-2-FIELD OF THE INVENTION
The invention relates to an improved fixture device to hold pinion job to be cut with gear teeth and a process of preparing the same.
More particularly, the present invention is related to reduce production time drastically in fixing the job to be turned to pinion with an improved fixture for enhanced production of pinions.
BACKGROUND OF THE INVENTION
Pinion production is an essential and important implements in all engineering driving system, traction in locomotive and road vehicles and transmission of power to another system.
For heavy traction load size of pinion job is quite heavy and for which heavy support fixture is essential to keep the job in perfectly aligned and untiltable position during cutting operation of heavy gear teeth.

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The heavy pinion job is to be arranged and removed by crane. In the existing art the job is fixed on a fixture supported on a round machine table, arranged with several lower and upper packing block for gripping the job and the whole fixture is tightened by a nut at the top of the fixture device. All the packing blocks, a support base and the pinion job have a central hole to be fitted in register with a mandrel fixed at the centre of the round base support through slotted keys and bolts at a central vertical slot of the base. The support base, lower packing blocks, pinion job, upper packing blocks are sleeved sequentially through their central holes surrounding the vertical mandrel fixed on the table.
In the existing fixture device for the pinion job, during cutting of teeth around the circumference of the job heavy cutting load exerted on the job frequently disturb the central vertical axial position of the mandrel thus requiring frequent removal of all the parts of the fixture device from the mandrel for refixing the mandrel at the base for proper alignment of the job and the parts of the fixture device. For removal of those parts and the job and fixing the job support repeatedly go through unnecessary wastage of time and-disturbing production line. This situation is further aggravated by adding a heavy amount of wastage time due to removal and resetting of the fixture parts by cranes.

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To keep on line with the unhampered production of pinions, a thorough study of the existing prior arts and practice were made to device a new fixture for the pinion job to remove the above stated disadvantages of the job fixing with main aim to develop an improved fixture to save time during pinion job cutting operation.
DESCRIPTION OF THE INVENTION
According to one objective of the invention the support base of the prior fixture device is replaced by a single piece centrally holed heavy support mandrel fixture with a radially extending circular projection at a central portion of the support base for resting the pinion job and a vertically upper portion contiguous with the projected portion after the mandrel is fixed to the base (machine table) through locking keys provided on the base and fixed tightly on the base by nut and bolts circumferentially on another projected circular portion at the bottom of the support base, thus preventing any loosening or tilted off position of the mandrel axis once the mandrel is fixed on the machine table and the mandrel fixture is sleeved through the mandrel.

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According to another objective of the invention instead of several packing blocks as in the prior art there is provided a centrally holed single piece upper packing block with a higher diameter bottom part and a contiguous upper part of lower diameter and the said packing block being sleeved through the mandrel after the pinion job is sleeved through the mandrel and rested on the mandrel fixture.
A still another objective of the invention is to provide a ring resting at the bottom on the projected surface of the mandrel fixture and its height is maintained upto the height of the upper portion of the mandrel fixture and is placed between a small gap maintained between the inner circular surface of the job and the external circular surface of the top portion of the mandrel fixture, to enhance a firm grip of the job at its lower portion with the firmly fixed mandrel fixture.
A still further objective of the invention is to provide a circular centrally holed packing resting on the upper surface of the projected portion of the mandrel fixture and in tightly fitting relation with the ring at its bottom thus ensuring firm grip of the job with the mandrel fixture and preventing any radial tilting of the job.

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A yet another objective of the invention is to provide a thicker centrally holed packing ring having height of the gap between the top surface of the upper part of the mandrel fixture and its bottom surface / upper surface of the upper support packing block / the job and have internal diameter equal to external diameter of the mandrel and is placed in register relation with the mandrel, the said packing ring held firmly between the upper support packing nng and mandrel fixture to secure prevention of any distortion of the mandrel axis.
A still yet another objective of the invention is to provide a small width centrally holed packing ring having internal diameter equal to the external diameter of the thick width ring and external diameter equal to the internal diameter of the job is put up in register relationship with the thicker packing ring and the pinion job to ensure a firm grip of the job with the upper support packing block, mandrel fixture and the mandrel and to prevent any radial and vertical sliding movement of the job once all the parts of the fixture is placed in position and tightened by a nut at the top of the mandrel.

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A still but yet further objective of the invention is to save material cost by reducing parts involved than that of the prior art and in particular by reducing the weight of the job through maintaining its centrally holed diameter about double of the diameter of the mandrel and as different from the job of prior art in which the job was quite heavy to be moved by crane and maintained with centrally bored diameter equal to the mandrel diameter.
From the narrated objectives of the invention it is clear that due to reduction of weights of the parts of the fixture device, the fixture parts and the job can be moved and replaced manually and no crane is required to move the parts of the fixture or the job, thus saving drastically wastage of time in fixing the fixture and the job unlike to that of the prior art fixture wherein excessive time was required for fixing the fixture and a job.
According to the invention there is provided an improved fixture device to hold a pinion job for enhanced production of pinion on drastic reduction of set up time of the fixture elements comprising of: mandrel fixed vertically on machine table, a lower mandrel fixture, a vertical ring, packing rings at the top of the mandrel

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fixture and set up in register with the centrally drilled hole of the pinion job and the mandrel, an upper support packing block and a nut to lock the whole fixture device supported by the mandrel characterized in that the job having a centrally drilled hole of one and half to twice the diameter of the mandrel is supported and aligned at its lower and upper half by two sets of supporting fixture elements; the lower half of the job being supported by a one piece mandrel fixture having at its bottom a projected cylindrical section strongly fixed with the machine table with the help of nuts, a lower support section, a contiguous central projected cylindrical section on which the job is placed and supported, and an upper support section to hold and support the job at its centrally holed lower half surface; a vertical cylindrical ring put up in between the central hole of the job and the top section of the mandrel fixture in register with the job and the mandrel fixture at its outside and inside cylindrical surface to secure the job with firm grip and to prevent any tilting of the bottom of job during cutting operation of the job for pinion producing; the packing rings in combination preventing any radial or vertical displacement of the job; and an upper support packing block with an reduced upper cylindrical section support the job at top, bottom and radially simultaneously with other support elements of the fixture once locked by tightening the nut on the mandrel.

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According to the invention there is also provided a process of preparing an improved fixture device to hold a pinion job for enhanced production of pinion on drastic reduction of set up time of the fixture elements comprising of: preparing a mandrel, a machine table, a mandrel fixture having a projected bottom cylindrical section, a lower supporting section, a contiguous central projected cylindrical section and an upper support section; a vertical cylindrical ring, packing rings, an upper support packing block with a reduced upper cylindrical section and a nut; the fixture device to fix the job is formed by first fixing the mandrel with the machine table by locking with keys through the slots of the machine table; sleeving the one piece mandrel fixture through its central hole at the mandrel and fixing it firmly with the machine table with the help of bolts bolted through the projected cylindrical bottom section and machine table to prevent any resetting of fixture elements once the mandrel fixture is fixed with the machine table; sleeving through their central holes a vertical ring and then a cylindrical packing on the central projected cylindrical section of the mandrel fixture; sleeving through its central hole the pinion job and set on the packing

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rmg and engaged in register relation with the vertical ring upto about half of the height of the job to be supported on the mandrel fixture by its projected cylindrical central section; sleeving through its central hole a thicker packing ring in register with the mandrel and top surface of the upper section of the mandrel fixture and then sleeving through its central hole a thin cylindrical packing ring in register with the thick packing ring, the job and top surface of the vertical ring; setting up a one piece upper packing block by sleeving through its central hole at the mandrel in register engagement with the mandrel and supporting the job at its top, bottom and central hole through the packing rings, vertical cylindrical ring and the mandrel fixture by locking a nut at the top of the mandrel.
SUMMARY OF THE INVENTION
The present invention generates form inventive ingenuity of reducing setting time of fixture device of the pinion job with basic aim for undisturbed cutting operation of gear teeth of pinion once the pinion job is fixed on the fixture

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device. For the same purpose the present fixture device is developed to fix the job on the fixture with inventive features of protecting the job at both of its upper and lower half from any sort of tilting both radially and vertically with the help of a mandrel fixture, upper fixture and packing block and by reducing the weight of the job by drilling higher diameter at its centre to enable deeper cut of gear teeth than that of the existing art and without any stoppage to be required for resetting of the fixture device.
The invention will be better understood as narrated in the follpwing description with the help of the accompanying drawings in which
Figure 1 represents a schematic elevational view of existing fixture device for fixing pinion job.
Figure 2 represents the schematic elevational view of the improved fixture device for fixing a pinion job.

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Figure 3 represents the isometric view of fixing the mandrel on the machine table through key slots.
Figure 4 represents the isometric view of the fixture device
showing the mandrel fixture fixed on the machine table with nuts and bolts on sleeving it on the mandrel.
Figure 5 shows the comparative set up time of the fixture device for a pinion job in the prior art and the present invention.
Figure 6 shows the comparative production of pinions per month using the improved fixture device for the pinions.
Figure 1 shows the prior art fixture device wherein the cylindrical mandrel (9) is first fixed on the circular machine table (1) by locking the mandrel in vertical axial position through key slots on the machine table as shown in Figure 3. A support base (2) and a bottom packing block (3) kept above the support base

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and providing support of the pinion job (5) are sleeved on the mandrel consecutively at first, through their centrally drilled holes. The job (5) is then sleeved on the mandrel and a heavy upper packing block (6) of higher diameter is sleeved on the mandrel (9) to maintain fixing load on the job. Several packing blocks (7) of diminishing diameter are then put up on the heavy packing block (6) one by one and the whole fixture consisting of the support base and upper packing blocks are tightened by nut on the mandrel to lock the fixture device from any tilting due to shearing forces between the assembled parts of the fixture. All the said parts from support base, and packing block including the job have centrally drilled holes equal to the diameter of the mandrel to be sleeved on the mandrel and maintained in register with the mandrel.
As stated earlier the several parts kept in register with the mandrel are prone to disturb the axial position of the mandrel due to shearing between themselves resulting tilting of the mandrel. The situation is further aggravated by the heavy weight job and packing block (6), thus necessitating removing all the parts of the

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fixture including the job and resetting those again on the mandrel after removing the mandrel and relockmg the same in vertical alignment.
This fixture device as stated herein above is therefore not suitable for practice in industrial floor.
Figure 2 shows the improved fixture device in which instead of two parts placed below the job as in the prior art one single piece mandrel fixture (10) is employed.
The mandrel fixture (10) has a round bottom projecting part (15) which is rested on the machine table and firmly fixed on the machine table with the help of several bolts (16) throughout the circumferential position of the machine table and lower projected circular part (15) of the mandrel fixture (10) after the said fixture is sleeved through its central drilled hole at the mandrel in matching relationship with the mandrel. The said mandrel fixture (10) besides the bottom portion (15) has another three sectional parts namely an upper contiguous

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section (17) meeting with a projected cylindrical section (19) and another vertically upward cylindrical section (18) extending from the projected cylindrical section (19). The cylindrical sections (17) and (18) have the same diameter amounting to about double the diameter of the solid cylindrical mandrel (9). The mandrel fixture (10) extending to about half the length of the mandrel put up a firm grip on the mandrel and does not allow the mandrel to be tilted off line to its vertical alignment once the mandrel fixture (10) is bolted with the machine table (1).
On the top of the central projected cylindrical section (19) the pinion job (5) is rested and held tightly with the help of a vertical ring sleeved through the top portion (18) of the mandrel fixture before the job (5) is put up through its central hole in matching relationship with the ring and a radially placed packing ring (20) placed below the job in register with the vertical ring (11) at its bottom. This packing ring (20) is sleeved through the vertical ring (11) after the vertical ring is sleeved through the top half of the mandrel fixture but before the job (5) is sleeved through and supported on the central projected section (19) of the mandrel fixture. The vertical ring (11) having height equal to half of the height

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of the pinion job (5) and extends its height upto to the top surface of the top portion (18) of the mandrel fixture. The top portion (18) of the mandrel fixture in combination with vertical ring (11) and radial packing ring (20) prevent any vertical and radial tilting of the job at its lower half during cutting operation. The vertical ring (11) besides resist any heavy thrust on the mandrel fixture and thus to the mandrel during cutting operation.
The job (5) has centrally drilled hole having diameter equal to one and half to twice the diameter of mandrel and thus pave the way to have much less weight and can be easily moved manually and does not require any crane for its placement as it was required in the existing art.
At the top surface of the mandrel fixture a small width vertical packing ring (13) and a thicker width vertical packing ring (12) are sleeved through the mandrel. The thicker width packing ring (12) has a central hole and its internal diameter surface are placed in matching relationship with the mandrel. The Outer diameter of the small width packing ring (13) is placed in register with the

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internal cylindrical surface of the upper half of the job (5) and its internal cylindrical surface is in register with the external cylindrical surface of the thicker packing ring (12). Both the said cylindrical rings (12 and 13) have height equal to the top half height of the job and both the said rings at their tops are meeting with bottom surface of a one piece (instead of many pieces as in the prior art) upper support packing block (14). The said packing cylindrical rings (12 and 13) placed in between the mandrel fixture, upper support packing block and the top half of the job prevent any vertical and radial tilting of the top half of the job (5) and simultaneously resist any thurst on the mandrel while the job is being cut at its top half. The whole fixture is locked through a nut (8) at the top surface of the upper support packing block (14) and allow the job deeper cut upto the double the amount of gear teeth cut as in the prior art. The amount of cutting depth is shown by a high lighted deep vertical line from the surface of the job as shown in Figure 1 and 2 respectively.
Figure 5 shows a practical data of how the set up time of the fixture has been reduced drastically from prior fixture set up time of 240 mts to present fixture set up time of 9.5 mts.

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Rgure 6 shows another practical data of pinion production from 8 per month of prior art to 29 per month at present i.e. 260 % increase by using the improved fixture device according to the present invention.
The invented fixture device take care of 25 module, 40 module and 50 module pinion jobs with cost saving and time saving characteristics.
The invention as narrated herein though described with a particular embodiment should not be read in a restrictive manner as some modifications, alterations and changes are possible within the scope and limit of the invention as defined in the encampused appended claims.

-19-WE CLAIM
1. An improved fixture device to hold a pinion job for enhanced production of pinion on drastic reduction of set up time of the fixture elements, comprising of:
mandrel (9) fixed vertically on a machine table, a lower mandrel fixture (10), a vertical ring (11), packing rings (12 and 13) at the top of the mandrel fixture and set up in register with the centrally drilled hole of the pinion job (5) and the mandrel, an upper support packing block (6) and a nut (8) to lock the whole fixture device supported by the mandrel characterized in that;
the job (5) having a centrally drilled hole of one and half to twice the diameter of the mandrel is supported and aligned at its lower and upper half by two sets of supporting fixture elements;
the lower half of the job being supported by a one piece mandrel fixture having at its bottom a projected cylindrical section (15) firmly fixed with the machine table (1) with the help of nuts (16), a lower support section (17), a contiguous central projected

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cylmdrical section (19) on which the job is placed and supported, and an upper support section (18) to hold and support the job at its centrally holed lower half surface;
a vertical cylindrical ring (11) put up in between the central hole of the job and the top section of the mandrel fixture in register with the job and the mandrel fixture at its outside and inside cylindrical surface to secure the job with firm grip and to prevent any tilting of the bottom of job during cutting operation of the job for pinion producing;
the packing rings (12 and 13) in combination preventing any radial or vertical displacement of the upper half of the job; and
an upper support packing block (14) with an reduced upper cylindrical section support the job at top, bottom and radially simultaneously with other support elements of the fixture once locked by tightening the nut (8) on the mandrel.

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2. An improved fixture device as Claimed in claim 1, wherein the mandrel
fixture (17) prevents any axial displacement of the mandrel once the said
fixture is sleeved through its central hole in register with the cylindrical
surface of the mandrel covering half the length of the mandrel once the
mandrel is locked in position through key slots in the machine table and
the said mandrel fixture is bolted with the machine table.
3. An improved fixture device as claimed in claim 1, wherein a small width
cylindrical packing ring (20) with a central hole diameter equal to the
diameter of the central hole diameter of the pinion job (5) is set up in
between the central projected section (19) of the mandrel fixture and the
job and set in register relation with the vertical cylindrical ring at its
bottom.
4. An improved fixture device as claimed in claim 3, wherein the external
diameter of the packing ring (20) is slightly in excess of the external
diameter of central section (19) of the mandrel fixture and extending upto
about half the radial length of the job to ensure proper support of job by
the said central section.

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5. An improved fixture device as claimed in the preceeding claims wherein
the said packing ring (20) and the vertical cylindrical ring (11) extending
upto the top surface of the upper section (18) of the mandrel fixture and
equaling about half the height of the job (5) and set in matching relation
with the half of the inside surface of the job in combination prevent any
vertical and radial tilting of the bottom half of the job.
6. An improved fixture device as claimed in the preceeding claims wherein
the upper half of the ]ob at it centre is gripped and supported to be
prevented of any tilting vertically or radially with the help of one thicker
cylindrical packing ring (12) and one thinner packing ring (13).
7. An improved fixture device as claimed in claim 6 wherein inner surface of
the thicker ring (12) is in register engagement with the mandrel at its
surface and the external surface of the said packing ring (12) is set in
register engagement with the inner cylindrical surface of the thinner
packing ring (13) and the outside surface of the thinner packing ring is
set in register engagement with the inner surface of the top half of the
inner surface of the job.

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8. An improved fixture device as claimed in claims 6, 7 and 8 wherein the
said packing rings (12 and 13) are in register engagement with the
bottom surface of the upper support packing block (14) at their top, the
packing (12) being set in register engagement with the top surface of the
upper section (18) of the mandrel fixture at its bottom and the packing
ring (13) being set in register engagement with the top surface of the
vertical cylindrical ring (11) to secure prevention of any misalignment of
the mandrel and thus the job by resisting the thrust generated during
cutting operation of the job.
9. A process of preparing an improved fixture device to hold a pinion job for
enhanced production of pinion on drastic reduction of set up time of the
fixture elements comprising of:
preparing a mandrel (9), a machine table (1), a mandrel fixture (10) having a projected bottom cylindrical section (15), a lower supporting section (17), a contiguous central projected cylindrical section (19) and an upper support section (18), a vertical cylindrical ring (11), packing rings (12 and 13), an upper support packing block (14) with a reduced upper cylindrical section and a nut;

-24-
the fixture device to fix the job is formed by first fixing the mandrel (9) with the machine table (1) by locking with keys through the slots of the machine table;
sleeving the one piece mandrel fixture through its central hole at the mandrel and fixing it firmly with the machine table (1) with the help of bolts (16) bolted through the projected cylindrical bottom section (15) and machine table (1) to prevent any resetting of fixture elements once the mandrel fixture is fixed with the machine table;
sleeving through their central holes a vertical ring (11) and then a cylindrical packing (20) on the central projected cylindrical section (19) of the mandrel fixture;
sleeving through its central hole the pinion job (5) and set on the packing ring (20) and engaged in register relation with the vertical ring (11) upto about half of the height of the job to be supported on the mandrel fixture by its projected cylindrical central section (19);

-25-
sleeving through its central hole a thicker packing ring (12) in register with the mandrel and top surface of the upper section (18) of the mandrel fixture and then sleeving through its central hole a thin cylindrical packing ring (13) *n register with the thick packing ring, the job and top surface of the vertical ring (11);
setting up a one piece upper packing block (14) by sleeving through its central hole at the mandrel in register engagement with the mandrel and supporting the job at its top, bottom and central hole through the packing rings, vertical cylindrical ring and the mandrel fixture by locking a nut (8) at the top of the mandrel.
10. An improved fixture device to hold a pinion job for enhanced production of pinion on drastic reduction of set up time of the fixture elements and a process of preparing the same as herein described and illustrated.
This invention relates to an improved fixture device to hold a pinion job for enhanced production of pinion on drastic reduction of set up time of the fixture elements; and a process of preparing the same. The present invention generates form inventive ingenuity of reducing setting time of fixture device of the pinion job with basic aim for undisturbed cutting operation of gear teeth of pinion once the pinion job is fixed on the fixture device. For the same purpose the present fixture device is developed to fix the job on the fixture with inventive features of protecting the job at both of its upper and lower half from any sort of tilting both radially and vertically with the help of a mandrel fixture (10, 1, 15, 17, 18, 12), upper fixture (11, 12, 13) and packing block (14) and by reducing the weight of the job by drilling higher diameter at its centre to enable deeper cut of gear teeth than that of the existing art and without any stoppage to be required for resetting of the fixture device.