CN203409230U - Soup ladling machine with spring buffering mechanism - Google Patents
Soup ladling machine with spring buffering mechanism Download PDFInfo
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- CN203409230U CN203409230U CN201320351635.7U CN201320351635U CN203409230U CN 203409230 U CN203409230 U CN 203409230U CN 201320351635 U CN201320351635 U CN 201320351635U CN 203409230 U CN203409230 U CN 203409230U
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- connecting rod
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Abstract
The utility model relates to the technical field of casting machinery, in particular to a soup ladling machine with a spring buffering mechanism. The soup ladling machine comprises a stander, an armed lever drive mechanism and a spoon drive mechanism, wherein the armed lever drive mechanism comprises a first motor, a first worm-gear assembly, a first transmission shaft and a five-link transmission mechanism, and the first transmission shaft is connected with an output shaft of the first motor; the spoon drive mechanism comprises a second motor, a second worm-gear assembly, a second transmission shaft, a chain group and a spoon, the second transmission shaft is connected with an output shaft of the second motor, the spoon is installed on the five-link transmission mechanism, and the spoon is connected with the second transmission shaft through the chain group; the five-link transmission mechanism is respectively connected with the first transmission shaft and the second transmission shaft; and the spring buffering mechanism is installed on the rear end of the stander, and the spring buffering mechanism is connected with the first worm-gear assembly. The soup ladling machine is stable to run, precise, precise, convenient to operate, high in working reliability and high in production safety performance, and the metal molten liquid is uneasy to overflow.
Description
Technical field
The utility model relates to foundry machinery technical field, relates in particular to a kind of soup feeding machine that is provided with spring buffer mechanism.
Background technology
Metal current die-casting and molding technology has been widely used in the industries such as automobile making, motorcycle production, household electrical appliance, communication electronics, Aero-Space manufacture, war production; Tradition is manufactured the general mode that adopts artificial cast feeding to die cast metal moulding, artificial cast feeding style cast feeding speed is slow, castable amount is unstable, the unstable product quality that production process can cause die casting to go out, be difficult to meet the required precision of modernization high-precision product, and execute-in-place direct labor's work is powerful, workpiece inclement condition, easily production development security incident.
Lag for traditional artificial pouring type, manufacturer develops link-type automatic casting feeding device, this automatic casting feeding device can be alleviated execute-in-place workman's labour intensity, but the transmission mechanism of this equipment toward renaturation swing work, during work, will inevitably make drive disk assembly because the inertia swinging causes equipment job insecurity, thereby can have influence on to soup effect.
Utility model content
The purpose of this utility model is that for the deficiencies in the prior art, providing a kind of can guarantee transmission mechanism smooth running, gives the effective soup feeding machine of soup.
For achieving the above object, a kind of soup feeding machine that is provided with spring buffer mechanism of the present utility model, comprise frame, armed lever driving mechanism and soup ladle driving mechanism, described armed lever driving mechanism comprises the first motor, the first worm and gear assembly, the first power transmission shaft and five jointed gear units, described the first motor is installed on described frame, and described the first power transmission shaft is connected with the output shaft of the first motor by described the first worm and gear assembly;
Described soup ladle driving mechanism comprises the second motor, the second worm and gear assembly, second driving shaft, chain group and soup ladle, described the second motor is installed on described frame, described second driving shaft is connected with the output shaft of the second motor by described the second worm and gear assembly, described soup ladle is installed on described five jointed gear units, and described soup ladle is connected with described second driving shaft by described chain group;
Described five jointed gear units are connected with the first power transmission shaft and second driving shaft respectively;
The rear end of described frame is equiped with spring buffer mechanism, and described spring buffer mechanism is connected with described the first worm and gear assembly.
Wherein, described the first worm and gear assembly comprises the first worm gear and first worm screw of intermeshing connection, and described the first worm screw is connected with the output shaft of the first motor, described the first worm gear and the socket of the first power transmission shaft; Described the second worm and gear assembly comprises the second worm gear and second worm screw of intermeshing connection, and described the second worm screw is connected with the output shaft of the second motor, described the second worm gear and second driving shaft socket.
Wherein, described spring buffer mechanism comprises ring flange and torsion spring, described ring flange be arranged at the first worm gear a side and with the first power transmission shaft socket, described torsion spring set is located at the first power transmission shaft, one end of torsion spring is fixedly connected with described frame, and the other end of torsion spring is fixedly connected with described ring flange.
Wherein, described five jointed gear units comprise first connecting rod, second connecting rod, third connecting rod, the 4th connecting rod and the 5th connecting rod, described first connecting rod is flexibly connected with second connecting rod, one end of described second connecting rod is flexibly connected with one end of third connecting rod, the other end of second connecting rod is flexibly connected with the 5th connecting rod, the other end of described third connecting rod is flexibly connected with one end of the 4th connecting rod, and the other end of described the 4th connecting rod is flexibly connected with the other end of the 5th connecting rod.
Wherein, described soup ladle driving mechanism also comprises sprocket shaft and soup ladle axle, and described chain group comprises the first chain and the second chain; Described sprocket shaft is arranged at the active connection place of the 5th connecting rod and the 4th connecting rod, described soup ladle axle is arranged at one end that the 5th connecting rod is provided with soup ladle, the output of described second driving shaft is provided with the first sprocket wheel, the two ends of described sprocket shaft are separately installed with the second sprocket wheel and the 3rd sprocket wheel, one end of described soup ladle axle and soup ladle socket, the other end of soup ladle axle is provided with the 4th sprocket wheel; Described the first sprocket wheel is connected with the second sprocket wheel by described the first chain, and described the 3rd sprocket wheel is connected with the 4th sprocket wheel by the second chain.
Wherein, described the second chain is arranged in the 5th connecting rod.
Wherein, described the second motor is reducing motor.
Wherein, described soup feeding machine also comprises electrical control mechanism, and described electrical control mechanism is installed on described frame and is electrically connected to the first motor and the second motor.
The beneficial effects of the utility model: a kind of soup feeding machine that is provided with spring buffer mechanism of the present utility model, during work, the output shaft reciprocating rotation of the first motor, and drive the first worm and gear assembly reciprocating rotation, the first worm and gear assembly drives connected the first power transmission shaft reciprocating rotation, the first power transmission shaft drives five jointed gear unit periodic wobble and works, thereby makes the soup ladle that is arranged at five jointed gear units realize left and right swing up and down, thereby realizes the transfer of soup ladle position, simultaneously, the output shaft rotation of the second motor, and drive the second worm and gear assembly to rotate, the second worm and gear assembly drives connected second driving shaft to rotate, second driving shaft drives soup ladle to rotate by chain group, thereby realize the rotation of soup ladle position, the whole course of work has realized dipping molten metal soup stock, send soup, give soup, return to the automatic control of four actions, cushioning effect can play to five jointed gear units in spring buffer mechanism, when the first power transmission shaft drives five-bar mechanism reciprocating rotation to endpoint location, spring buffer mechanism can reduce the inertia motion of the first worm and gear assembly of being connected with spring buffer mechanism, thereby the motion of guaranteeing five-bar mechanism is more steady, the utility model adopts independently the first motor to drive five jointed gear unit work, guarantees that the operation of five jointed gear units is precisely efficient, adopt independently the second motor to drive soup ladle to rotate, can be according to the demand of the required molten metal soup stock of die casting to soup, easy to operate, functional reliability is high, spring buffer mechanism can limit the inertia motion of five jointed gear units, guarantees that the motion of five-bar mechanism is more steady, produces safer.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is front view of the present utility model.
Fig. 3 is the structural representation after the utility model hidden parts parts.
Fig. 4 is the utility model partial structurtes schematic diagrames.
Fig. 5 is another structural representation after the utility model hidden parts parts.
Reference numeral comprises:
10-frame, 20-the first motor the 21-the first worm and gear assembly
22-the first power transmission shaft 23-first connecting rod 24-second connecting rod
25-third connecting rod, 26-the four connecting rod the 27-the five connecting rod
30-the second motor 31-the second worm and gear assembly 32-second driving shaft
33-soup ladle, 34-sprocket shaft, 35-soup ladle axle
36-the first sprocket wheel the 37-the second sprocket wheel 40— electrical control mechanism
51-ring flange, 52-torsion spring the 211-the first worm gear
212-the first worm screw 311-the second worm gear the 312-the second worm screw.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
As shown in Figures 1 to 5, a kind of soup feeding machine that is provided with spring buffer mechanism of the present utility model, comprise frame 10, armed lever driving mechanism and soup ladle driving mechanism, described armed lever driving mechanism comprises the first motor 20, the first worm and gear assembly 21, the first power transmission shaft 22 and five jointed gear units, described the first motor 20 is installed on described frame 10, and described the first power transmission shaft 22 is connected with the output shaft of the first motor 20 by described the first worm and gear assembly 21;
Described soup ladle driving mechanism comprises the second motor 30, the second worm and gear assembly 31, second driving shaft 32, chain group and soup ladle 33, described the second motor 30 is installed on described frame 10, described second driving shaft 32 is connected with the output shaft of the second motor 30 by described the second worm and gear assembly 31, described soup ladle 33 is installed on described five jointed gear units, and described soup ladle 33 is connected with described second driving shaft 32 by described chain group;
Described five jointed gear units are connected with the first power transmission shaft 22 and second driving shaft 32 respectively;
The rear end of described frame 10 is equiped with spring buffer mechanism, and described spring buffer mechanism is connected with described the first worm and gear assembly 21.
A kind of soup feeding machine that is provided with spring buffer mechanism of the present utility model, during work, the output shaft reciprocating rotation of the first motor 20, and drive the first worm and gear assembly 21 reciprocating rotations, the first worm and gear assembly 21 drives connected the first power transmission shaft 22 reciprocating rotations, the first power transmission shaft 22 drives five jointed gear unit periodic wobble ground work, thereby the soup ladle 33 realization left and right that are arranged at five jointed gear units are swung up and down, thereby realizes the transfer of soup ladle 33 positions, simultaneously, the output shaft rotation of the second motor 30, and drive the second worm and gear assembly 31 to rotate, the second worm and gear assembly 31 drives connected second driving shaft 32 to rotate, second driving shaft 32 drives soup ladle 33 to rotate by chain group, thereby realize the rotation of soup ladle 33 positions, the whole course of work has realized dipping molten metal soup stock, send soup, give soup, return to the automatic control of four actions, cushioning effect can play to five jointed gear units in spring buffer mechanism, when the first power transmission shaft 22 drives five-bar mechanism reciprocating rotation to endpoint location, spring buffer mechanism reduces the inertia motion of the first worm and gear assembly 21 of being connected with spring buffer mechanism, thereby the motion of guaranteeing five-bar mechanism is more steady, the utility model adopts independently the first motor 20 to drive five jointed gear unit work, guarantees that the operation of five jointed gear units is precisely efficient, adopt independently the second motor 30 to drive soup ladle 33 to rotate, can be according to the demand of the required molten metal soup stock of die casting to soup, easy to operate, functional reliability is high, spring buffer mechanism can limit the inertia motion of five jointed gear units, guarantees that the motion of five-bar mechanism is more steady, produces safer.
In the present embodiment, described the first worm and gear assembly 21 comprises the first worm gear 211 and first worm screw 212 of intermeshing connection, and described the first worm screw 212 is connected with the output shaft of the first motor 20, described the first worm gear 211 and the first power transmission shaft 22 sockets; Described the second worm and gear assembly 31 comprises the second worm gear 311 and second worm screw 312 of intermeshing connection, and described the second worm screw 312 is connected with the output shaft of the second motor 30, described the second worm gear 311 and second driving shaft 32 sockets.The transmission of the utility model worm and gear assembly, its major advantage be can obtain very large gearratio, compact conformation, transmission is steady and noise is little.
In the present embodiment, described spring buffer mechanism comprises ring flange 51 and torsion spring 52, described ring flange 51 is arranged at a side of the first worm gear 211 and is socketed with the first power transmission shaft 22, described torsion spring 52 is sheathed on the first power transmission shaft 22, one end of torsion spring 52 is fixedly connected with described frame 10, and the other end of torsion spring 52 is fixedly connected with described ring flange 51.Electric Machine Control the first worm screw 212 work, the first worm screw 212 drives the first worm gear 211 rotation works, the first worm gear 211 drives the first power transmission shaft 22 rotation works, the first power transmission shaft 22 drives five-bar mechanism to move back and forth, when moving back and forth, five jointed gear units can produce larger inertia, be five-bar mechanism while being rocked to end points the effect due to inertia can continue toward peak motion, when inertia is excessive, will inevitably cause the motion of five-bar mechanism to occur vibrations or shake, thereby impact is to soup effect, and ring flange 51 is set in the first worm gear 211 sides, be connected with the first worm gear 211, and be arranged with torsion spring 52 at the first power transmission shaft 22, the two ends of torsion spring 52 are fixedly connected with boxboard and ring flange 51 respectively, when five-bar mechanism moves to peak, torsion spring 52 meeting automatic tensions, thereby stoped ring flange 51 to be rotated further, stoped the first worm gear 211 to be rotated further, thereby the first power transmission shaft 22 stops continuing motion, make the inertia of five jointed gear units when operation reduce, the operation of guaranteeing five jointed gear units is more steady, precisely.
In the present embodiment, described five jointed gear units comprise first connecting rod 23, second connecting rod 24, third connecting rod 25, the 4th connecting rod 26 and the 5th connecting rod 27, described first connecting rod 23 is flexibly connected with second connecting rod 24, one end of described second connecting rod 24 is flexibly connected with one end of third connecting rod 25, the other end of second connecting rod 24 is flexibly connected with the 5th connecting rod 27, the other end of described third connecting rod 25 is flexibly connected with one end of the 4th connecting rod 26, and the other end of described the 4th connecting rod 26 is flexibly connected with the other end of the 5th connecting rod 27.The first power transmission shaft 22 rotates, drive first connecting rod 23 to swing, concrete, during soup feeding machine work of the present utility model, drive first connecting rod 23 to realize the swing of 130 ° of left and right, first connecting rod 23 drives second connecting rod 24 to swing, because the two ends of second connecting rod 24 are flexibly connected with third connecting rod 25 and the 5th connecting rod 27 respectively, second connecting rod 24 drives third connecting rod 25 and the 5th connecting rod 27 to swing simultaneously, third connecting rod 25 drives the 4th connecting rod 26 to swing again, the 4th connecting rod 26 drives the 5th connecting rod 27 to swing simultaneously, thereby realize first connecting rod 23, second connecting rod 24, third connecting rod 25, the synchronous swing of the 4th connecting rod 26 and the 5th connecting rod 27, and then realize steady to the 5th connecting rod 27, precisely, movement up and down efficiently, during production, can control as required the movement of the 5th connecting rod 27, realized the process that send soup and return, overall construction design is reasonable, good practical effect.
In the present embodiment, described soup ladle driving mechanism also comprises sprocket shaft 34 and soup ladle axle 35, and described chain group comprises the first chain and the second chain; Described sprocket shaft 34 is arranged at the active connection place of the 5th connecting rod 27 and the 4th connecting rod 26, described soup ladle axle 35 is arranged at one end that the 5th connecting rod 27 is provided with soup ladle 33, the output of described second driving shaft 32 is provided with the first sprocket wheel 36, the two ends of described sprocket shaft 34 are separately installed with the second sprocket wheel 37 and the 3rd sprocket wheel, one end of described soup ladle axle 35 and soup ladle 33 sockets, the other end of soup ladle axle 35 is provided with the 4th sprocket wheel; Described the first sprocket wheel 36 is connected with the second sprocket wheel 37 by described the first chain, and described the 3rd sprocket wheel is connected with the 4th sprocket wheel by the second chain.The second turning cylinder rotates, the first sprocket wheel 36 that drive is installed on power transmission shaft output rotates, the first sprocket wheel 36 rotates by first chain-driving the second sprocket wheel 37, the second sprocket wheel 37 drives sprocket shaft 34 to rotate, simultaneously, the 3rd sprocket rotation that install sprocket shaft 34 ends, the 3rd sprocket wheel is by the second chain-driving the 4th sprocket rotation, the 4th sprocket wheel drives soup ladle axle 35 to rotate, finally, the soup ladle 33 of soup ladle axle 35 one end sockets is realized and being rotated, during work, control the rotation direction of the output shaft of the second motor 30, can control the rotation direction of soup ladle axle 35, and then the rotation direction of control soup ladle 33, realized the process that dips and give soup, overall construction design is reasonable, adopt the connected mode of chain group to compare belt connection, move more steady, precisely, efficiently, good practical effect.
Concrete; described the second chain is arranged in the 5th connecting rod 27; wherein one end of sprocket shaft 34 and soup ladle axle 35 is all arranged in the 5th connecting rod 27; the 3rd sprocket wheel and the 4th sprocket wheel are all arranged in the 5th connecting rod 27; the second chain is positioned at the 5th connecting rod 27; can protect the second chain along with the swing of the 5th connecting rod 27, can not touch molten metal soup stock when work; prevent that the second chain is subject to the damage of high-temperature metal liquation soup stock; guarantee the integrality of equipment, thereby guarantee the normal operation of work.
Concrete, described the second motor 30 is reducing motor, the second motor 30 of the present utility model is controlled separately the rotation of soup ladle 33, soup ladle 33 is for dipping soup stock and pouring out soup stock, and when proceeding to this two procedures, the speed of required rotation does not all need too fast, therefore adopt reducing motor, both can export larger moment of torsion, and can make again the rotating speed of the second motor 30 lower to meet the speed that dips soup stock and pour out soup stock, meet operation principle of the present utility model.
In the present embodiment, described soup feeding machine also comprises electrical control mechanism 40, described electrical control mechanism 40 is installed on described frame 10 and is electrically connected to the first motor 20 and the second motor 30, electrical control mechanism 40 passes through to control the work of the first motor 20 and the second motor 30, thereby controls the running of whole soup feeding machine.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (8)
1. a soup feeding machine that is provided with spring buffer mechanism, comprise frame (10), armed lever driving mechanism and soup ladle driving mechanism, it is characterized in that: described armed lever driving mechanism comprises the first motor (20), the first worm and gear assembly (21), the first power transmission shaft (22) and five jointed gear units, described the first motor (20) is installed on described frame (10), and described the first power transmission shaft (22) is connected with the output shaft of the first motor (20) by described the first worm and gear assembly (21);
Described soup ladle driving mechanism comprises the second motor (30), the second worm and gear assembly (31), second driving shaft (32), chain group and soup ladle (33), described the second motor (30) is installed on described frame (10), described second driving shaft (32) is connected with the output shaft of the second motor (30) by described the second worm and gear assembly (31), described soup ladle (33) is installed on described five jointed gear units, and described soup ladle (33) is connected with described second driving shaft (32) by described chain group;
Described five jointed gear units are connected with the first power transmission shaft (22) and second driving shaft (32) respectively;
The rear end of described frame (10) is equiped with spring buffer mechanism, and described spring buffer mechanism is connected with described the first worm and gear assembly (21).
2. a kind of soup feeding machine that is provided with spring buffer mechanism according to claim 1, it is characterized in that: described the first worm and gear assembly (21) comprises the first worm gear (211) and first worm screw (212) of intermeshing connection, described the first worm screw (212) is connected with the output shaft of the first motor (20), described the first worm gear (211) and the first power transmission shaft (22) socket; Described the second worm and gear assembly (31) comprises the second worm gear (311) and second worm screw (312) of intermeshing connection, described the second worm screw (312) is connected with the output shaft of the second motor (30), described the second worm gear (311) and second driving shaft (32) socket.
3. a kind of soup feeding machine that is provided with spring buffer mechanism according to claim 2, it is characterized in that: described spring buffer mechanism comprises ring flange (51) and torsion spring (52), described ring flange (51) is arranged at a side of the first worm gear (211) and is socketed with the first power transmission shaft (22), described torsion spring (52) is sheathed on the first power transmission shaft (22), one end of torsion spring (52) is fixedly connected with described frame (10), and the other end of torsion spring (52) is fixedly connected with described ring flange (51).
4. a kind of soup feeding machine that is provided with spring buffer mechanism according to claim 1, it is characterized in that: described five jointed gear units comprise first connecting rod (23), second connecting rod (24), third connecting rod (25), the 4th connecting rod (26) and the 5th connecting rod (27), described first connecting rod (23) is flexibly connected with second connecting rod (24), one end of described second connecting rod (24) is flexibly connected with one end of third connecting rod (25), the other end of second connecting rod (24) is flexibly connected with the 5th connecting rod (27), the other end of described third connecting rod (25) is flexibly connected with one end of the 4th connecting rod (26), the other end of described the 4th connecting rod (26) is flexibly connected with the other end of the 5th connecting rod (27).
5. a kind of soup feeding machine that is provided with spring buffer mechanism according to claim 4, is characterized in that: described soup ladle driving mechanism also comprises sprocket shaft (34) and soup ladle axle (35), and described chain group comprises the first chain and the second chain; Described sprocket shaft (34) is arranged at the active connection place of the 5th connecting rod (27) and the 4th connecting rod (26), described soup ladle axle (35) is arranged at one end that the 5th connecting rod (27) is provided with soup ladle (33), the output of described second driving shaft (32) is provided with the first sprocket wheel (36), the two ends of described sprocket shaft (34) are separately installed with the second sprocket wheel (37) and the 3rd sprocket wheel, one end of described soup ladle axle (35) and soup ladle (33) socket, the other end of soup ladle axle (35) is provided with the 4th sprocket wheel; Described the first sprocket wheel (36) is connected with the second sprocket wheel (37) by described the first chain, and described the 3rd sprocket wheel is connected with the 4th sprocket wheel by the second chain.
6. a kind of soup feeding machine that is provided with spring buffer mechanism according to claim 5, is characterized in that: described the second chain is arranged in the 5th connecting rod (27).
7. a kind of soup feeding machine that is provided with spring buffer mechanism according to claim 1, is characterized in that: described the second motor (30) is reducing motor.
8. a kind of soup feeding machine that is provided with spring buffer mechanism according to claim 1, it is characterized in that: described soup feeding machine also comprises electrical control mechanism (40), described electrical control mechanism (40) is installed on described frame (10) and is electrically connected to the first motor (20) and the second motor (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320351635.7U CN203409230U (en) | 2013-06-19 | 2013-06-19 | Soup ladling machine with spring buffering mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320351635.7U CN203409230U (en) | 2013-06-19 | 2013-06-19 | Soup ladling machine with spring buffering mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203409230U true CN203409230U (en) | 2014-01-29 |
Family
ID=49972158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320351635.7U Expired - Fee Related CN203409230U (en) | 2013-06-19 | 2013-06-19 | Soup ladling machine with spring buffering mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203409230U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111097891A (en) * | 2020-02-17 | 2020-05-05 | 惠亚科技（东台）有限公司 | Casting system gives hot water mechanism |
| CN111846023A (en) * | 2020-08-17 | 2020-10-30 | 国网河南省电力公司新安县供电公司 | Buffer device of clamping mechanism for transformer substation inspection |
-
2013
- 2013-06-19 CN CN201320351635.7U patent/CN203409230U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111097891A (en) * | 2020-02-17 | 2020-05-05 | 惠亚科技（东台）有限公司 | Casting system gives hot water mechanism |
| CN111846023A (en) * | 2020-08-17 | 2020-10-30 | 国网河南省电力公司新安县供电公司 | Buffer device of clamping mechanism for transformer substation inspection |
| CN111846023B (en) * | 2020-08-17 | 2023-12-22 | 国网河南省电力公司新安县供电公司 | Buffer device of clamping mechanism for substation inspection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140129 Termination date: 20210619 |
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| CF01 | Termination of patent right due to non-payment of annual fee |