The present disclosure relates to the field of fixtures in gear roofing machines.
DEFINITIONS
Dog element - The term "Dog element" hereinafter in the complete specification refers to a tool that prevents movement of an object by engaging with the object.
BACKGROUND
A gear roofing machine is used for chamfering gears to facilitate smooth gear transmission when the gears are in use. Conventionally, a gear to be chamfered is mounted on the gear roofing machine using a fixture. The fixture includes a slot which receives a dog element. The dog element helps to prevent rotational movement of the gear while the gear roofing process is being conducted on the gear.
The gear roofing machine has a roofing tool that is programmed to chamfer a gear with a specific number of teeth. For chamfering another gear, the programming and setup of the roofing tool need to be changed. Thus, it is necessary to mount a gear with correct number of teeth for which the roofing tool is programmed. The mounting of a gear with incorrect number of teeth results in rejection of the gear during quality checks as the roofing operation is not accurately performed. Conventionally, to avoid the erroneous mounting of a gear with incorrect number of teeth, number of tooth of all gears is counted before mounting on the gear roofing machine. This process of counting the gear teeth is laborious and time consuming. Despite these efforts, there still remains a possibility of mounting a gear with incorrect number of teeth on the fixture. This results in ruptured roofing tool and the damaged gear.
Therefore, there is felt a need of a fixture that alleviates the aforementioned problems associated with gear roofing machines and assures mounting of a correct gear during a roofing operation.

Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
An object of the present disclosure is to provide a fixture that prevents mounting of an inappropriate gear on a gear roofing machine, thereby reducing rejection rate of gears during manufacturing thereof.
Another object of the present disclosure is to provide a fixture that is simple in configuration.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure envisages a fixture for preventing mounting of an inappropriate gear on a gear roofing machine. The fixture comprises a planar element having a circular cross-section. The planar element is axially connected to a spindle of the gear roofing machine. A plurality of slots is radially configured on the planar element. Two dog elements are configured to be received in the predetermined slots corresponding to a gear having a specific number of teeth, thereby permitting only the gear to be mounted on the gear roofing machine.
In an embodiment, the distance between the predetermined slots corresponds to a pitch circle diameter of the gear to be mounted on the gear roofing machine. In another embodiment, each of the dog elements is secured to the body via a fastener.
The fixture includes a sensor configured to sense the placement of at least one of the dog elements in the predetermined slot. The sensor is configured to generate a placement signal to actuate the gear roofing machine. In an embodiment, the

sensor is selected from the group consisting of a proximity sensor, an ultrasonic sensor, an infrared sensor, and an electromagnetic sensor.
In yet another embodiment, each of the dog elements has an L-shaped configuration.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
A fixture for preventing mounting of an inappropriate gear on a gear roofing machine, of the present disclosure, will now be described with the help of the accompanying drawing, in which:
Figure 1 illustrates an isometric view of a conventional fixture for a gear roofing machine;
Figure 2 illustrates a top view of a fixture, in accordance with an embodiment of the present disclosure;
Figure 3 illustrates a isometric view of the fixture of figure 2; and
Figure 4 illustrates another isometric view of the fixture of figure 2.
LIST OF REFERENCE NUMERALS
50, 60 - Gear
100 - Conventional fixture
105 - Body of the conventional fixture
110-Slot
115 - A plurality of holes
120 - Dog element
200 - Fixture

205 - Planar element
210A-First slot
21 OB - Second slot
2IOC-third slot
215A, 215B -Dog elements
218, 222-Fasteners
220 - Holes
240 - Spindle
250 - Sensor
DETAILED DESCRIPTION
Figure 1 illustrates an isometric view of a conventional fixture 100 (hereinafter also referred to as fixture 100). The fixture 100 is connected to a spindle (not shown in figures) of a gear roofing machine (not shown in figures) by means of a plurality of holes 115 and fasteners (not specifically labelled in figures). The fixture 100 comprises a slot 110 configured on a body 105 of the fixture 100. A dog element 120 is received in the slot 110 when a gear 50 is mounted on the gear roofing machine. The dog element 120 prevents rotational movement of the gear 50 during roofing operation. A roofing tool (not shown in figures) of the gear roofing machine is programmed to chamfer a gear with a specific number of teeth. For chamfering another gear, the programming and setup of the roofing tool need to be changed. However, the fixture 100 does not have any provision to prevent mounting of an inappropriate gear. Conventionally, an operator manually counts number of teeth of a gear to be mounted on the gear roofing machine, and then mounts the gear on the gear roofing machine. This may result in mounting of a gear with different number of teeth on the machine which further results in

rejection of the gear during quality check procedures. Further, the process of
counting gear teeth is laborious and time consuming. If the difference between
numbers of teeth of two gears is very small, for example, one gear has 19 teeth
and other gear has 20 teeth, an operator tends to make incorrect counting which
5 results in mounting of an inappropriate gear on the gear roofing machine. This
also results in ruptured roofing tool and damaged gear.
The fixture, of the present disclosure, is configured to prevent mounting of an
inappropriate gear on a gear roofing machine. The fixture, of the present
disclosure, is now described with reference to figure 2 through figure 4. Figure 2
10 illustrates a top view of a fixture 200, in accordance with an embodiment of the
present disclosure. Figure 3 illustrates an isometric view of the fixture 200. Figure 4 illustrates another isometric view of the fixture 200.
The fixture 200 comprises a planar element 205. The planar element 205 forms a
body of the fixture 200. Further, the planar element 205 is defined by a circular
15 cross-section, and is axially connected to a spindle 240 of a gear roofing machine
(not shown in figures) using a plurality of fasteners 222. A plurality of holes 220 is configured on the planar element 205 to receive the plurality of fasteners 222, thereby axial connecting the planar element 205 with the spindle 240.
The fixture 200 includes a plurality of slots (210A, 210B, and 210C) radially
20 configured on the planar element 205. In an embodiment, the fixture 200 includes
a first slot 210A, a second slot 210B, and a third slot 210C.
Further, the fixture 200 includes two dog elements 215A, 215B configured to be
received in predetermined slots (210A and 210B or 210C) corresponding to a gear
60 having a specific number of teeth. This permits only the gear 60 to be mounted
25 on the gear roofing machine. More specifically, the position of slots 210A, 210B,
and 210C corresponds to a pitch circle diameter of gears to be mounted on the gear roofing machine. When the dog elements 215A and 215B are received in two slots 210A, 210B, or 210C, only a particular gear can be mounted on the gear
6

roofing machine. No other gear having different number of teeth can be mounted on the gear roofing machine.
The distance between the predetermined slots 210A, 210B, and 210C corresponds
to a pitch circle diameter of a gear to be mounted on the gear roofing machine.
5 More specifically, the distance between the first slot 210A and the second slot
210B corresponds to a pitch circle diameter of a gear with specific number of
teeth. The distance between the first slot 210A and the third slot 210C
corresponds to a pitch circle diameter of another gear having different number of
teeth. It is to be noted that the number of slots configured on the planar element
10 205 is dependent upon gears of different number of teeth to be mounted on the
gear roofing machine.
The positions of the first slot 210A and the second slot 210B are determined so
that when a specific gear, for which the first slot 210A and the second slot 210B
are configured, is mounted on the gear roofing machine via the fixture 200, a
15 portion of the dog elements 215A and 215B is received in grooves of the specific
gear. The positions of the first slot 210A and the second slot 210B are determined in aforementioned manner for mounting a gear having different number of teeth.
In an embodiment, each of the dog elements 215A and 215B has an L-shaped
configuration defined by a first portion (not specifically labelled in figures) and a
20 second portion (not specifically labelled in figures). The first portion and the
second portion are orthogonal to each other. Further, the first portion of each of the dog elements 215A and 215B is received in predetermined slots 210A, 210B or 210C and can be secured to the slots 210A, 210B or 210C via fasteners 218.
The fixture 200 further includes a sensor 250. The sensor 250 is configured to
25 sense the placement of at least one of the dog elements 215A, 215B in
predetermined slots 210A, 210B or 210C. The sensor is configured to generate a placement signal, when at least one of the dog elements 215A, 215B is received in predetermined slots 210A, 210B or 210C, to actuate the gear roofing machine. Further, a control unit (not shown in figures) is disposed on the fixture 200 or the
7

gear roofing machine. The control unit is configured to receive the placement signal. The control unit is in communication with an actuator of the gear roofing machine, and is configured to actuate the gear roofing machine when the placement signal is received. The arrangement of the sensor 250 prevents usage of 5 the gear roofing machine, if one of the dog elements 215A or 215B is not in place. Thus, an operator can not operate the gear roofing machine by bypassing the step of placing the dog elements 215A or 215B in predetermined slots 210A, 210B or 210C.
The sensor 250 is selected from the group consisting of a proximity sensor, an 10 ultrasonic sensor, and infrared sensor, and an electromagnetic sensor.
The second slot 210B and the third slot 210C correspond to two gears having different number of teeth. For mounting a first gear having „A‟ number of teeth, the dog element 215A is secured to the first slot 210A and the dog element 215B is secured to the second slot 210B which corresponds to the first gear. The first 15 gear is then mounted on the fixture 200 such that the second portion of each of the dog elements 215A and 215B is received in groove of the first gear. In such a configuration, no other gear having different number of teeth than that of the first gear can be mounted on the fixture 200 as the second portion of the dog elements 215A, 215B can not be received in grooves of the other gear.
20 For mounting a second gear having „B‟ number of teeth, the dog element 215B is secured to the third slot 210C which corresponds to the second gear. The second gear is then mounted on the fixture such that the second portion of each of the dog elements 215A and 215B is received in groove of the second gear. In such a configuration, no other gear having different number of teeth than that of the
25 second gear can be mounted on the fixture 200 as the second portion of the dog elements 215A, 215B can not be received in grooves of the other gear. Thus the fixture 200 prevents the mounting of an inappropriate gear on the gear roofing machine.
8

An operator can not bypass the secure positioning of the dog elements 215A, 215B, as the gear roofing machine can not be operated without the placement of the dog elements 215A, 215B in predetermined slots 210A, 210B or 210C.
The fixture of the present disclosure has a simple configuration, and can be 5 operated even by an unskilled labour.
TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a fixture that:
• prevents mounting of an inappropriate gear on a gear roofing machine, 10 thereby reducing rej ection rate of gears during manufacturing thereof; and
• is simple in configuration.
The foregoing disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
15 The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways
20 in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, 25 readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning
9

and range of equivalents of the disclosed embodiments. It is to be understood that
the phraseology or terminology employed herein is for the purpose of description
and not of limitation. Therefore, while the embodiments herein have been
described in terms of preferred embodiments, those skilled in the art will
5 recognize that the embodiments herein can be practiced with modification within
the spirit and scope of the embodiments as described herein.
Throughout this specification the word “comprise”, or variations such as
“comprises” or “comprising”, will be understood to imply the inclusion of a stated
element, integer or step, or group of elements, integers or steps, but not the
10 exclusion of any other element, integer or step, or group of elements, integers or
steps.
The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
15 Any discussion of documents, acts, materials, devices, articles or the like that has
been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date
20 of this application.
The numerical values mentioned for the various physical parameters, dimensions
or quantities are only approximations and it is envisaged that the values
higher/lower than the numerical values assigned to the parameters, dimensions or
quantities fall within the scope of the disclosure, unless there is a statement in the
25 specification specific to the contrary.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred
10

embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

WE CLAIM

A fixture (200) for preventing mounting of an inappropriate gear on a gear roofing machine, said fixture (200) comprising:
a planar element (205) having a circular cross-section, and axially connected to a spindle (240) of said gear roofing machine;
a plurality of slots (210A, 210B, 210C) radially configured on said planar element (205); and
two dog elements (215A, 215B) configured to be received in predetermined slots (210A, 210B, 210C) corresponding to a gear having a specific number of teeth, thereby permitting only said gear to be mounted on said gear roofing machine.
The fixture (200) as claimed in claim 1, wherein distance between said predetermined slots (210A, 210B, 210C) corresponds to a pitch circle diameter of said gear to be mounted on said gear roofing machine.
The fixture (200) as claimed in claim 1, wherein each of said dog elements (215 A, 215B) is secured to said planar element (205) via a fastener.
The fixture (200) as claimed in claim 1, which includes a sensor (250) configured to sense the placement of at least one of said dog elements (215A, 215B) in said predetermined slot (210A, 210B, 210C), and further configured to generate a placement signal to actuate said gear roofing machine.

The fixture (200) as claimed in claim 4, wherein said sensor (250) is selected from the group consisting of a proximity sensor, an ultrasonic sensor, an infrared sensor, and an electromagnetic sensor.
The fixture (200) as claimed in claim 1, wherein each of said dog elements (215 A, 215B) has an L-shaped configuration.