DESC:FORM - 2

THE PATENTS ACT, 1970
(39 of 1970)

COMPLETE SPECIFICATION
(Section 10; Rule 13)

“AN INJECTION UNIT FOR A RUBBER INJECTION MOLDING MACHINE”

Kloeckner Desma Machinery Private Limited,
An Indian Company Having address at
Plot No. 10, Road No. 1,
GIDC, Kathwada,
B/h. Torrent Power Sub-station,
Ahmedabad, Gujarat, India – 382430

The following specification particularly describes the nature of this invention and the manner in which it is performed:
FIELD OF INVENTION:
The present invention relates to the field of rubber injection molding machine. The present invention provides an injection unit for the rubber injection molding machine. Moreover, the present invention provides an injection unit with the FIFO concept, used in the rubber injection molding machines having a vertical clamp unit.
BACKGROUND OF INVENTION:
The rubber injection molding machines are generally divided into four parts: Clamp unit, Injection unit, Hydraulic unit, and Electric unit.
The Injection unit is mainly classified into two types based on the type of way by which material is injected; which includes FIFO (First-In-First-Out) and FILO (First-In-Last-Out). In the FIFO, the injection unit is designed in such a way that the material filled in injection pot through plasticization unit is injected with First-In-First-Out basis. While in FILO type of injection unit, the material filled in injection pot through plasticization is injected in First-In-Last-Out basis. The injection unit performs tasks like feeding the rubber, plasticizing of rubber, filling the injection pot, and injecting the plasticized material in a mold. To perform these operations, mass of movable components of the injection unit moves horizontally; also, at the time of injecting the material, it induces tremendous amount of force, both of which needs to be balanced for stable operation.
Conventionally, there are three variants available for the FIFO type of injection unit which are FIFO A, FIFO B and FIFO C. However, FIFO A can only be used in the vertical clamp unit as it injects the material at 90° angle with respect to the injection pot. Said FIFO B and FIFO C have inline injection capabilities. FIFO B can only be used with horizontal clamp unit whereas, FIFO C can be used with both vertical and horizontal clamp units.
However, there are certain disadvantages to these conventionally used injection units. These injected units when used in a rubber molding machine lies overhead the operator’s side and creates a problem for the operator to comfortably use the machine. The overhead injection unit also makes the mold loading and unloading difficult. There are chances of oil leakage which makes the maintenance of the machine difficult. Moreover, it is also not possible to place an overhead automation in the machine due to the position of the injection unit.
PRIOR ARTS AND ITS DISADVANTAGES:
The prior art CN210590230U relates to an injection unit for the rubber injection molding machine which can lift the molten rubber into mold and make the raw material first-in-first-out. This invention provides an injection apparatus that includes the injection frame, feeding mechanism, rubber feed cylinder, discharging pipe, the injection hydro-cylinder, crane, and lift cylinder.
However, the above said prior art has the injection unit that resembles FIFO A and protrudes from the two sides of the clamp unit. The injection unit mentioned in this prior art has much complex structure. The arrangement for the injection of material in this system is highly vulnerable to initial leakage of material. In addition, the feed mechanism is more complex and requires routine tricky maintenance.
The prior art KR20140001220U describes a FIFO rubber injection unit of raw materials. The invention mentioned in the said prior art supplies the raw material to be molded to the rubber molding injection molding machine to the screw cylinder with a transfer screw, and the transferred raw material is supplied to the planar cylinder through a lower check valve by a screw. The rubber injection molding machine is a device that injects the rubber raw material of the dough into the upper and lower molds, undergoes a vulcanization process, separates the upper and lower molds, and obtains a molded product from the molding hole in the upper and lower molds.
However, in the above mentioned prior art, the injection of material is inline and not at 90° angle. It therefore resembles the FIFO C type of injection unit as mentioned in background. Moreover, the vertical injection unit mentioned in this prior art also causes capacity limitation i.e., the injection unit of capacity more than 500cc is not practical as structural instability will reach out of control of the operator.
DISADVANTAGES OF PRIOR ARTS:
Existing technologies used for an injection unit for a rubber injection molding machine suffers from all or at least any of the below mentioned disadvantages:
? Many of the prior arts fail to provide an injection unit for a rubber injection molding machine having a vertical clamp unit.
? Many of the prior arts fail to provide an injection unit that is based on First-In-First-Out concept.
? Most of the prior arts fail to provide an injection unit that accommodates the size in the range of 500cc - 4000cc.
? Many of the prior arts fail to provide an injection unit that withstands the horizontal movement of unbalanced masses.
? Many of the prior arts fail to provide an injection unit that is sturdy enough to balance the injection force.
? Most of the prior arts fail to provide an injection unit that when placed in a rubber injection molding machine, does not provide any overhead obstacles to the workers.
? Most of the prior arts fail to provide an injection unit that when placed in a rubber injection molding machine, allows easy loading and unloading of the mold from the front as well as from the overhead crane.
? Most of the prior arts fail to provide an injection unit that when placed in a rubber molding machine, allows a possibility of an add-on automation form the operator’s side.
? Many of the prior arts fail to provide an injection unit that allows for effortless and smooth movement to the injection force.
? Many of the prior arts fail to provide an injection unit that when placed in a rubber molding machine, improves the productivity of the machine.
? Most of the prior arts fail to provide an injection unit that prevents the leakage of oil droplets over the molded articles.
? Many of the prior arts fail to provide an injection unit that when placed in a rubber molding machine, makes the machine design sleek and compact so that it can acquires less footprint on the floor.
? Many of the prior arts fail to provide an injection unit that is user-friendly for the operator.
Thus, there is an unmet need to develop an invention that suffices the purpose of providing an injection unit with FIFO concept, used for a rubber injection molding machine having vertical clamp unit.
OBJECTS OF THE INVENTION:
Accordingly, the object of the present invention is to provide an injection unit for the rubber injection molding machine.
Another object of the present invention is to provide an injection unit that is based on First-In-First-Out concept.
Yet another object of the present invention is to provide an injection unit that is used by a rubber injection molding machine having vertical clamp unit.
Yet another object of the present invention is to provide an injection unit that accommodates the size in the range of 500cc - 4000cc.
Yet another object of the present invention is to provide an injection unit that withstands the horizontal movement of unbalanced masses.
Yet another object of the present invention is to provide an injection unit that is substantially sturdy to balance the injection force.
Yet another object of the present invention is to provide an injection unit that when placed in a rubber injection molding machine, does not provide any overhead obstacles to the workers.
Yet another object of the present invention is to provide an injection unit that when placed in a rubber injection molding machine, allows easy loading and unloading of the mold from the front as well as from the overhead crane.
Yet another object of the present invention is to provide an injection unit that when placed in a rubber molding machine, prevents leakage of oil droplets over the molded articles as well as over the operator or on the floor.
Yet another object of the present invention is to provide an injection unit that when placed in a rubber molding machine, allows a possibility of an add-on over-head automation form the operator’s side.
Yet another object of the present invention is to provide an effortless and smooth movement to the injection force.
Yet another object of the present invention is to provide an injection unit that when placed in a rubber molding machine, improves the productivity of the machine.
Yet another object of the present invention is to provide an injection unit that when placed in a rubber molding machine, makes the machine design sleek and compact so that it can acquires less footprint on the floor.
Yet another object of the present invention is to provide a user-friendly machine to the operator.

BRIEF DESCRIPTION OF DRAWINGS:
Fig 1 : Shows a 2-D diagram of the front view of the present invention.
Fig 2 : Shows the fragmented view of the present invention.
Fig 3 : Shows a fragmented view depicting the Flanges of the present invention.
Fig 4 : Shows a line diagram depicting step-wise working of the present invention.
Fig 5 : Shows a line diagram depicting step-wise working of the present invention.
Fig 6 : Shows a line diagram depicting step-wise working of the present invention.
Fig 7 : Shows a line diagram depicting step-wise working of the present invention.
Fig 8 : Shows a line diagram depicting step-wise working of the present invention.
Fig 9 : Shows a line diagram depicting step-wise working of the present invention.
Fig 10 : Shows a line diagram depicting step-wise working of the present invention.
Fig 11 : Shows the block diagram depicting the working of the present injection unit for a rubber injection molding machine.
Fig 12 : Shows the line diagram for the component parts of the present invention.

Reference numerals of said component parts of the present injection unit for the rubber injection molding machine:
100 : The present invention of an injection unit for the rubber injection molding machine
110 : Stationary unit
120 : Vertical sliding frame
130 : Moving unit
140 : Injection piston
150 : Injection cylinder
160 : Hydraulic cylinder
170 : Injection barrel
180 : Flange
180.1 : Flange 1
180.2 : Flange 2
180.3 : Flange 3
190 : Nozzle towers
200 : Linear Motion Guide
210 : Feeding zone
220 : Feed Barrel
230 : Screw Barrel
230.1 : Plasticizing screw
240 : Thrust Housing

SUMMARY OF THE INVENTION:
The present invention provides an injection unit (100) for the rubber injection molding machine. In particularly, the present invention provides an injection unit with the FIFO concept i.e. First In First Out used in the rubber injection molding machines having a vertical clamp unit. The present invention (100) comprises a Stationary unit (110), vertical sliding frame (120), Moving unit (130), Injection piston (140), Injection cylinder (150), Hydraulic cylinders (160), Injection barrel (170), Flange (180), Nozzle towers (190), Linear Motion guides (200), Feeding zone (210), Feed barrel (220), Screw barrel (230), Injection cylinder (240), and Thrust housing (250). The present invention of an injection unit (100) accommodates the size in the range of 500cc - 4000cc, and is substantially sturdy to balance the injection force. Further to this, the present invention allows the possibility of an add-on over-head automation thereby, substantially increasing the efficiency and overall production of the rubber injection molding machine.

DESCRIPTION OF THE INVENTION:
The present invention provides an injection unit for the rubber injection molding machine (100).
Said invention provides an injection unit (100) that is based on a First-In-First-Out (FIFO) concept i.e. the material filled in injection pot through plasticization is injected in First-In-First-Out basis.
Said invention provides an injection unit (100) for the rubber injection molding machine that has a vertical clamp unit.
Referring to Fig. 1-2 and Fig 12, said invention of an injection unit (100) for the rubber injection molding machine comprises:
• Stationary unit (110)
• vertical sliding frame (120)
• Moving unit (130)
• Injection piston (140)
• Injection cylinder (150)
• Hydraulic cylinders (160)
• Injection barrel (170)
• Flange (180)
• Nozzle towers (190)
• Linear Motion guides (200)
• Feeding zone (210)
• Feed barrel (220)
• Screw barrel (230)
• Injection cylinder (240)
• Thrust housing (250)

Said Stationary unit (110) provides a framework for the rubber injection molding machine on which other parts are mounted. Said stationary unit (110) is connected to vertical sliding frame (120) and plurality of hydraulic cylinder (160).
Said vertical sliding frame (120) is supported on the stationary unit (110). Said vertical sliding frame (120) holds the moving unit (130) and facilitates the sliding of said moving unit (130) vertically with help of hydraulic cylinder (160).
Said moving unit (130) is connected to vertical sliding frame (120) and further, slides horizontally on said vertical sliding frame (120) to perform injection activity.
Said injection piston (140) is connected to screw barrel (230). Said injection piston (140) injects the material in the mold through the nozzle tower (190).
Said Injection cylinder (150) is present in plurality in the present invention (100) and are connected to each other. Said plurality of injection cylinder (150) are further connected to Vertical sliding frame (120) and Thrust housing (240), and facilitates the force required to inject plasticizing material.
Said hydraulic cylinder (160) is present in plurality in the present invention (100). Said plurality of said Hydraulic cylinder (160) are connected to nozzle tower (190) to achieve a nozzle contact force. Said plurality of hydraulic cylinders (160) are further connected to vertical sliding frame (120) to perform the retraction action in the present injection unit (100).
Said injection barrel (170) connected to Flange 1 (180.1) and injection cylinder (150) holds the plasticized rubber at time of plasticizing. Said injection barrel (170) further acts as a cylinder while injecting the material through injection piston (140).
Said Flange (180) is present in plurality in the present invention and are connected to Nozzle tower (190). Said Flange (180) provides a buffer for the connection of two consecutive parts. Referring to Fig 3, Flange 1 (180.1) connects injection barrel (170) and nozzle tower (190) and provides gradual conversion in area through its internal geometry to the flow of injected material and concentrate the flow. Flange 2 (180.2) is connected to Flange 3 (180.3) through heavy bolted joint to create a firm sandwich structure that is substantially rigid to sustain injection forces. Said Flange (180) further provides sandwich structure to work rigidly against the injection force.
Said Nozzle tower (190) diverts the direction of injected material flow by 90° and injects the material in the mold. Said Nozzle towers (190) is connected to plurality of Flange (180) and Hydraulic cylinder (160) for the retraction action.
Said injection barrel (170), flange (180), and nozzle towers (190) are joined together in such a way that a gradual and smooth angle for shifting material at 90° angle concerning inlet and outlet is achieved.
Said Linear motion guides (200) provides sturdy, aligned, friction-less and smooth movement of Thrust housing (240) at the time of injection; and bears operational load. Said Linear motion guides (200) further facilitates the elimination of frictional loss.
The parts causing the injection process includes thrust housing (240), feed barrel (220), Linear motion guides (200), screw barrel (230), injection piston (140) and injection cylinder (150) in the present invention of an injection unit (100), has horizontal movements guided on Linear Motion guides to provide sturdy and friction-free movements.
Said invention of an injection unit has the material feeding at clamp unit height. Said feeding zone (210) is a portion of plasticizing screw and is covered by a feed barrel (220) which is directly connected with a leak-proof positively pressed joint. Said Feed barrel (220) connected to thrust housing (240) and screw barrel (230) feeds the rubber into the rubber injection molding machine through plasticizing screw (230.1). Said screw barrel (230) connected to Feed barrel (220) and injection piston (140) covers the plasticizing screw (230.1). The material is plasticized during rotation of screw due to friction between plasticizing screw (230.1) and screw barrel (230).
Said Thrust housing (240) is connected to the plurality of injection cylinder (150), feed barrel (220), and vertical sliding frame (120) through Linear motion guides (200). Said Thrust housing (240) provides torque required to plasticize the material through plasticizing screw.
Said invention of an injection unit (100) has one bolted flange type sandwich structure formed by the connection of flange 2 (180.2) and Flange 3 (180.3) through a heavy bolted joint that is substantially sturdy to balance the injection force.
Said invention of an injection unit (100) for the rubber injection molding machine balances the moving mass due to the synergistic working of frame structure, support structure, and the sandwich flange structure.
Said invention of an injection unit lack any structural support opposite to material flow channel where it bends by 90° angle, so nozzle tower (190) is connected to injection barrel (170) through flange type sandwiched bolted joint such that it can resist or balance the tremendous amount of injection force generated.
Said invention of an injection unit has the capacity to accommodate the size in the range of 500cc – 4000cc.
Said invention of an injection unit for the rubber injection molding machine when placed in a rubber molding machine, makes the machine design sleek and compact so that it can acquires less footprint on the floor.
Said invention can thus optimize the floor plan of the workshop by acquiring minimum space.
The present invention of an injection unit (100) for the rubber injection molding machine provides 10-15% reduction in tool changing time. The present invention further increases overall productivity of the rubber injection molding machine. The handling time of molded articles is reduced by 25-45% depending on type of article and number of cavities in mold.

WORKING OF THE INVENTION:
The detailed step-wise working of the present invention (100) is explicated herein. Referring to Fig. 4-10, the present invention (100) works simultaneously and parallelly, and thus, provides a substantially efficient injection unit (100) for a rubber injection molding machine.
1. Generating Nozzle contact force:
Hydraulic cylinder (160) generates nozzle contact force through nozzle tower (190) which facilitates the prevention of leakage of material from contact surfaces at the time of injection.

2. Refilling the Injection Barrel (170):
Injection cylinder (150) initially travels from retracted position to inside position to start refiling plasticized rubber in injection barrel (170).

3. Strip feeding the material:
Material feeding is done into the feed barrel (220), and screw (230.1) rotates to take rubber into its feed zone.

4. Plasticizing the rubber:
Rubber plasticizes due to rubbing between surfaces of a plasticizing screw (230.1) and screw barrel (230) after feed zone. Said plasticizing of rubber is a continuous process until the desired volume of plasticized rubber is filled in injection barrel (170).

5. Refiling the plasticized rubber:
Plasticized rubber continuously flows through hole in injection piston (140) and starts refilling the injection barrel (170). In said process, the refilled material creates back pressure due to which parallel to refilling the injection cylinder (150) move backwards in a synchronous manner.

6. Injecting the material:
Once the desired volume of plasticized rubber is filled in injection barrel (170), the injection cylinder (150) moves forwards generating injection force, and with this force the material is injected by injection piston (140) through nozzle tower (190). During this process, plurality of flanges (180) facilitates required structural reaction against said injection force.

7. Retracting the vertical sliding frame (120):
After injecting the material, vertical sliding frame (120) is retracted through hydraulic cylinder.
Once the molded article is removed, and clamp unit is closed again for subsequent molding, the process steps are repeated from 1 to 7.

ADVANTAGES OF THE INVENTION:
The present invention of a visual target associated workout device has multiple advantages over the prior art:
• The injection unit mentioned in the present invention can be used by a rubber injecting molding machine having vertical clamp unit.
• The injection unit mentioned in the present invention has the capacity to accommodate the size in the range of 500cc - 4000cc.
• The injection unit mentioned in the present invention is able to withstand the horizontal movement of unbalanced masses.
• The injection unit mentioned in the present invention is substantially sturdy enough to balance the injection force.
• The injection unit mentioned in the present invention when placed in a rubber injection molding machine, does not provide any overhead obstacles to the workers.
• The injection unit mentioned in the present invention when placed in a rubber injection molding machine, allows easy loading and unloading of the mold from the front as well as from the overhead crane.
• The injection unit mentioned in the present invention when placed in a rubber injection molding machine, prevents the leakage of oil droplets from falling either the over-molded component, over the operator or on the floor.
• The injection unit mentioned in the present invention when placed in a rubber injection molding machine, allows the possibility of an add-on over-head automation form the operator’s side.
• The injection unit mentioned in the present invention uses Linear Motion guides to reduce friction and thereby, provides an effortless and smooth movement to the injection force.
• The injection unit mentioned in the present invention when placed in a rubber injection molding machine, improves the overall productivity of the machine as the use of overhead crane reduces setup time while changing the mold, and the use of add-on automaton reduces setup and preparation time after each molding cycle.
• The injection unit mentioned in the present invention offers a user-friendly machine for the operators.
,CLAIMS:We claim,
1. An injection unit for a rubber injection molding machine, wherein said injection unit (100) comprises;
a stationary unit (110) connected to a vertical sliding frame (120) and a plurality of hydraulic cylinder (160), configured to provide a framework for the rubber injection molding machine; said vertical sliding frame (120) supported on said stationary unit (110), configured to facilitate the sliding of a moving unit (130) vertically with help of hydraulic cylinder (160); said moving unit (130) connected to said vertical sliding frame (120), configured to slide horizontally on said vertical sliding frame (120) and facilitate the injection activity; an injection piston (140) connected to a screw barrel (230) configured to inject the material in the mold through a nozzle tower (190); a plurality of injection cylinder (150) connected to said vertical sliding frame (120) and a thrust housing (240) configured to facilitate the force required to inject plasticizing material; said plurality of hydraulic cylinder (160) connected to said nozzle tower (190) and vertical sliding frame (120) configured to achieve a nozzle contact force, and to perform the retraction action; an injection barrel (170) connected to a Flange 1 (180.1) and injection cylinder (150) is configured to hold the plasticized rubber and act as a cylinder while injecting the material through said injection piston (140); a flange (180) connected to nozzle tower (190) provides a buffer for the connection of two consecutive parts; said nozzle tower (190) connected to plurality of said Flange (180) and Hydraulic cylinder (160) configured to divert the direction of injected material flow by 90° and to inject the material in the mold; a linear motion guides (200) connected to said thrust housing (240) and vertical sliding frame (120) configured to provide sturdy, aligned, friction-less and smooth movement of said thrust housing (240) at the time of injection and to bear operational load; a feeding zone (210) covered by a feed barrel (220), directly connected with a leak-proof positively pressed joint; a feed barrel (220) connected to said thrust housing (240) and screw barrel (230) configured to feed the rubber; a screw barrel (230) connected to said feed barrel (220) and injection piston (140) configured to cover the plasticizing screw (230.1); and said thrust housing (240) connected to the plurality of said injection cylinder (150), feed barrel (220), and vertical sliding frame (120) through Linear motion guides (200) configured to provide torque required to plasticize the material through plasticizing screw.

2. An injection unit for a rubber injection molding machine, as claimed in claim 1, wherein said flange (180) further comprises of;
a Flange 1 (180.1) connected to said injection barrel (170) and nozzle tower (190) configured to provide gradual conversion in area to the flow of injected material and concentrate the flow, and a flange 2 (180.2) connected to flange 3 (180.3) configured to sustain injection force.

Dated this 28th day of January, 2023.

Gopi J. Trivedi (Ms)
IN/PA/993
Authorized Agent of Applicant

To,
The Controller of Patents,
The Patent Office,
At Mumbai.