阅读说明：本技术 一种便于精准对接的汽车顶板塑料配件生产用包边装置 (Edge covering device convenient for production of automobile roof plastic accessories and capable of being accurately butted ) 是由 张峻涛 于 2021-03-02 设计创作，主要内容包括：本发明公开了一种便于精准对接的汽车顶板塑料配件生产用包边装置,包括包边装置主体、固定桶、伺服电机和推块,所述包边装置主体的顶部安装有第一液压杆,且第一液压杆的底部设置有顶板主体,并且顶板主体的底面设置有固定桶,所述包边装置主体的内部设置有固定板,且固定板的底部安装有刀模。该便于精准对接的汽车顶板塑料配件生产用包边装置,在第一液压杆的底部安装有顶板主体,在对顶棚进行包边时,顶板主体会带动底部的固定桶进行下降,使得固定桶带动顶块对包边材料进行挤压,从而使得包边材料与顶棚的内部贴合的更加紧密,避免包边材料在贴合时会出现褶皱的现象,从而降低废品率,提高产品质量。(The invention discloses an edge covering device convenient for production of plastic accessories of an automobile roof in accurate butt joint, which comprises an edge covering device main body, a fixing barrel, a servo motor and a push block, wherein a first hydraulic rod is installed at the top of the edge covering device main body, the bottom of the first hydraulic rod is provided with a roof main body, the bottom surface of the roof main body is provided with the fixing barrel, a fixing plate is arranged inside the edge covering device main body, and the bottom of the fixing plate is provided with a cutting die. This device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint, install the roof main part in the bottom of first hydraulic stem, when borduring to the ceiling, the roof main part can drive the fixed bucket of bottom and descend for fixed bucket drives the kicking block and extrudees the material of borduring, thereby make the inside laminating of the material of borduring and ceiling inseparabler, avoid the phenomenon that the fold can appear when the laminating of the material of borduring, thereby reduce the rejection rate, improve product quality.)

1. The utility model provides a device of borduring is used in production of roof plastic accessories convenient to accurate butt joint, includes device main part (1) of borduring, fixed bucket (4), servo motor (14) and ejector pad (25), its characterized in that: the edge covering device is characterized in that a first hydraulic rod (2) is installed at the top of a main body (1) of the edge covering device, a top plate main body (3) is arranged at the bottom of the first hydraulic rod (2), a fixing barrel (4) is arranged on the bottom surface of the top plate main body (3), the inside of the fixing barrel (4) is connected with a supporting rod (6) through a telescopic spring (5), the bottom of the supporting rod (6) is connected with a top block (8) through a torsion spring (7), a fixing plate (9) is arranged inside the main body (1) of the edge covering device, a cutting die (10) is installed at the bottom of the fixing plate (9), an edge covering material (11) is arranged under the cutting die (10), the inside of the main body (1) of the edge covering device is connected with a workbench (13) through a second hydraulic rod (12), the top of a servo motor (14) is connected with a main shaft (15), and the surface of the main shaft (15) is connected with a reverse ratchet wheel (16), the surface of a reverse ratchet wheel (16) is connected with a reciprocating screw rod (21) through a first pulley group (19), the outer surface of the reciprocating screw rod (21) is connected with a fixing mechanism (30) through a nut (20), a glue spraying device (32) is installed on the fixing mechanism (30), a servo motor (14) is connected with a forward ratchet wheel (22) through a spindle (15), the surface of the forward ratchet wheel (22) is connected with a connecting rod (24) through a second pulley group (23), a push block (25) is arranged at the top of the connecting rod (24), the surface of the push block (25) is in contact with the inside of a power gear (26), the surface of the power gear (26) is connected with a fixed bolt (28) through a tooth angle (27), the bottom of the fixed bolt (28) is connected with the fixing mechanism (30) through a return spring (29), and a hollow installation boss (33) is arranged at one end, close to the inner wall of the fixing mechanism (30), of the power gear (26), the mounting boss (33) is rotatably mounted on the inner side wall of the fixing mechanism (30) through a bearing (34), the surface of the power gear (26) is connected with the driven gear (31), and the middle part of the driven gear (31) is connected with the glue spraying device (32).

2. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: the first hydraulic rods (2) are symmetrically distributed at the top of the edge covering device main body (1), the bottom of the first hydraulic rods (2) is fixedly connected with the top plate main body (3), the fixing barrels (4) are distributed at equal intervals at the bottom of the top plate main body (3), and meanwhile the distribution area of the fixing barrels (4) is the same as the area of slotted holes in the fixing plate (9).

3. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: fixed bucket (4) are sleeve structure with bracing piece (6), and bracing piece (6) constitute extending structure through expanding spring (5) and fixed bucket (4) to bracing piece (6) constitute revolution mechanic through torsional spring (7) and kicking block (8), and the top of kicking block (8) is glossy circular-arc simultaneously.

4. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: the servo motor (14) is positioned in the edge covering device main body (1), the servo motor (14) and the ratchet (17) form a rotating structure through the main shaft (15) and the supporting spring (18), and the ratchet (17) is distributed on the main shaft (15) at equal angles.

5. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: the top of the ratchet (17) is mutually attached to the inner wall of the reverse ratchet wheel (16), the inner wall of the reverse ratchet wheel (16) is an inclined notch which is arranged at an equal angle, and the reverse ratchet wheel (16) and the reciprocating screw rod (21) form a linkage structure through a first pulley group (19).

6. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: the reciprocating screw rod (21) and the nut (20) form threaded connection, the nut (20) and the fixing mechanism (30) form an integrated structure through a connecting block, the fixing mechanism (30) and the glue spraying device (32) are in rotary connection, and the glue spraying device (32) is located right above the workbench (13).

7. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: the inside of the forward ratchet wheel (22) is opposite to the inside of the reverse ratchet wheel (16), the forward ratchet wheel (22) and the connecting rod (24) form a rotating structure through the second pulley set (23), and push blocks (25) are symmetrically distributed at the top of the connecting rod (24).

8. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: the push block (25) is located inside the power gear (26), circular arc-shaped convex blocks are symmetrically arranged inside the power gear (26), the power gear (26) is meshed with the driven gear (31), and meanwhile the driven gear (31) and the glue spraying device (32) are fixed in a welding mode.

9. The device of borduring is used in production of auto roof plastic accessories convenient to accurate butt joint of claim 1 characterized in that: the tooth angle (27) is arranged on the outer side of the power gear (26) in an equal angle mode, the top of the tooth angle (27) is arranged in an inclined mode, the tooth angle (27) is mutually clamped with the fixing bolt (28), and the bottom of the fixing bolt (28) forms a telescopic structure with the fixing mechanism (30) through the return spring (29).

Technical Field

The invention relates to the technical field of automobile part production, in particular to a hemming device for automobile roof plastic part production, which is convenient for accurate butt joint.

Background

Auto-parts processing is the product that constitutes each unit of auto-parts processing whole and serve auto-parts processing, adds man-hour to the accessory and needs the ceiling of car to bordure the processing simultaneously, and the process of borduring needs to bordure by hand at present to comparative delay time makes the mode work load of borduring great, and intensity of labour is high, and work efficiency is low, consequently needs the device of borduring of roof main part plastic accessories production, but the device of borduring of roof main part plastic accessories production common in the existing market still has the following problem:

1. when edge covering is carried out, spraying work needs to be carried out on the ceiling of the edge covering, the manual spraying time is long, and meanwhile, glue is not uniformly coated due to the manual spraying, so that edge covering and pasting work is inconvenient to carry out in subsequent work;

2. when borduring to the ceiling, because of the inside of ceiling is irregular shape for when borduring, pressing that can not be even, make the phenomenon of fold can appear in the cutting amount of borduring, thereby can influence product quality, make the rejection rate increase.

Therefore, the edge covering device for producing the plastic fittings of the automobile roof is convenient to accurately butt joint, and the problems provided in the above are solved.

Disclosure of Invention

The invention aims to provide an edge covering device for producing plastic accessories of an automobile roof, which is convenient for accurate butt joint, and aims to solve the problems that the edge covering device for producing plastic accessories of automobile roof main bodies in the prior market needs to spray an edge-covered ceiling during edge covering, the manual spraying time is long, the manual spraying can lead the glue to be unevenly coated, the edge covering and pasting work is inconvenient to carry out in subsequent work, and the edge covering cutting amount can not be uniformly pressed during edge covering due to the irregular shape of the inside of the ceiling during edge covering, so that the phenomenon of folds can be caused, the product quality can be influenced, and the rejection rate is increased.

In order to achieve the purpose, the invention provides the following technical scheme: an edge covering device convenient for production of plastic accessories of an automobile roof and capable of being accurately butted comprises an edge covering device main body, a fixing barrel, a servo motor and a push block, wherein a first hydraulic rod is installed at the top of the edge covering device main body, a roof main body is arranged at the bottom of the first hydraulic rod, the fixing barrel is arranged on the bottom surface of the roof main body, the inner part of the fixing barrel is connected with a supporting rod through a telescopic spring, the bottom of the supporting rod is connected with an ejector block through a torsion spring, a fixing plate is arranged inside the edge covering device main body, a cutting die is installed at the bottom of the fixing plate, an edge covering material is arranged under the cutting die, the inner part of the edge covering device main body is connected with a workbench through a second hydraulic rod, the top of the servo motor is connected with a main shaft, the surface of the main shaft is connected with a reverse ratchet wheel through a supporting spring, and the surface of the reverse, the surface of reciprocal lead screw is connected with fixed establishment through the nut, and installs on the fixed establishment and spout the mucilage binding and put, servo motor is connected with the forward ratchet through the main shaft, and the surface of forward ratchet is connected with the connecting rod through the second pulley group to the top of connecting rod is provided with the ejector pad, the surface and the power gear inside of ejector pad contact, and the surface of power gear is connected with the gim peg through the tooth angle, and the bottom of gim peg is connected with fixed establishment through reset spring, the power gear is close to the one end of fixed establishment inner wall is equipped with hollow installation boss, the installation boss pass through the bearing rotate install in on fixed establishment's the inside wall, just the surface of power gear is connected with driven gear to driven gear's middle part is connected with spouting the mucilage binding and put.

Preferably, the first hydraulic rods are symmetrically distributed at the top of the edge covering device main body, the bottom of each first hydraulic rod is fixedly connected with the top plate main body, the bottom of each top plate main body is provided with fixing barrels at equal intervals, and the distribution area of the fixing barrels is the same as the area of the slotted holes in the fixing plates.

Preferably, fixed bucket is the sleeve structure with the bracing piece, and the bracing piece passes through expanding spring and fixed bucket constitutes extending structure to the bracing piece passes through the torsional spring and constitutes revolution mechanic with the kicking block, and the top of kicking block is glossy circular-arc simultaneously.

Preferably, the servo motor is located inside the edge covering device main body, the servo motor forms a rotating structure through the main shaft, the supporting spring and the ratchet, and the ratchet is distributed on the main shaft at equal angles.

Preferably, the tops of the ratchets are mutually attached to the inner wall of the reverse ratchet wheel, the inner wall of the reverse ratchet wheel is an inclined notch which is arranged at an equal angle, and the reverse ratchet wheel and the reciprocating screw rod form a linkage structure through a first pulley group.

Preferably, the reciprocating screw rod and the nut form threaded connection, the nut and the fixing mechanism form an integrated structure through a connecting block, the fixing mechanism and the glue spraying device are in rotary connection, and the glue spraying device is located right above the workbench.

Preferably, the setting of the inside of forward ratchet is opposite with the inside setting direction of reverse ratchet, and forward ratchet constitutes revolution mechanic through second pulley group and connecting rod to the top symmetric distribution of connecting rod has the ejector pad.

Preferably, the push block is located inside the power gear, the power gear is symmetrically provided with arc-shaped convex blocks inside, the power gear is meshed with the driven gear, and the driven gear and the glue spraying device are welded and fixed.

Preferably, the tooth angle is arranged on the outer side of the power gear at the same angle, the top of the tooth angle is arranged obliquely, the tooth angle is mutually clamped with the fixed bolt, and the bottom of the fixed bolt and the fixed mechanism form a telescopic structure through a return spring.

Compared with the prior art, the invention has the beneficial effects that: the edge covering device for producing the automobile roof plastic fittings convenient for accurate butt joint,

1. the top plate main body is arranged at the bottom of the first hydraulic rod, and when the top shed is subjected to edge covering, the top plate main body can drive the fixed barrel at the bottom to descend, so that the fixed barrel drives the top block to extrude an edge covering material, the edge covering material is more closely attached to the inner part of the top shed, the phenomenon that the edge covering material is wrinkled during attachment is avoided, the rejection rate is reduced, and the product quality is improved;

2. have at the internally mounted of the device main part of borduring and spout mucilage binding and put for it can the round trip movement to spout the mucilage binding in the device main part of borduring, can carry out more even spraying work to the ceiling, avoids artifical spraying, improves work efficiency, and it can rotate to spout the mucilage binding simultaneously, makes and to carry out the spraying at no dead angle to the ceiling, improves the quality of spraying, makes things convenient for subsequent work of borduring.

Drawings

FIG. 1 is a schematic view of the overall front cross-sectional structure of the present invention;

FIG. 2 is a schematic view of the overall right-side cross-sectional structure of the present invention;

FIG. 3 is a schematic view of a front section connection structure of the extension spring and the support rod according to the present invention;

FIG. 4 is a schematic view of a rear view cross section connection structure of the forward ratchet wheel and the second pulley set according to the present invention;

FIG. 5 is a rear sectional view of the ratchet and the supporting spring according to the present invention;

FIG. 6 is a schematic view of a top cross-sectional connection structure of the power gear and the fixing bolt according to the present invention;

FIG. 7 is a schematic view of a rear-view cross-section connection structure of the connecting rod and the pushing block of the present invention.

In the figure: 1. a hemming device main body; 2. a first hydraulic lever; 3. a top plate main body; 4. fixing the barrel; 5. a tension spring; 6. a support bar; 7. a torsion spring; 8. a top block; 9. a fixing plate; 10. cutting the die; 11. wrapping materials; 12. a second hydraulic rod; 13. a work table; 14. a servo motor; 15. a main shaft; 16. a reverse ratchet wheel; 17. a ratchet; 18. a support spring; 19. a first pulley set; 20. a nut; 21. a reciprocating screw rod; 22. a forward ratchet; 23. a second pulley set; 24. a connecting rod; 25. a push block; 26. a power gear; 27. a tooth angle; 28. a fixing bolt; 29. a return spring; 30. a fixing mechanism; 31. a driven gear; 32. a glue spraying device; 33. mounting a boss; 34. and a bearing.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: an edge covering device convenient for production of automobile roof plastic accessories and capable of being accurately butted comprises an edge covering device main body 1, a fixed barrel 4, a servo motor 14 and a push block 25, wherein a first hydraulic rod 2 is installed at the top of the edge covering device main body 1, a roof main body 3 is arranged at the bottom of the first hydraulic rod 2, the fixed barrel 4 is arranged on the bottom surface of the roof main body 3, the inside of the fixed barrel 4 is connected with a support rod 6 through a telescopic spring 5, the bottom of the support rod 6 is connected with an ejector block 8 through a torsion spring 7, a fixed plate 9 is arranged inside the edge covering device main body 1, a cutting die 10 is installed at the bottom of the fixed plate 9, an edge covering material 11 is arranged right below the cutting die 10, the inside of the edge covering device main body 1 is connected with a workbench 13 through a second hydraulic rod 12, the top of the servo motor 14 is connected with a main shaft 15, and the surface of the main shaft 15 is connected, the surface of the reverse ratchet 16 is connected with a reciprocating screw 21 through a first pulley set 19, the outer surface of the reciprocating screw 21 is connected with a fixing mechanism 30 through a nut 20, a glue spraying device 32 is installed on the fixing mechanism 30, the servo motor 14 is connected with a forward ratchet 22 through a main shaft 15, the surface of the forward ratchet 22 is connected with a connecting rod 24 through a second pulley set 23, a push block 25 is arranged at the top of the connecting rod 24, the surface of the push block 25 is in contact with the inside of the power gear 26, the surface of the power gear 26 is connected with a fixing bolt 28 through a tooth angle 27, the bottom of the fixing bolt 28 is connected with the fixing mechanism 30 through a return spring 29, a hollow installation boss 33 is arranged at one end of the power gear 26 close to the inner wall of the fixing mechanism 30, the hollow installation boss 33 is arranged to facilitate the connecting rod 24 and the push block 25 to pass through, a bearing 34 is sleeved outside, the bearing 34 is installed in the installation groove of the inner side wall of the fixing mechanism 30, so that the installation boss 33 can be rotatably installed on the inner side wall of the fixing mechanism 30, and further the installation of the power gear 26 is realized, the surface of the power gear 26 is connected with the driven gear 31, and the middle part of the driven gear 31 is connected with the glue spraying device 32.

2 symmetric distribution of first hydraulic stem are at the top of the device main part 1 of borduring, and 2 bottoms of first hydraulic stem are fixed connection with roof main part 3, and the equidistant distribution in bottom of roof main part 3 has fixed bucket 4, and the distribution area of fixed bucket 4 is the same with the slotted hole area on the fixed plate 9 simultaneously, is favorable to roof main part 3 can drive fixed bucket 4 and pass from fixed plate 9 is inside.

Fixed bucket 4 is the sleeve structure with bracing piece 6, and bracing piece 6 constitutes extending structure through expanding spring 5 and fixed bucket 4 to bracing piece 6 passes through torsional spring 7 and kicking block 8 constitution revolution mechanic, and the top of kicking block 8 is glossy circular-arc simultaneously, is favorable to kicking block 8 to paste work to material 11 of borduring, and is firm inadequately when avoiding material 11 of borduring to paste.

The servo motor 14 is positioned inside the binding device main body 1, the servo motor 14 forms a rotating structure through the main shaft 15 and the supporting spring 18 and the ratchet teeth 17, the ratchet teeth 17 are distributed on the main shaft 15 at equal angles, and when the external friction force is larger than the elastic action of the supporting spring 18, the main shaft 15 can rotate in the forward direction in the reverse ratchet wheel 16.

The top of the ratchet 17 is mutually attached to the inner wall of the reverse ratchet 16, the inner wall of the reverse ratchet 16 is an inclined notch which is arranged at an equal angle, and the reverse ratchet 16 forms a linkage structure with the reciprocating screw rod 21 through the first pulley group 19, so that the ratchet 17 drives the reverse ratchet 16 to rotate when the ratchet 17 is conveniently clamped with the reverse ratchet 16.

The reciprocating screw 21 and the nut 20 form threaded connection, the nut 20 and the fixing mechanism 30 form an integrated structure through a connecting block, the fixing mechanism 30 and the glue spraying device 32 are in rotary connection, and the glue spraying device 32 is located right above the workbench 13, so that the reciprocating screw 21 is favorable for driving the glue spraying device 32 to perform reciprocating work through the nut 20.

The arrangement of the inside of the forward ratchet wheel 22 is opposite to the arrangement direction of the inside of the reverse ratchet wheel 16, the forward ratchet wheel 22 forms a rotating structure with the connecting rod 24 through the second pulley set 23, and the push blocks 25 are symmetrically distributed at the top of the connecting rod 24, so that the reverse ratchet wheel 16 cannot rotate when the forward ratchet wheel 22 rotates.

The ejector pad 25 is located the inside of power gear 26, and the inside symmetry of power gear 26 is provided with convex block to power gear 26 is connected for the meshing with driven gear 31, and driven gear 31 is welded fastening with spouting mucilage binding and put 32 simultaneously, is favorable to ejector pad 25 to drive and spouts mucilage binding and put 32 and carry out the regulation of angle.

The tooth angle 27 is arranged on the outer side of the power gear 26 at the same angle, the top of the tooth angle 27 is arranged obliquely, the tooth angle 27 is clamped with the fixing bolt 28, and the bottom of the fixing bolt 28 forms a telescopic structure with the fixing mechanism 30 through the return spring 29, so that the position of the glue spraying device 32 cannot be changed after the angle is adjusted.

The working principle of the embodiment is as follows: according to the figures 1-4, when the edge covering device for producing the automobile roof plastic accessories convenient for accurate butt joint is used, firstly, a worker needs to place the edge covering device main body 1 at a proper position, then an external power supply is connected, a roof is placed on the surface of a workbench 13 at the same time, a clamping plate arranged on the workbench 13 is used for centrally positioning the roof, so that the edge covering device main body 1 can be accurately butted during working, then the workbench 13 is pushed through a second hydraulic rod 12, the workbench 13 drives the roof to ascend, then a first hydraulic rod 2 drives a fixed barrel 4 through a roof main body 3 to descend, the fixed barrel 4 drives an ejector block 8 to descend, the ejector block 8 drives an edge covering material 11 to be in contact with the inside of the roof, and the ejector block 8 extrudes a telescopic spring 5 through a support rod 6 due to the fact that the inside of the roof is in an irregular shape, the length of the jacking block 8 can be conveniently adjusted, meanwhile, the jacking block 8 can rotate with the supporting rod 6 through the torsion spring 7, so that the jacking block 8 can adapt to ceilings with different specifications, the jacking block 8 is favorable for driving the edge covering material 11 to be more tightly attached to the inner part of the ceiling, the phenomenon that the edge covering material 11 is folded when being attached is avoided, and the product quality is improved;

according to fig. 5-7, when glue needs to be sprayed to the ceiling, a worker can turn on the servo motor 14, so that the servo motor 14 can drive the main shaft 15 to rotate in the reverse direction, so that the main shaft 15 drives the ratchet 17 to engage with the inside of the reverse ratchet 16, so that the ratchet 17 can drive the reverse ratchet 16 to rotate, meanwhile, the main shaft 15 idles in the forward ratchet 22, then the reverse ratchet 16 drives the reciprocating screw rod 21 to rotate through the first pulley group 19, so that the reciprocating screw rod 21 and the nut 20 perform a threaded motion, so that the nut 20 drives the glue spraying device 32 to perform a reciprocating motion work on the top of the workbench 13 through the fixing mechanism 30, so that the glue spraying device 32 can automatically spray glue to the ceiling, thereby avoiding the need of manual processing, and being beneficial to improving the working efficiency, when the fixing mechanism 30 moves to contact with the connecting rod 24, so that the top of the connecting rod 24 is engaged with the inside of the power gear 26, thereby enabling the servo motor 14 to rotate in the forward direction, when the external friction is greater than the elastic action of the supporting spring 18, the main shaft 15 drives the ratchet 17 to idle inside the reverse ratchet 16, so that the main shaft 15 drives the forward ratchet 22 to rotate, the forward ratchet 22 drives the connecting rod 24 to rotate through the second pulley group 23, so that the connecting rod 24 drives the power gear 26 to rotate through the push block 25 and the bump inside the power gear 26, so that the power gear 26 and the driven gear 31 do the meshing motion, so that the driven gear 31 drives the glue spraying device 32 to adjust the angle, thereby facilitating the glue spraying device 32 to spray the ceilings of different specifications, facilitating the subsequent edge covering work, when the power gear 26 rotates, the power gear 26 drives the inclined surface of the tooth angle 27 to extrude the fixing bolt 28, thereby make gim peg 28 compress reset spring 29 for gim peg 28 slides to fixed establishment 30's inside, when adjusting the angle of spouting mucilage binding and putting 32, make gim peg 28 carry out the block work to tooth angle 27 under reset spring 29's elastic action, thereby make power gear 26 can not remove easily, be favorable to can not taking place to rock at the during operation of spouting mucilage binding and putting 32, thereby accomplish a series of works.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.