CN215163592U - Numerical control type clothing sewing device - Google Patents

Numerical control type clothing sewing device Download PDF

Info

Publication number
CN215163592U
CN215163592U CN202120683157.4U CN202120683157U CN215163592U CN 215163592 U CN215163592 U CN 215163592U CN 202120683157 U CN202120683157 U CN 202120683157U CN 215163592 U CN215163592 U CN 215163592U
Authority
CN
China
Prior art keywords
sewing
sewing machine
base
numerical control
machine main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202120683157.4U
Other languages
Chinese (zh)
Inventor
吴心平
徐留辉
陈俐如
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiangcheng Shengshuyuan Clothing Co ltd
Original Assignee
Xiangcheng Shengshuyuan Clothing Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiangcheng Shengshuyuan Clothing Co ltd filed Critical Xiangcheng Shengshuyuan Clothing Co ltd
Priority to CN202120683157.4U priority Critical patent/CN215163592U/en
Application granted granted Critical
Publication of CN215163592U publication Critical patent/CN215163592U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Sewing Machines And Sewing (AREA)

Abstract

The utility model discloses a numerical control formula clothing sewing device relates to clothing production technical field. The utility model discloses a base, operation panel, step motor and sewing machine main part, the laminating of base upper end has the operation panel, and the base upper end is fixed with two step motor, and step motor one side has connect the sewing machine main part soon. The utility model discloses a base, operation panel, step motor and sewing machine main part, it is lower to have solved current numerical control formula clothing sewing device degree of automation, is difficult to carry out the sewing of large tracts of land cloth, and sewing device is mostly single sewing machine head, when needs carry out multiple colour sewing thread sewing, and efficiency is lower, and the cloth location is not accurate during the sewing, easily leads to the product quality index low, problem that production efficiency is low.

Description

Numerical control type clothing sewing device
Technical Field
The utility model belongs to the technical field of clothing production, especially, relate to a numerical control formula clothing sewing device.
Background
The sewing machine, it is a machine that forms one or more kinds of stitch seam on the sewing material with one or more sewing threads, make one or more layers of sewing material interweave or sew up, the sewing machine is generally made up of four parts of aircraft nose, frame, transmission and annex, the traditional sewing machine is by the manual work trample footboard sewing machine, the hand and foot are used and worked, the efficiency is lower, the worker's intensity of labour is greater, and the requirement for the technical level of the worker is higher, with the development of the era, the speed of the manual operation sewing machine has been more and more unable to meet the production demand of the modern clothing trade, in order to improve sewing technology and efficiency, the numerical control clothing sewing machine comes and comes into effect, it has the sewing speed to be fast, easy to operate, the stability is high, the function is various, the high advantage of production efficiency, but it still has the following drawbacks in the actual use:
1. the existing numerical control type clothing sewing device generally sews cloth by moving a sewing machine head, the cloth needs to be manually moved in the sewing process to assist the work of the numerical control type clothing sewing device, the automation degree is low, and the sewing of the cloth with large area is difficult to carry out;
2. the existing numerical control type garment sewing device generally adopts a single sewing machine head to sew, only one color of sewing thread can be sewn at one time, and when two-color or multi-color threads exist on a fabric and need to be sewn, the sewing speed is slow, so that the production efficiency is low;
3. the existing numerical control type clothing sewing device has the problems that in the sewing process, the positioning is not accurate due to the fact that the cloth is wrinkled and inclined, the cloth is damaged easily due to the fact that the large-area pressing plate is used for serging, the sewing position of a sewing machine is limited, and the production speed is reduced.
Therefore, the existing numerical control type clothing sewing device cannot meet the requirements in practical use, so that an improved technology is urgently needed in the market to solve the problems.
Disclosure of Invention
An object of the utility model is to provide a numerical control formula clothing sewing device, through base, operation panel, step motor and sewing machine main part, it is lower to have solved current numerical control formula clothing sewing device degree of automation, is difficult to carry out the sewing of large tracts of land cloth, and sewing device is mostly single sewing machine head, when needs carry out multiple colour sewing thread sewing, and efficiency is lower, and the cloth location is not accurate during the sewing, easily leads to the problem that the product quality is low in rate, and production efficiency is low.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model relates to a numerical control formula clothing sewing device, including base, operation panel, step motor and sewing machine main part, the laminating of base upper end has the operation panel, removes about the base upper end through the operation panel, can increase the utility model discloses the area of sewing improves sewing speed, improves degree of automation, the base upper end is fixed with two step motor, step motor one side has connect the sewing machine main part soon, can make sewing machine main part back-and-forth movement carry out the sewing through step motor to with the operation panel synergism, improve the utility model discloses an degree of automation, two sewing machine main parts can carry out the sewing of two kinds of colour sewing threads simultaneously, have improved sewing speed greatly.
Further, the welded fastening has a table foot around the base bottom surface, base top surface rear end is provided with the controller, the display has been seted up to controller one side, controller one side is located display lower extreme joint and has the button, controller one side is located button one side and has seted up the interface, can set up the form and the speed of sewing machine main part through the controller to can control the sewing pattern through control operation platform and step motor's removal speed, promote the utility model discloses the numerical control degree.
Further, the operation panel upper surface bonds and has the cotton board of bubble, operation panel one side switching has the rotor plate, the operation panel front end runs through and has seted up the shifting chute, the shifting chute inboard runs through the joint and has the dwang, the laminating of dwang periphery front end has drive belt, the dwang passes through drive belt and the servo motor transmission is connected, operation panel bottom side rear end is provided with first driver, can avoid the damage that sewing syringe needle direct contact operation platform caused, the extension through the cotton board of bubble the utility model discloses a life, through the synergism of first driver and servo motor, control operation platform that can be accurate removes, has increased sewing area, has increased the variety of sewing pattern, has improved sewing efficiency.
Further, servo motor connects soon and is fixed in the base bottom surface, first driver connects soon and is fixed in the base bottom side, the operation panel is located the cotton board upside of bubble and adsorbs there is magnet, and the operation panel can be fixed the cloth in the position that does not need the sewing through magnet for can be by the metal material of magnet adsorption, avoids the fold of cloth and crooked sewing position inaccuracy that leads to, improves the quality goods rate of production.
Further, step motor runs through and pegs graft in first locating plate front side, step motor connects soon and is fixed in first locating plate front side upper end, first locating plate has the second locating plate through limiting plate connection, first locating plate rear side is fixed with the rotation post through the step motor joint, the welding of rotation post both ends has the spacing ring, the rotation post is located the limiting plate upper end, it pegs graft in second locating plate front side to rotate the post rear end, second locating plate rear side connects soon and is fixed with the second driver, through the synergism of step motor and second driver, the back-and-forth movement of control sewing machine main part that can be accurate guarantees the accuracy of sewing position, increases the sewing area, improves the utility model discloses an degree of automation.
Further, first locating plate welded fastening is in the base front end, second locating plate welded fastening is in the base upside, two the second driver laminating in the base upside, two the laminating has the controller between the second driver, can operate two sewing machine main parts simultaneously through two step motor and sew, improves sewing speed greatly.
Further, the sewing machine body upside has changeed the top cap, sewing machine head has been connected to sewing machine body bottom joint, sewing machine head bottom welding has the clamp plate, the joint has the screwed pipe through to sewing machine body side, can overhaul the sewing machine main part through opening the top cap, prolongs the life of sewing machine main part, can compress tightly at the position edge that needs the sewing through the clamp plate, further guarantees the accuracy of sewing the position.
Further, the sewing machine main part runs through the screwed pipe and connects soon in the rotation post outer peripheral face, sewing machine main part bottom surface laminating in the limiting plate upside, sewing machine head and clamp plate suspension are in the cotton board upside of bubble, and the sewing machine main part can drive the rotation of screwed pipe through the rotation post, makes the sewing machine main part sew in the operation panel upper end back-and-forth movement, and it is efficient to sew, controls accurately.
The utility model discloses following beneficial effect has:
1. the utility model discloses a set up the operation panel, step motor and sewing machine main part, it generally moves through the sewing machine head and sews the cloth to have solved current numerical control formula clothing sewing device, need be in the work of the in-process manual movement cloth of sewing with supplementary numerical control formula clothing sewing device, degree of automation is lower, be difficult to carry out the problem of the sewing of large tracts of land cloth, through the synergism of servo motor and first driver, can drive moving about the operation panel, through the synergism of step motor and second driver, can the positive reverse rotation of accurate control column rotor, the back-and-forth movement of driving the sewing machine main part has increased the sewing area, the variety that can the sewing pattern has been increased, improve the utility model discloses an degree of automation.
2. The utility model discloses a set up two step motor and two sewing machine main parts, it generally adopts single sewing machine head to sew to have solved current numerical control formula clothing sewing device, the sewing thread of a colour can only be sewed once only, when having bicolor or polychrome line to need the sewing on the cloth, sewing speed is slower, lead to the lower problem of production efficiency, can two sewing machine main parts of concurrent operation sew through two step motor, can carry out the sewing of the sewing thread of two kinds of colours simultaneously, the sewing speed is accelerated, and the production efficiency is improved.
3. The utility model discloses a set up the operation panel, sewing machine main part and magnet, current numerical control formula clothing sewing device has been solved at the in-process of sewing, there is cloth fold and the crooked inaccurate condition that leads to fixing a position, and carry out the lockstitching through the large tracts of land clamp plate and lead to the cloth impaired easily again and sewing machine sewing position is limited, reduce production speed's problem, the operation panel is for can being fixed the metal material by magnet adsorption, can fix the cloth in the position that does not need the sewing through magnet, avoid the fold and the crooked sewing position that lead to of cloth inaccurate, the clamp plate can compress tightly at the position edge that needs the sewing, further guarantee the accuracy of sewing position, the quality goods rate of improvement production.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a structural effect diagram of the present invention;
FIG. 2 is a structural diagram of the base of the present invention;
FIG. 3 is a structural diagram of the operation table of the present invention;
FIG. 4 is a structural diagram of the stepping motor of the present invention;
fig. 5 is a structural view of the sewing machine main body of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a base; 101. a table leg; 102. a controller; 103. a display; 104. a button; 105. an interface; 2. an operation table; 201. soaking a cotton plate; 202. a rotating plate; 203. rotating the rod; 204. a drive belt; 205. a moving groove; 206. a first driver; 207. a servo motor; 3. a stepping motor; 301. a first positioning plate; 302. a second positioning plate; 303. a second driver; 304. a limiting plate; 305. rotating the column; 306. a limiting ring; 4. a sewing machine main body; 401. a top cover; 402. a sewing machine head; 403. pressing a plate; 404. a threaded pipe; 5. and a magnet.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Please refer to fig. 1-5, the utility model relates to a numerical control type clothing sewing device, including base 1, operation panel 2, step motor 3 and sewing machine main part 4, the laminating of base 1 upper end has operation panel 2, operation panel 2 can drive the cloth and control about base 1 upper end, make two sewing machine main parts 4 can be at x to sewing to operation panel 2 on the optional position, base 1 upper end is fixed with two step motor 3, step motor 3 one side has connect sewing machine main part 4 soon, can make sewing machine main part 4 back-and-forth movement sew through step motor 3, and with operation panel 2 synergism, carry out the sewing of each position, two sewing machine main parts 4 can carry out the sewing of two kinds of colour sewing threads simultaneously.
Wherein as shown in fig. 2, welded fastening has a table foot 101 around base 1 bottom surface, base 1 top surface rear end is provided with controller 102, display 103 has been seted up to controller 102 one side, controller 102 one side is located display 103 lower extreme joint and has button 104, and controller 102 one side is located button 104 one side and has been seted up interface 105, can open and close and operate through button 104 the utility model discloses, can peg graft in interface 105 through the data line and make controller 102 can be connected with first driver 206 and second driver 303 to can connect external device, can set up the form and the speed of sewing machine main part 4 through the synergism of button 104 and display 103, and can control the sewing pattern through control operation panel 2 and step motor 3's translation rate.
As shown in fig. 1 and 3, a foam board 201 is adhered to the upper surface of an operating table 2, a rotating board 202 is connected to one side of the operating table 2, a moving groove 205 is formed in the front end of the operating table 2 in a penetrating manner, a rotating rod 203 is connected to the inner side of the moving groove 205 in a penetrating manner in a clamping manner, a transmission belt 204 is attached to the front end of the outer peripheral surface of the rotating rod 203, the rotating rod 203 is in transmission connection with a servo motor 207 through the transmission belt 204, a first driver 206 is arranged at the rear end of the bottom side of the operating table 2, the servo motor 207 is fixed to the bottom surface of a base 1 in a rotating manner, the first driver 206 is fixed to the bottom side of the base 1 in a rotating manner, a magnet 5 is adsorbed on the upper side of the foam board 201 of the operating table 2, the damage caused by the sewing needle directly contacting the operating table 2 can be avoided through the foam board 201, the operating table 2 can be taken out from the upper side of the base 1 through the rotating board 202, cloth placing and positioning can be convenient, the rotation and the rotation speed of the servo motor 207 can be controlled through the first driver 206, make servo motor 207 drive dwang 203 through driving belt 204 and rotate, the removal of accurate control operation panel 2, operation panel 2 can be fixed the cloth in the position that does not need the sewing through magnet 5 for can being by the adsorbed metal material of magnet 5, avoids the fold of cloth and crooked sewing position that leads to inaccurate.
As shown in fig. 1 and 4, the stepping motor 3 is inserted into the front side of the first positioning plate 301, the stepping motor 3 is screwed and fixed to the upper end of the front side of the first positioning plate 301, the first positioning plate 301 is connected to the second positioning plate 302 through the limiting plate 304, the rear side of the first positioning plate 301 is fixed with the rotary column 305 through the stepping motor 3 in a clamping manner, two ends of the rotary column 305 are welded with the limiting rings 306, the rotary column 305 is located at the upper end of the limiting plate 304, the rear end of the rotary column 305 is inserted into the front side of the second positioning plate 302, the rear side of the second positioning plate 302 is fixed with the second driver 303 in a screwing manner, the first positioning plate 301 is welded and fixed to the front end of the base 1, the second positioning plate 302 is welded and fixed to the upper side of the base 1, the two second drivers 303 are attached to the upper side of the base 1, the controller 102 is attached between the two second drivers 303, the rotation direction and the rotation speed of the stepping motor 3 are controlled by the second driver 303, so that the stepping motor 3 drives the rotary column 305 to rotate, the back-and-forth movement of control sewing machine main part 4 that can be accurate, spacing ring 306 can limit the turned position of sewing machine main part 4, can sew simultaneously through two step motor 3 two sewing machine main parts 4 of simultaneous operation.
As shown in fig. 1 and 5, a top cover 401 is connected to the upper side of the sewing machine body 4, a sewing machine head 402 is connected to the bottom end of the sewing machine body 4 in a clamping manner, a pressing plate 403 is welded to the bottom end of the sewing machine head 402, a threaded pipe 404 is connected to the side surface of the sewing machine body 4 in a penetrating and clamping manner, the sewing machine body 4 is connected to the outer peripheral surface of the rotating column 305 in a penetrating and screwing manner through the threaded pipe 404, the bottom surface of the sewing machine body 4 is attached to the upper side of the limiting plate 304, the sewing machine head 402 and the pressing plate 403 are suspended on the upper side of the foam board 201, the sewing machine body 4 can be periodically overhauled by opening the top cover 401, the edge of the position needing sewing can be pressed by the pressing plate 403, the sewing machine body 4 can drive the rotation of the threaded pipe 404 by the rotating column 305, the sewing machine body 4 can move back and forth on the upper end of the operating platform 2 for sewing, the limit plate 304 can ensure that the sewing machine body 4 does not rotate while moving.
One specific application of this embodiment is: the rotating plate 202 can take out the operation table 2 from the upper side of the base 1, place the cloth on the upper side of the foam board 201, and adsorb and position the position of the cloth which does not need to be sewn through a plurality of magnets 5, thereby avoiding the inaccurate sewing position caused by the crease and the skew of the cloth, improving the quality product rate of production, inserting the operation table 2 with the cloth outside the rotating rod 203 through the moving groove 205, closing the moving groove 205 by rotating the rotating plate 202, opening and closing the controller 102 through the button 104, inserting the data line in the inserting port 105 to enable the controller 102 to be connected with the first driver 206 and the second driver 303 and to be connected with external equipment, setting the sewing form and the sewing speed of the sewing machine main body 4 through the cooperation of the button 104 and the display 103, improving the numerical control degree of the utility model, controlling the first driver 206 and the second driver 303 through the controller 102, enabling the first driver 206 to control the servo motor 207 to turn and rotate speed, the servo motor 207 drives the rotating rod 203 to rotate through the transmission belt 204, the accurate control operation platform 2 moves left and right, the second driver 303 controls the steering and rotating speed of the stepping motor 3, the stepping motor 3 drives the rotating column 305 to rotate, the sewing machine main body 4 can drive the rotating of the threaded pipe 404 through the rotating column 305, the accurate control of the back and forth movement of the sewing machine main body 4 can ensure that the sewing machine main body 4 can not rotate when moving through the limiting plate 304, the sewing area is increased, the diversity of sewing patterns is increased, the sewing efficiency is improved, the pressing plate 403 can press the edge of the position needing sewing, the accuracy of the sewing position is further ensured, the two stepping motors 3 can simultaneously operate the two sewing machine main bodies 4 to sew simultaneously, and the sewing of sewing threads with two colors can be simultaneously carried out, improve sewing speed, can carry out periodic maintenance to sewing machine main part 4 through opening top cap 401, can avoid the damage that sewing syringe needle direct contact operation panel 2 caused, extension through steeping cotton board 201 the utility model discloses a life.
The above is only the preferred embodiment of the present invention, and the present invention is not limited thereto, any technical solutions recorded in the foregoing embodiments are modified, and some technical features thereof are replaced with equivalent ones, and any modification, equivalent replacement, and improvement made thereby all belong to the protection scope of the present invention.

Claims (8)

1. The utility model provides a numerical control formula clothing sewing device, includes base (1), operation panel (2), step motor (3) and sewing machine main part (4), its characterized in that: the sewing machine is characterized in that an operating table (2) is attached to the upper end of the base (1), two stepping motors (3) are fixed to the upper end of the base (1), and a sewing machine main body (4) is connected to one side of each stepping motor (3) in a rotating mode.
2. The numerical control type clothing sewing device according to claim 1, characterized in that table legs (101) are welded and fixed around the bottom surface of the base (1), a controller (102) is arranged at the rear end of the top surface of the base (1), a display (103) is arranged on one side of the controller (102), a button (104) is clamped on one side of the controller (102) and located at the lower end of the display (103), and a socket (105) is arranged on one side of the controller (102) and located at one side of the button (104).
3. The numerical control type clothing sewing device of claim 1, characterized in that, the foam board (201) has been bonded to operation panel (2) upper surface, operation panel (2) one side switching has rotor plate (202), moving slot (205) have been seted up in the running through of operation panel (2) front end, the inboard running through joint of moving slot (205) has dwang (203), the laminating of dwang (203) periphery front end has drive belt (204), dwang (203) are connected through drive belt (204) and servo motor (207) transmission, operation panel (2) bottom side rear end is provided with first driver (206).
4. The numerical control type clothing sewing device according to claim 3, characterized in that the servo motor (207) is screwed and fixed on the bottom surface of the base (1), the first driver (206) is screwed and fixed on the bottom side of the base (1), and the operating platform (2) is positioned on the upper side of the foam board (201) and is adsorbed with the magnet (5).
5. The numerical control type clothing sewing device according to claim 1, characterized in that step motor (3) runs through and is pegged graft in first locating plate (301) front side, step motor (3) connect soon and is fixed in first locating plate (301) front side upper end, first locating plate (301) are connected with second locating plate (302) through limiting plate (304), first locating plate (301) rear side is fixed with rotation post (305) through step motor (3) joint, the welding of rotation post (305) both ends has spacing ring (306), rotation post (305) are located limiting plate (304) upper end, rotation post (305) rear end is pegged graft in second locating plate (302) front side, second locating plate (302) rear side connects soon and is fixed with second driver (303).
6. The numerical control type clothing sewing device according to claim 5, characterized in that the first positioning plate (301) is welded and fixed at the front end of the base (1), the second positioning plate (302) is welded and fixed at the upper side of the base (1), the two second drivers (303) are attached to the upper side of the base (1), and the controller (102) is attached between the two second drivers (303).
7. The numerical control type clothing sewing device according to claim 1, characterized in that a top cover (401) is connected to the upper side of the sewing machine main body (4) in a switching mode, a sewing machine head (402) is connected to the bottom end of the sewing machine main body (4) in a clamping mode, a pressing plate (403) is welded to the bottom end of the sewing machine head (402), and a threaded pipe (404) penetrates through and is connected to the side face of the sewing machine main body (4) in a clamping mode.
8. The numerical control type clothing sewing device according to claim 7, characterized in that the sewing machine main body (4) is screwed on the outer peripheral surface of the rotating column (305) through a threaded pipe (404), the bottom surface of the sewing machine main body (4) is attached to the upper side of the limiting plate (304), and the sewing machine head (402) and the pressing plate (403) are suspended on the upper side of the foam board (201).
CN202120683157.4U 2021-04-03 2021-04-03 Numerical control type clothing sewing device Active CN215163592U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120683157.4U CN215163592U (en) 2021-04-03 2021-04-03 Numerical control type clothing sewing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120683157.4U CN215163592U (en) 2021-04-03 2021-04-03 Numerical control type clothing sewing device

Publications (1)

Publication Number Publication Date
CN215163592U true CN215163592U (en) 2021-12-14

Family

ID=79358657

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202120683157.4U Active CN215163592U (en) 2021-04-03 2021-04-03 Numerical control type clothing sewing device

Country Status (1)

Country Link
CN (1) CN215163592U (en)

Similar Documents

Publication Publication Date Title
JPS58112287U (en) hole sewing machine
CN215163592U (en) Numerical control type clothing sewing device
CN108360156B (en) Sewing machine feeding mechanism for three-dimensional fabric sewing
CN108360153B (en) Arc-shaped barrel type sewing machine
CN210529222U (en) Novel thread trimming mechanism for sewing machine
CN203393414U (en) Numerical-control multifunctional automatic sewing machine
CN212451871U (en) Material taking device for serging machine
CN216193222U (en) Multifunctional overedger
CN210341282U (en) Welt covering equipment
CN113914023A (en) Sewing machine
CN211546866U (en) Automatic sewing device
CN207498609U (en) A kind of orientable computer sewing machine
CN203904631U (en) Intelligent control multifunctional sewing machine
CN219450106U (en) Double-needle color-changing embroidery machine head
CN220335436U (en) Intelligent high-speed cloth sewing machine
CN207313871U (en) Bird nest-preventing thread-off-preventing full-automatic template high-speed sewing equipment
EP0279154A3 (en) Embroidery machine
CN217973647U (en) Pattern cloth pattern sewing machine
CN213507475U (en) Sewing machine with synchronous multiple processes
CN104963119B (en) Full-automatic numerical control template sewing processing equipment
CN216237595U (en) Intelligent multi-needle quilting device for spinning
CN219824554U (en) Feeding device of precise quilter
CN208869789U (en) A kind of control device of double-colored template sewing machine
CN212103214U (en) Full-automatic bridge type double-color sewing machine
CN110735237A (en) control device of double-color stencil sewing machine

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant