horizontal direction, and the first protrusion 23 is located at the first eyebrow triangle 21, and the first eyebrow triangle 21 corresponds to the longitudinal line where the trough of the first arc trough 110 is located, and the second protrusion 24 is located at the second eyebrow triangle 22, and the second eyebrow triangle 22 corresponds to the longitudinal line where the trough of the second arc trough 11 is located, and a first eyebrow knife triangle 25 is arranged at the diagonally opposite side of the downslope arc section of the first protrusion in the track groove unit, and the upslope arc section of the first eyebrow knife triangle 25 confronts the downslope arc section of the first protrusion 23 to form a first circle forming station, and a second eyebrow knife triangle 26 is arranged at the diagonally opposite side of the downslope arc section of the second protrusion 24 in the track groove unit, and the upslope arc section of the second eyebrow knife triangle 26 confronts the downslope arc section of the second protrusion 24 to form a second circle forming station,

[0030] Usage: When the needle cylinder of the underwear machine rotates and passes through the first needle selection triangle, under the action of the first needle selector, the lower heel of the jacquard piece running along the track of the first needle selection triangle moves along the track contact surface, and pushes the knitting needle on the jacquard piece to move up and down according to the track height of the first needle selection triangle. In this process, the knitting needle hooks the surface yarn and passes through the needle collection triangle, and drops to the fully buried needle state under the action of the first needle pressure triangle. At the same time, the heel of the sinker piece runs along the arc track of the first eyebrow triangle. When the knitting needle loops and drops to the fully buried needle state, the sinker piece is at the first raised position, and the sinker piece moves radially to the farthest distance from the rotation center of the needle cylinder. In this process, the sinker piece assists the knitting needle to complete the looping action at the first looping station under the action of the throat, jaw and nose of the piece. Subsequently, the first eyebrow knife triangle is pushed by the power mechanism to make the heel of the sinker piece contact with the first eyebrow knife triangle, and move radially toward the rotation center of the needle cylinder to assist the knitting needle to prepare for the next needle start.

[0031] When the needle cylinder of the underwear machine rotates and passes through the second needle selection triangle, the jacquard piece running along the track of the first needle selection triangle under the action of the first needle selector, if under the action of the second needle selector, moves along the track contact surface of the second needle selection triangle again, the jacquard piece will push the knitting needle thereon to the terry height again, the knitting needle will hook the terry yarn again while hooking the face yarn, and will be lowered to the full needle buried state under the action of the second needle pressure triangle; the jacquard piece running along the track of the first needle selection triangle under the action of the first needle selector, but the knitting needle that is pushed back to the needle cylinder by the second needle selector and fails to run along the track of the second needle selection triangle, its height remains unchanged, is in a floating line state, does not hook the terry yarn, and forms terry at the position where the terry yarn is not hooked. At the same time, the heel of the sinker moves along the arc track of the second eyebrow triangle. When the knitting needle loop is reduced to the fully buried needle state, the sinker moves radially to the farthest distance from the rotation center of the syringe at the second raised position of the second eyebrow triangle. In this process, the sinker assists the knitting needle to complete the loop withdrawal action at the eyebrow triangle looping station under the action of the throat, jaw and nose. When not making terry, the second eyebrow knife triangle is pushed by the power mechanism so that the heel of the sinker moves radially toward the rotation center of the syringe under the action of the second eyebrow knife triangle pressure contact surface of the second eyebrow knife triangle, assisting the knitting needle to prevent the coil on the needle from coming up and running onto the nose of the sinker when the needle is buried. When making terry, the second eyebrow knife triangle does not push in the radial direction of the syringe.

[0032] The tuck cam in the first needle selection area can rotate along the radial direction of the needle cylinder driven by the motor. When the tuck cam rotates to the high position, the inclined track formed on its upper surface can make the needle butt of the knitting needle rise along the inclined surface. When the jacquard piece is pushed back to the needle cylinder by the action of the first needle selection cam, the knitting needle on the jacquard piece will rise to the tuck height along the tuck cam and hook the inner yarn set at this position, so as to weave a jacquard pattern.

[0033] According to the above, an m-n type terry pattern can be made according to knitting needs, where m represents the number of needles selected by the first needle selector and the second needle selector in sequence, and n represents the number of needles selected only by the first needle selector but not by the second needle selector.

Claims

1. A random terry pattern knitting device for a seamless underwear machine, comprising a sinker cover, a jacquard piece upper track and a jacquard piece lower track arranged on a needle cylinder of the seamless underwear machine from top to bottom, wherein the jacquard piece lower track is composed of eight sections of repeated lower track units connected end to end, and the jacquard piece upper track is composed of eight sections of repeated upper track units connected end to end, and the sinker cover is provided with a sinker piece track groove arranged along its circumference, and the sinker piece track groove is composed of eight sections of repeated track groove units connected end to end, and the track groove unit, the upper track unit and the lower track unit correspond to each other one section to one section from top to bottom in the longitudinal direction, and a plurality of sinkers are arranged in the sinker piece track groove to go around along its upper track, characterized in that: The lower track unit is provided with a first arc peak, a first arc trough, a second arc peak and a second arc trough which protrude upward to form a plurality of continuous undulating arc segments, the first arc peak is located at the first needle selection triangle, the second arc peak is located at the second needle selection triangle, the first arc trough is located between the first needle selection triangle and the second needle selection triangle, the second arc trough is located between the two lower track units, the second arc peak is lower than the first arc peak, the upper track unit is provided with a continuous undulating arc segment which protrudes downward to form a complementary continuous undulating arc segment on the lower track unit, that is, a jacquard piece track groove with an equal width curve is formed between the upper track unit and the lower track unit, a plurality of jacquard pieces which detour along its upper track are arranged in the jacquard piece track groove, and a plurality of jacquard pieces which detour along its upper track are arranged on the outer side between the upper track unit and the lower track unit. A first needle selector and a second needle selector, the first needle selector corresponds to the longitudinal line where the starting position of the upslope arc segment of the first arc wave crest is located, and the second needle selector corresponds to the longitudinal line where the starting position of the upslope arc segment of the second arc wave crest is located, and the upper end of each jacquard piece corresponds to a knitting needle, and the knitting needle is located between the track groove unit and the upper track unit, and a pair of first protrusions and second protrusions separated by intervals are arranged in the track groove unit, and the protrusion direction of the first protrusion and the second protrusion is pushed outward from the inner side of the horizontal direction of the scissor cover, the first protrusion is located at the first eyebrow triangle, and the first eyebrow triangle corresponds to the longitudinal line where the trough of the first arc wave trough is located, and the second protrusion is located at the second eyebrow triangle, and the second eyebrow triangle corresponds to the longitudinal line where the trough of the second arc wave trough is located.

2. The random terry pattern knitting device for seamless underwear machine according to claim 1, characterized in that: A leading arc crest of an undulating arc segment is arranged on the upslope arc segment of the first arc crest, and the second arc crest is at the same height as the leading arc crest.

3. The random terry pattern knitting device for seamless underwear machine according to claim 2, characterized in that: A tuck cam, a narrowing cam, a first pressing cam and a second pressing cam are arranged on the outer side between the track groove unit and the upper track unit. The tuck cam corresponds to the longitudinal line where the leading arc wave crest is located, the narrowing cam corresponds to the longitudinal line where the crest of the first arc wave crest is located, the first pressing cam corresponds to the longitudinal line where the end point position of the downslope arc segment of the first arc wave crest is located, and the second pressing cam corresponds to the longitudinal line where the end point position of the downslope arc segment of the second arc wave crest is located.

4. The random terry pattern knitting device for seamless underwear machine according to claim 1, 2 or 3, characterized in that: A first eyebrow knife triangle is arranged in the track groove unit at a position diagonally opposite to the downslope arc section of the first protrusion, and the upslope arc section of the first eyebrow knife triangle confronts the downslope arc section of the first protrusion to form a first circle-forming station; a second eyebrow knife triangle is arranged in the track groove unit at a position diagonally opposite to the downslope arc section of the second protrusion, and the upslope arc section of the second eyebrow knife triangle confronts the downslope arc section of the second protrusion to form a second circle-forming station.

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