Title of Invention

"AN IMPROVED WRAPPING MACHINE."

Abstract

This invention relates to an improved wrapping machine characterized in that atleast two stationary cam plate (19 & 20) and a plurality of pusher assembly having a fixed jaw (1) and a swinging jaw (2) spring loaded towards the fixed jaw wherein the swinging jaw is disposed with atleast two rollers (17 & 18) mounted on opposite sides, the pusher assembly ascents between two parallel indexing pocket wheel (3) carrying the product so as to grip the product from front and back.

Full Text

FIELD OF INVENTION This invention relates to an improved wrapping machine. PRIOR ART Multiple pocket indexing wheel is commonly used in wrapping machines to transfer the product through 180°C (typically). In the intermediate stations some wrapping operations may be done, alternatively, product is just transferred to 180° opposite position from where it is discharged by means of either a continuously moving pusher conveyor or a suitable reciprocating pusher mechanism during the stationery position of the indexing pocket of the wheel wherein choice of type of discharge depends upon application. These mechanisms are fairly well known and do not need elaboration here. However, where a continuously moving discharge conveyor is used, arrangement is typically as shown in fig. 1. Pocket wheel shown here with six pockets indexes by 60° every cycle to reach station D after having received the product at station A. After every indexing, the wheel dwells in stationary position, during which period pushers 2 (fig. 1) that pass through the gap between two sides of the pocketed wheel, push the products out of the pocket and carry these forward as shown. These pushers are equispacedly mounted on a roller chain driven over sprocket (3) fig. 1. This is a commonly used arrangement of discharging products from the pocket wheels. Disadvantage associated with the known art is that the product cannot be gripped from both sides as it is conveyed along by the pushers. This may amount to serious drawback when wrapping operation is required to be carried out during its forward movement, because without positive grip over the product and wrapper there is a tendency of loosening or skewing of the wrapper during folding operation. OBJECTS OF THE INVENTION An object of the present invention is to propose an improved wrapping machine having provision for gripping the product being discharged from a pocketed wheel from both sides. Another object of this invention is to propose an improved wrapping machine which avoids the risk of loose or skewed wrapping during the folding operation. Further object of this invention is to propose an improved wrapping machine in which the product progresses well gripped by the pushers mounted on a roller chain. STATEMENT OF INVENTION According to this invention there is provided an improved wrapping machine comprising atleast two stationary cam plate and a plurality of pusher assembly having a fixed jaw and a swinging jaw spring loaded towards the fixed jaw wherein the swinging jaw is disposed with atleast two rollers mounted on opposite sides, the pusher assembly ascents between two parallel indexing pocket wheels carrying the product from so as to grip the product front and back. BRIEF DESCRITPION OF THE ACCOMPANYING DRAWINGS Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein: Fig. 1 shows: front elevation of wrapping machine known in art. Fig. 2 shows: front elevation of wrapping machine of the present invention. Fig. 3 shows: details of drive sprockets as shown in fig. 2. Fig. 4 shows: details of attachment of pusher jaw with roller chains as shown in fig. 2. DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS The improved wrapping machine ot the present invention comprising of a plurality of pusher assemblies mounted on roller chains (14 and 15). Pusher assembly having two components; a fixed jaw (1) and swinging jaw (2) with a fulcrum at (A), which is spring loaded towards the fixed jaw. Fixed jaw is carried on two pins (4) and (5). Pin (4) is attached to a roller chain (14) moving over sprockets (7, 8, 9 and 6) and pin 5 is likewise attached to a roller chain that moves over sprockets (10, 11, 12 and 13). Sprockets (6 and 10) are drive sprockets, whereas other sprockets are driven. Combination of sprockets (6, 7, 8, 9) with chain thereon carrying pin (4) is horizontally displaced with respect to sprockets (10, 11, 12 and 13) over which chain carrying pin (5) is supported by a distance equal to the distance between the centers of pins (4) and (5). This geometry ensures that pusher assembly during its ascent towards pocket wheel (3) and descent over sprockets (9 and 10) remains upright with jaw (1) always remaining vertical. Details of attachment of pusher jaw (1) with roller chains (14 and 15) are shown in Fig. 4. Roller chains and fixed pusher jaws are guided over rails (1 and 2) as shown in fig. 4, which are mounted on a plurality of bridge pieces (3). Driven sprockets (8 and 12) of fig. 2 are free to rotate over stub shafts (4 and 5). Similar arrangement is provided for sprockets (9 and 13) as shown in fig. 2. Sprockets (7 arid 11) fig. 2 are mounted on stub shafts that are fixed to adjustable blocks (16) fig. 2 to take up the slack in roller chains. Details of drive sprockets (6 and 10) in fig. 2 are shown in fig. 3. These sprockets are integral with spur gears of suitable diameter and are free to rotate over stub shafts (3 and 4) fig. 3. These gear-sprocket combinations are driven by gears (1 and 2) respectively. These gears are mounted on shaft (5) fig. 3 which gets driven though sprocket (6). Swinging jaw (2) as shown in fig. 2 is fulcrumed at (A) on fixed jaw (1). Position of fulcrum is chosen to provide accurate grip on the product when jaw (2) gets closed by the spring force towards fixed jaw. Swinging jaw carries two rollers (17 and 18) mounted on opposite sides. Roller (17) hits stationary cam plate (19) on the ascent of pusher assembly, thus opening the swinging jaw by rotating it in counter clockwise direction wherein the plate (19) is inclined at an angle of for example 30°. This prevents any collision between the swinging jaw and the product in the pocket of indexing wheel (3). Pocket wheel carrying the product is made of two plates with pockets joined together with enough gap between them to allow the pusher assembly to pass through it. Pusher assembly, thus ascends through the gap between two plates forming the pocket wheel, till its fixed jaw makes contact at the back of the product, whereas swinging jaw is in the open position because of the interaction of roller (17) with plate (19). Product is thus pushed out of the pocket wheel while it is dwelling in rest position between the indexing movements. Inclination of plate (19) allows the swinging jaw to rotate clock-wise to grip the product from front with spring force as the pusher advances. At the delivery end, roller (18) which is mounted on the swinging jaw hits stationary cam plate (20) provided at an angle of for example 90°. This action rotates the swinging jaw anti clockwise to release the grip on product before the descent of the jaw begins. It is to be understood that the present invention is susceptible to modification, changes, adaptations by those skilled in the art. Such modifications, changes and adaptations are intended to be within the scope of the present invention, v/hich is further set forth under the following claims: I CLAIM 1. An improved wrapping machine characterized in that atleast two stationary cam plate (19 & 20) and a plurality of pusher assembly having a fixed jaw (1) and a swinging jaw (2) spring loaded towards the fixed jaw wherein the swinging jaw is disposed with atleast two rollers (17 & 18) mounted on opposite sides, the pusher assembly ascents between two parallel indexing pocket wheel (3) carrying the product so as to grip the product from front and back. 2. An improved wrapping machine as claimed in claim 1 wherein the pusher assemblies are mounted on roller chains (14 and 15). 3. An improved wrapping machine as claimed in claim 1 or 2 wherein the fixed jaw is carried on two pins (4 and 5) attached to respective roller chain, which moves over respective set of sprockets (6-9 and 10-13). 4. An improved wrapping machine as claimed in claim 3 wherein a set of sprockets (6-9) over which first chain carrying pin (4) is carried is horizontally displaced with respect to another set of sprockets (10-13) over which second carrying pin (5) is carried out by a distance equal to the distance between the centers of two pins (4 and 5). 5. An improved wrapping machine as claimed in any of the preceding claims wherein the roller chains and fixed pusher jaws are guided over rails (1 and 2), which are mounted on a plurality of bridge pieces (3). 6. An improved wrapping machine as claimed in any of the preceding claims wherein sprockets (8 and 12, 7 and 11, and 9 and 13) are mounted on stub shafts (4 and 5) wherein the stub shafts of the sprockets (7 and 11) are fixed to adjustable blocks (16). 7. An improved wrapping machine as claimed in any of the preceding claims wherein the stationary cam plate (19) is provided ahead of the multiple pocketed wheel (3) at any angle of for example 30°. 8. An improved wrapping machine as claimed in any of the preceding claims wherein a stationary cam plate (20) is provided at the delivery end at an angle of for example 90°. 9. An improved wrapping machine substantially as herein described and illustrated with reference to the accompanying drawings.

Documents:

1800-DEL-2006-Abstract-(12-08-2008).pdf

1800-del-2006-abstract.pdf

1800-DEL-2006-Claims-(12-08-2008).pdf

1800-del-2006-claims.pdf

1800-DEL-2006-Correspondence-Others-(12-08-2008).pdf

1800-del-2006-correspondence-others.pdf

1800-del-2006-correspondence-others1.pdf

1800-del-2006-correspondence-po.pdf

1800-del-2006-description (complete)-12-08-2008.pdf

1800-del-2006-description (complete).pdf

1800-del-2006-drawings.pdf

1800-del-2006-form-1.pdf

1800-del-2006-form-18.pdf

1800-DEL-2006-Form-2-(12-08-2008).pdf

1800-del-2006-form-2.pdf

1800-DEL-2006-Form-3-(12-08-2008).pdf

1800-del-2006-form-9.pdf

1800-del-2006-gpa.pdf

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