WO2023175630A1

WO2023175630A1 - A paper sheeter machine with improved air shower assembly and method thereof

Info

Publication number: WO2023175630A1
Application number: PCT/IN2023/050246
Authority: WO
Inventors: Udaykumar Chhabildas PATEL
Original assignee: Patel Udaykumar Chhabildas
Priority date: 2022-03-16
Filing date: 2023-03-15
Publication date: 2023-09-21

Abstract

<b>A PAPER SHEETER MACHINE WITH IMPROVED AIR SHOWER ASSEMBLY AND METHOD OF OPERATING IT</b> The present invention relates to a paper sheeter with air shower assembly for overlapping unit (14) comprising an air blow nozzle (57), an air blow (58) connected in series with an air blow nozzle (57) through a common chamber, and an air shower assembly (56). The air shower assembly (56) presses down the trailing edge of leading sheet (512) by pressurized air jet (510) through a series of solenoid valves (59), operates as high frequency to perform on or off function, and the air blow nozzle (57) raises the leading edge of trailing sheet (511) through air blow (58). The switching operation of air shower (56) and air blow (58) is synchronized with speed of machine and format size of sheet controlled by PLC. This system provides maximum efficiency and obtains the result of maximum overlapping of sheets.

Description

A PAPER SHEETER MACHINE WITH IMPROVED AIR SHOWER ASSEMBLY AND METHOD THEREOF

Field of invention:

The present invention relates to a paper sheeter machine and more particularly it relates to the paper sheeter machine with improved air shower assembly for overlapping unit.

Background of the invention:

An overlapping unit is used in paper sheeter machines for overlapping desired cut sized sheet in order to prepare the stack of sheets on a commercial scale is generally known in the art. The known paper sheeter machine apparatus available to take a web from a roll of paper, cut the web into individual sheets, and then arrange the cut sheets in an overlapping.

In US patent application no. US20030218292A1, the apparatus has a lifting member connected to the conveyance member to raise and lower the conveyance member about the pivotal connection to the source of the stream of overlapping sheets. The lifting member can be a hydraulic lift. The lifting member is connected to the portion of the conveyance member pivotally connected to the source of the stream of overlapping sheets. In operation, when the conveyance member is in a lowered position a portion of the conveyance member away from the portion pivotally connected to the source of the stream of overlapping sheets can be swung upwardly about the pivotal connection between the portions. Another US patent application no. US005275394A disclosed a sheet feeding apparatus with a cross-cutter in front and an arrangement, following the cross-cutter, for forming a series of underlapping sheets with lifting and holding elements in a region between two withdrawal devices driven at different feed speeds. These elements lift the rear end of each sheet to form a lead-in gap for the following sheet. The lift and holding elements are fastened, furthermore, to continually driven transport elements and are kept on a straight path in the engagement area slightly delayed relative to the following withdrawal device. The lift and holding elements are uniformly distributed across the width of the sheet, and are fastened to a strip picked up by chains located on the side. Several strips are provided spaced at sheet-to-sheet spacing. The track of the lift and holding elements descends slightly in the transport direction. The strips connected to the lateral chains are guided in lateral rails which are adjustable.

The main drawback associated with the mechanical sheet overlapping method is that the method is not easy to operate and maintain as well as the system undergoes complex construction and method to perform the task as the lifting and holding elements can cause creasing in the sheet which further lead to false operation in the machine and the end product is undesired output. In order to overcome aforesaid wear and tear, the overlapping unit in paper sheeter machine needs easy operative and maintainable system where replacement of lifting and holding mechanism is required. Hence, there is a need to introduce an improved air shower assembly in the overlapping unit of paper sheeter machine which overcomes the drawbacks associated with the mechanical lifting and holding elements.

Object of invention:

The main object of the present invention is to provide a paper sheeter machine with an improved air shower assembly which achieve maximum efficiency and obtain the result of maximum overlapping of sheets.

Another object of the present invention is to provide a paper sheeter machine with an improved air shower assembly for overlapping unit where switching of air shower and air blower is synchronized with speed of machine and format size of sheet.

Further object of the present invention is to provide a paper sheeter machine with an improved air shower assembly for overlapping unit which will provide maintenance free operation.

One more object of the present invention is to provide a paper sheeter machine with an improved air shower assembly that will be cost effective sheeting with accuracy.

Further object of the present invention is to provide a paper sheeter machine with an improved air shower assembly that is free from the drawbacks of the conventional overlapping unit. Brief description of drawings:

Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.

Figure 1(a) shows an orthographic top view of different embodiments of paper sheeter machine according to the present invention.

Figure 1(b) shows an orthographic side view of different embodiments of paper sheeter machine according to the present invention.

Figure 2 shows an isometric right view of the unwinding unit according to the present invention.

Figure 3 shows a perspective view of the de-curling unit according to the present invention.

Figure 4(a), 4(b), 4(c), 4(d), 4(e) and 4(f) shows a perspective view of the slitting with digital Synchro cutting unit according to the present invention.

Figure 5(a), and 5(b) shows a perspective view of an improved air shower assembly for overlapping unit according to the present invention

Figure 5(c) shows an internal diagram of an improved air shower assembly for overlapping unit according to the present invention.

Figure 6 shows an isometric side view of the pile delivery unit according to the present invention.

Summary of the invention

The present invention relates to a paper sheeter with improved air shower assembly for overlapping unit comprises an air blow nozzle, an air blower is connected in series of air blow nozzle through a common chamber, an air shower assembly. The air shower assembly presses down the trailing edge of leading sheet by pressurized air jet through a series of solenoid valves operates at high frequency to perform on or off function and the air blow nozzle raises the leading edge of trailing sheet through air blow. The switching operation of air shower and air blow is synchronized with speed of machine and format size of sheet controlled by PLC. This system provides maximum efficiency and obtains the result of maximum overlapping of sheets.

Detailed description of the invention:

Before explaining the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the construction and arrangement of parts illustrated in the accompany drawings. The invention is capable of other embodiments, as depicted in different figures as described above and of being practiced or carried out in a variety of ways. It is to be understood that the phraseology and terminology employed herein is for the purpose of description and not of limitation.

The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

It is to be also understood that the term "comprises" and grammatical equivalents thereof are used herein to mean that other components, ingredients, steps, etc. are optionally present. For example, an article "comprising" (or "which comprises") components A, B, and C can consist of (i.e., contain only) components A, B, and C, or can contain not only components A, B, and C but also contain one or more other components.

Now, according to exemplary embodiment shown in fig. 1(a) and 1(b), the paper sheeter machine comprises of a twin unwinder unit (11), a decurling unit (12) connected to the downstream of the unwinder unit (11), a slitting and synchro cutting unit (13) located at the downstream of the de-curling unit (12), an overlapping unit (14) with an improved air shower assembly fixed after the slitting and synchro cutting unit (13), a pile delivery unit (15) with motorized or manual size changing system located downstream to the overlapping unit (14), an main control panel (16) connected at the drive side (1) of the paper sheeter machine, an auto pallet changer unit (17) connected below to the pile delivery unit (15), and an automatic track & trolley unit (18) located at the operating side (2) which is mounted on the ground surface just below to the unwinding unit (11) of the paper sheeter machine.

Fig. 2 shows the unwinding unit (11) comprises an control panel (22) fixed at operating side (2) of the unwinder assembly (11), an unwinding stand (23) mounted besides of the control panel (22) holds the paper reel (25) that determines the quality and amount of each type of paper to be cut and unwind required length of paper with uniform tension to ensure accurate web cutting process, an fork arm (24) mounted on the unwinding stand (23) equipped with a core chuck (28) to hold the paper reel (25), a hydraulic power pack (29) connected with a hydraulic cylinder (27) at the drive side (1) is provided for up and down movement of the fork arm (24), an electro-pneumatic brake (210) equipped at the both ends of the fork arm (24) which is operated according to the signal received from the controller due to change in the reel diameter, a limit switch for maximum (215) and minimum (214) web size conditions are mounted on the top most surface of the unwinding stand (23) which restrict the maximum and minimum movement of the fork arm (24), a slicing and joining assembly (26) located at the downstream of the paper reel unwinding assembly which comprises a web clamp (211) on a paper support sheet (212), a paper slicing arrangement (213), and a decreasing roller assembly (21) which used to pass paper from reel stand to the de-curling unit (12) and removes the creases from the paper and control the web tension due to grammage variation through the web length. The track and trolley system (18) located below to the paper reel (25) performs loading and unloading of the reel.

According to the embodiment, the unwinder unit (11) can be supplied with two options i.e. manual & automatic track and trolley system. In the manual mode, all the operation of reel loading, reel centering, empty core removal, the fork (24) up-down and forward reverse movement is control by push buttons and selector switches (not shown) provided on the unwinder control panel (22). While in automatic mode, all the operation from reel centering to new reel loading is done by single selector switch provided on control panel (22) by putting it in auto mode. All the necessary sensors, photocells and limit switches are provided in machine wherever necessary to load the reel (25) in auto mode.

The paper reel (25) diameter based auto web tension controller is mainly responsible for control of web tension and is located on the unwinding reel fork arm (24). This controller ensures better web tension handling from unwinding up to its final products. This system work is based on the individual control of the brake pressure proportional to the diameter of each unwinding reel (25). With this system, it is possible to establish the range of maximum and minimum pressure for the unwinding process. The unwinder unit fork arm (24) is equipped with senor (not shown) and sensing disk which is mounted on an axial pin of the fork arm (24). As the paper reel (25) rotates during unwinding process, sensor generates pulses and provides it to the main control system (16). Main controller receives the signal from proximity sensor and based on that signals and running speed of web, controller calculates the exact reel diameter on starting of new reel and it also calculates RPM of reel. Based on data of pulse from sensor and web speed, reduction of reel diameter is calculated and accordingly controller command to the pneumatic brakes (210) of each reel. And accordingly, web tension is controlled proportional to reel diameter.

The slicing and joining assembly (26) is provided for joining the paper at the end of each reel. When reel is empty, operator stop the machine and clamp the existing web by web clamp (211) on paper support sheet (212). Then slicing of the paper is done at paper slicing arrangement (213). It helps operator to load the new reel very quickly and prevent the paper passing procedure every time of loading a new reel.

Now according to embodiments of the invention illustrated in fig. 3, when the reel diameter sensor sense the paper reel diameter at the unwinder unit (11), it generates signal and based on the signal, actual position of decurling bars (33) are decided. Overall swing angle of de-curler is limited by a proximity sensor (31) and is controlled with the help of a gearbox (32) mounted at the end of de-curling bars (33). As the running reel diameter decreases, the degree of curling in paper increases and it is overcome by swinging whole decurling bar (33)/rod (34) throughout the paper. An edge senor assembly (35) is used for web (37) align, and it is adjustable for all size of web width. A static bar (38) is provided just below the de-curling assembly (12) to remove the static charge generated in paper. A splice detector system (36) is located before the slitting section (13) mounted vertically downward just above the web path to identify the splice joints within the web. Now web common bridge combines the entire web and passes it into the slitting & synchro cutting unit (13).

As shown in fig. 4(a), 4(b), 4(c), 4(d) and 4(e), the slitting with digital synchro cutting unit (13) is located downstream to the main web pulling device and also before the digital synchro unit to allow edge trimming and center slitting of the web. When the entire web (37) is passed by the web common bridge, the slitting unit (13) cut the paper into the required size in longitudinal way. The said unit is operated in two modes: manual slitting and automatic slitting. Referring to fig. 4(a), in manual slitting mode, the slitting unit comprises of a slitter station which comprises slitting function units. The slitter station consists of a top block-knife (42) and a bottom block-knife (44) which is located at machine. All the block-knives are moved and positioned manually. The top slitter knives (42) have been working through pneumatic functions. The said slitter knives (42) are attached to a pneumatic holder (41) that can be adjusted vertically. Said pneumatic top slitter knives (42) in turn interact with the bottom knives (44) to complete the slitting action. Both said bottom (44) and top slitter knives (42) should be positioned to have an overlapping clearance of about 1.6 mm for more effective trimming and slitting functions. Further, center slitting is used when there is more than one cut is producing from the web. If there is only one cut is produced from the web, then move the top knife holder (41) in upward direction. A trim exhaust duct (47a) is attached together with this slitting system for collection of waste produced by the edge trimming with the help of blower. The method of manual operation of slitting comprises of following steps. Firstly, loose both the locking handles (46) provided at each top knife holder plates (47). Then after, the top knife holders (41) can be slide left or right by rotating the handwheel (45) provided at the top of each knife holder plate assembly (47). Now, adjust it as per the sheet cut sizes and number of sheets to cut. Then to adjust the bottom knives (44), loosen the bottom sleeves (43) and slide the knife (44). After that, adjust the bottom knives (44) according to the top knives (42) and lock it by the bottom sleeve (43). It is to be understood that the manual positioning of the knives (42 and 44) can only be occur when the machine is stooped. Now, referring to fig. 4(b), 4(c), 4(d) and 4(e), in automatic slitting mode, the slitting unit comprises plurality of bottom knives (44aa) are included in the system that are securely locked or positioned by an air shaft (47b). Said bottom knives (44aa) are driven by a timing pulley (417) and belt drive from a main pulling roll (420). A bottom slitting holder (44a) is mounted on linear guide and movement of slitter knife is controlled through stepper motor which receives command from PLC controller to stepper driver. A magneto strictive positioning sensor is located below the bottom slitter holder (44a) and a magnet (44b) is attached with the bottom knife holder (44a) which senses the position of the bottom knife (44aa). An air shaft (47b) is configured to drive the bottom slitter through the timing pulley (417). The sheet size change in automatic slitting system can be done by touch button in HMI. It is to be noted that there is a one common linear transducer for all top (42a) and bottom slitter (44aa). And the position accuracy of the knives is considered +/-0.1 mm. Said slitter knives in automatic operation works through pneumatic functions. These slitter knives (42a) are attached to pneumatic holder that can be adjusted laterally and vertically. Said pneumatic slitter knives (42a) in turn interact with the bottom knives (44aa) to complete the slitting action. Both said bottom (44aa) and top slitter knives (42a) should be positioned to have an overlapping clearance of about 1.6 mm for more effective trimming and slitting functions. A small trim duct (47b) is fitted with the bottom slitter holder (44a) and it also moves along with motorized bottom slitter unit (44a). The center slitting is used when there is more than one cut is produced from the web. If there is only one cut produced from the web, then the top knife (41) holder is moved in upward direction. The trim exhaust duct (47a) is attached together with this slitting system for collection of waste produced by the edge trimming with the help of blower. The method to perform automatic operation comprises of following sequence. Firstly, stop the machine and release the air from the air shaft (47b) of the bottom slitter. Then remove the brake from caliper (416) for top slitter. Now, operate the clamping cylinder (47ba) of the bottom slitter to lock the top slitter holder. After that, the position of each knife is measured through an absolute linear transducer which transfers the data to the PLC, and this are displayed on the HMI. The HMI performs an optimum selection of the knives that must be moved in left or right in order to achieve the programmed sizes with the help of ball screw and nut. The stepping motors are started and move the top (42a) and bottom knives (44aa). Now, apply air in the air shaft (47b) to clamp the bottom slitter and in brake caliper (416) to clamp the top slitter. Then release air from clamping cylinder (47ba) and unlock the top slitter. Now, start the machine.

Continue referring fig. 4(d), in the said slitting unit (13), there is facility to web clamping and dust removal assembly (418) in case of emergency like tearing of paper or defect in paper. A suction blower (not shown) is used to suck the dust from the web and transfer the dust through ducting to their next destination.

Referring fig. 4(e), in the said slitting unit (13), said main pulling roll (42) is designed very preciously and coated with specially tungsten carbide, that pulls the paper from the unwinder reel stand (23) and delivered it to the synchro unit (13) for cross cutting operation. Said main pulling roll (420) is connected with electric motor through timing pulley (417) arrangement. There are two numbers of pneumatic cylinders placed at both end of a grooved rubber roll (419) for engage & disengage of rubber roll with main pulling roll (420).

Now, as shown in fig. 4(f), when the paper comes from the main pulling roller and passes between the top (48) & bottom (49) rotary drum, then the top (413) & bottom (415) rotary knife which are coming in shearing contact with each other, cuts the paper. The concept of digital cutting is that it cut the paper of any size between ranges of 400 mm to 1450 mm in crosscut direction. A helical gear (with zero backlash) train is designed to drive the top (48) & bottom (49) rotary drum with the help of servo motor (410). It is located inside of a gear box housing (411). The enclosed gearbox housing (411) is filled with lubricated gear oil.

Further, to set the top (413) & the bottom (415) rotary knife, the knife back of the top and bottom cutting knife should be completely contact with surface. Then for paper cutting, operator has to follow the knife setting procedure provided in operational manual and training imparted during installation by LOM person.

Now, according to another embodiment of the invention, fig. 5(a) depicts the complete belt conveyor path of the improved air shower assembly of the overlapping unit (14) of the present invention. The overlapping unit (14) comprises a first pulling drive belt (51), a second conveyor belt (52), a third pulling drive belt (53), a guide conveyor belt (54) and a rejection gate provided between the first conveyor (51) & the second conveyor (52). Now, when paper is cut in the synchro cutting unit (13), at the exit, paper is travelling to overlapping unit (14) through first pulling motor drive (51) which is driving first conveyor (51). This first conveyor (51) has a higher speed than line speed and in this way the sheets are spaced one from the other. By the control system, the distance from one sheet to the next can be varied from a minimum of 10% to a maximum of 20% of the format length. In first conveyor (51), some rolls that are support to the belts are mounted on the small movable carriage which is moving on two LM guides. The roll arrangements are such that all the belts remain always in tension condition. The movement of carriage is done by manual lever handle. The main purpose of this adjustment is to facilitate the operator to have access of knives or synchro rotary (413, 415). Now, as shown in fig 5(a), the paper is travelling to the pile unit (15) through various conveyors i.e. first conveyor belt (51), second conveyor belt (52) & third conveyor belts (53), speed of first conveyor (51) and second conveyor (52) are same but third conveyor (53) has lower speed then second conveyor (52) to perform the overlapping of sheet. Due to this reduction in speed of belt, trailing sheet is overlapped on leading sheet. By the control system, the distance from one sheet to the next overlapped sheet can be varied from a minimum of 20% to a maximum of 50% of the format length. The third conveyor (53) is made from polyvinylchloride (PVC) material and the guide conveyor belt (54) is supporting the paper travelling from first conveyor to the third conveyor (53) without disturbing the web.

After receiving signal from the splice detector sensor (36) through PLC, the rejection gate (55) pneumatic cylinder automatically operate & divert the defected or joint paper to the waste collection trolley. There is a provision of selector switch in control box to operate rejection gate (55) pneumatic cylinder (not shown) that also divert the unwanted or defected paper to the waste collection trolley. It is for the manual operation of rejection by operator. Number of rejection sheet at each operation of rejection gate is also controlled by operator through HMI. If there is rejection of maximum 3 sheets per operation, provide guaranteed prevention of reaching waste sheet to pile unit (15). The rejected sheets are falling through incline tray to sheets trolley container.

Further, as shown in fig. 5(b) and 5(c), the overlapping unit (14) with an improved air shower assembly comprises an air blow nozzle (57) mounted between the conveyor belts, an air blower (58) is connected in series of air blow nozzle (57) through a common chamber, an air shower assembly (56) with pneumatic or solenoid valve (59). Said air blow nozzle (57) is configured in such a way that it blows air at the bottom of the leading edge of the sheet to lift the edge. Said air shower assembly (56) is operatively located between the second (52) and the third (53) conveyor. Said pneumatic or solenoid valves (59) are mounted in cross direction of sheet flow. These series of solenoid valves (59) are operated as high frequency to perform on or off function. Said air shower assembly (56) is configured to blow the pressurized air (510) vertically on a trailing edge of leading sheet (512) through the pneumatic valve (59). Thus, the air shower assembly (56) of the overlapping unit (14) has a function of pressing down the trailing edge of sheet. All the solenoid valves (59) are adjustable in transverse direction to set according to sheet format size and number of pockets running in the machine. These solenoid valves (59) create a series of air jet (510) throughout the width of the web to press the trailing edge of sheet. These valves (59) are connected with compressed air line. The pressure of air is adjustable by a regulator as per the application requirement based on GSM of sheets.

After forming sheets by the cross cutting unit (13), the cut size sheets travel towards the overlapping unit (14). Said overlapping unit (14) accumulate the numbers of sheet to form a stack of sheets (pile). When the sheets are travelling through the cross cutting, sheets are spaced by first pulling conveyor (51) and then as the first (leading) sheet (512) crossed the air shower assembly (56), a trailing edge of the leading sheet (512) is forced down by the jet of pressurized air (510). Then after, a leading edge of subsequent (trailing) sheets (511) is raised by blowing air through the air blow nozzle (57). Just after that, sheet passes through the third conveyor (53) which has a lower speed than second conveyor (52). So, the overlapping of sheet is facilitated along with speed difference of the conveyors. When the overlapped sheet reaches the stacking height of sheet, the next pile is made ready to perform continues operation of piling of sheets. This operation is repeated for each sheet in synchronization with machine speed and/or format size.

Moreover, in digital cross cutting unit (13), any size of paper in the specified range can be cut, based on this paper guide assembly adjustment is require on overlapping unit (14). Now, as shown in fig. 6, the pile delivery unit (15) of the paper sheeter system with the auto bottom pallet changing system (17) consists of a group of wedges and a group narrow belt installed on pivoting wheels driven by pneumatic cylinders. A bottom plate (62) is tied to a chain at each four corners of pallet which moves up and down by the mean of main drive (66) according to the sensor detects the stacking height of sheet. An empty pallet (64) is placed at the bottom pallet plate (67) which positioned continuously as per the pile height. The sheets coming from the overlapping unit (14) through exit pulley is stacked on an empty pallet (64). A front side stopper (61) plates are placed after the empty pallet (64) and it is adjustable as per cut length of paper. A back- squaring assembly (65) along with jogger (Eccentric) is fitted before the empty pallet (64). A side squaring plate (63) is fitted on both side of pallet; a pneumatic vibrator is fitted on the side of squaring plate (63) which continuously vibrates to stack pile of paper in a straight line.

Further, the bottom pallet changing assembly (17) consists of two numbers of plates that moves forward and reverse as per the requirement. When a plate (62) is in use at pile delivery, the plate (67) with the empty pallet (64) is ready at other side. The pallets (62) and (67) are interchangeable. A pneumatic operated stopper plate (68) is placed which protect accidental damages in pile.

Moreover, the paper sheeter machine can be supplied optionally with center arm equipped in unwinder to use two narrow web reels at a same time in 1 unwinder. Two reels with same diameter can be loaded. In case of one reel arrangement, centre fork arm need to rest on resting piece. Furthermore, manual lubrication pump is supplied default with the machine while automatic lubrication system can be provided optionally with the machine. Advantage of auto lubrication system is it automatically pumps the oil to the centralized lubrication line connected at each lubrication ports at pre-defined intervals.

The invention has been explained in relation to specific embodiment. It is inferred that the foregoing description is only illustrative of the present invention and it is not intended that the invention be limited or restrictive thereto. Many other specific embodiments of the present invention will be apparent to one skilled in the art from the foregoing disclosure. All substitution, alterations and modification of the present invention which come within the scope of the following claims are to which the present invention is readily susceptible without departing from the spirit of the invention. The scope of the invention should therefore be determined not with reference to the above description but should be determined with reference to appended claims along with full scope of equivalents to which such claims are entitled.

LIST OF REFERENCE NUMERALS

Drive side (1) Bottom slitting holder (44a)

Operating side (2) Magnetic scale (44b)

Unwinder unit (11) Handwheel for size adjustment (45)

De-curling unit (12) Locking handle (46)

Slitting and synchro cutting unit (13) Slitting holder plate assembly (47)

Overlapping unit (14) Trim exhaust duct (47a)

Pile delivery unit (15) Air shaft (47b) and clamping cylinder (47ba)

Main control panel (16) Trim duct (47c)

Pallet changer unit (17) Top rotary drum (48)

Track and trolley system (18) Bottom rotary drum (49)

De-creasing roller assembly (21) Servo motor for rotary drive (410)

Unwinder control panel (22) Gear box housing (411)

Unwinding stand (23) Top rotary knife (413)

Fork arm (24) Bottom rotary knife (415)

Paper reel (25) Caliper brake (416)

Slicing and joining assembly (26) Timing pulley drive for slitting holder (417)

Hydraulic cylinder (27) Web clamping and dust removal assembly (418)

Core chuck (28) Grooved Rubber Roll (419)

Hydraulic power pack (29) Main pulley roll (420)

Electro-pneumatic brakes (210) First conveyor (51)

Web clamp (211) Second conveyor (52)

Paper support sheet (212) Third conveyor (53)

Paper slicing arrangement (213) Guide conveyor (54)

Limit switch for minimum web size (214) Rejection gate (55)

Limit switch for maximum web size (215) Air shower assembly (56)

Proximity sensor (31) Air blow nozzle (57)

Gearbox (32) Air blow (58)

De-curling bar (33) Solenoid valve (59)

De-curling rods (34) Air jet (510)

Edge sensor assembly (35) Trailing Sheet (512)

Splice detector system (36) Leading sheet (513)

Web (37) Front side stopper (61)

Static bar (38) Bottom pallet plate-1 (62)

Pneumatic top knife holder (41) Side squaring plate (63)

Top knife (42) Empty pallet (64)

Top slitting knife (42a) Back squaring plate with jogger (65)

Bottom knife sleeve (43) Main drive for pile up and down (66)

Bottom knife (44) Bottom pallet plate-2 (67)

Bottom knife automatic slitter (44aa) Stopper plate (68)

Claims

I Claim:

1. A paper sheeter machine with improved air shower assembly comprises of an unwinder unit (11), a decurling unit (12) connected to the downstream of the unwinder unit (11), a slitting and synchro cutting unit (13) located at the downstream of the de-curling unit (12), an overlapping unit (14) with an improved air shower assembly fixed after the slitting and synchro cutting unit (13), a pile delivery unit (15) with motorized size changing system located downstream to the overlapping unit (14), an main control panel (16) connected at the drive side (1) of the paper sheeter machine, an auto pallet changer unit (17) connected below to the pile delivery unit (15), and an automatic track & trolley unit (18) located at the operating side (2) is mounted on the ground surface just below to the unwinding unit (11) of the paper sheeter machine; the overlapping unit (14) comprises a air shower assembly (56), a first pulling drive belt (51), a second conveyor belt (52), a third pulling drive belt (53), a guide conveyor belt (54) and a rejection gate (55) provided between the first conveyor (51) & the second conveyor (52); characterized in that, the air shower assembly (56) comprises an air blow nozzle (55) mounted between conveyor belts and is configured to blow air at a bottom of a leading edge of trailing sheets (511), an air blower (58) is connected in series of air blow nozzle (57) through a common chamber, an air shower assembly (56) operatively located between the second (52) and the third (53) conveyor and is configured to blow the pressurized air (510) on a trailing edge of a leading sheet (512) through the pneumatic valve (59) in cross direction of sheet flow.

2. The paper sheeter machine with improved air shower assembly as claimed in claim 1, wherein a splice detector system (36) is located just before the slitting section (13) configured to operate the rejection gate (55) & divert the defected or joint paper to the waste collection trolley.

3. The paper sheeter machine with improved air shower assembly as claimed in claim 1, wherein the air shower assembly (56) comprises a series of solenoid valves (59) which are operated as high frequency to perform on or off function.

4. The paper sheeter machine with improved air shower assembly as claimed in claim 3, wherein the solenoid valves (59) are adjustable in transverse direction to set according to sheet format size and number of pockets running in the machine.

5. The paper sheeter machine with improved air shower assembly as claimed in claim 3, wherein the solenoid valves (59) create a series of air jet (510) throughout the width of the web to press the trailing edge of sheet and are connected with compressed air line.

6. The paper sheeter machine with improved air shower assembly as claimed in claim 5, wherein the pressure of air jet (510) is adjustable by a regulator as per the application requirement based on GSM of sheets.

7. The paper sheeter machine with improved air shower assembly as claimed in claim 1, wherein the air blower (58) is provided for air blow function to lift the front edge of sheets and the air shower assembly (56) is provided for function of pressing down the trailing edge of sheets..

8. The paper sheeter machine with improved air shower assembly as claimed in claim 1, wherein the frequency of the switching operation of air shower (56) and air blow (58) is synchronized with the speed of machine and format size of sheet which is controlled by PLC.

9. A method of the paper sheeter machine with improved air shower assembly comprises following steps: a. travelling of cut size sheet to a overlapping unit (14) through a first conveyor (51); b. reducing a speed of the first conveyor (51) to the third conveyor (53) result in overlapping of cut size sheet; c. creating the air jet (510) through solenoid valve (59) at trailing edge of the leading cut size sheet (512), and blowing air (58) through a air blow nozzle (57) at the leading edge of the trailing cut size sheet (511) resulting in the smooth, uniform and maintenance free operation of overlapping of the sheet.