Automatic paper cutting machine using Geneva mechanism

Automatic paper cutting machine using Geneva mechanism

The design of paper cutting machine using Geneva mechanism is very useful to cut papers in equal and accurate dimensions. Geneva drive is an indexing mechanism that converts the continuous motion into intermittent motion. Due to the intermittent motion, the paper is moved between the time intervals of cutting periods. Then the paper cutting is achieved by the crank and lever mechanism. The cutter will be back to its original position by the spring effect.

This machine is also used to cut the various kind of paper products, plastic, thin film, leather, slice of nonferrous metal etc. This system can be applicable in paper cutting industry and proves how it can be a low cost solution in the production practiceSee also:Paper Cutting And Rewinding Machine Mechanical Project

INTRODUCTION

Traditional hand lever cutting machine has drawbacks viz. it doesn’t provide safety to operator. It is not user friendly as every time user has to adjust the paper to desired cut position and hold the paper before taking cut. It is very time consuming and tedious process to take a job with different cut size so such machine also accuracy job taken on this machine depends on operators skills.

To overcome problems automatic paper cutting machine is designed, in order to reduce the time for marking and cutting the papers.
Geneva mechanism is commonly used indexing mechanism where an intermittent motion is required.

The conventional Geneva mechanism is generally simple and inexpensive. Because there is no special curved profile on any of the components except straight lines and circular arcs.

The paper cutting is done by crank and lever mechanism. After cutting, the spring connected to the cutter will bring the cutter back to its original position.

The main purpose of this machine is to reduce time for marking the papers. Hence, this machine is working fully based on timing. It has got wide application area in books or notebook manufacturing industry, visiting cards or labels manufacturing industry etc.

See Also: Design and Fabrication of a Manually Operated Paper Recycling Machine | Mechanical Project

• GENEVA WHEEL:In our Geneva, the driven wheel has four slots and thus advances by one step of 90 degrees for each rotation of the drive wheel. Hence the intermittent motion is achieved for 1/4 of the 360 degrees.
• SPROCKETS:A sprocket or sprocket-wheel is a profiled wheel with teeth, cogs, or even sprockets that mesh with a chain. The sprockets are used for the power transmission between two shafts through the roller chain.
• ROLLER CHAIN: Roller chain is the type of chain drive most commonly used for transmission of mechanical power between two sprockets. It consists of a series of short cylindrical rollers held together by side links. It is driven by a toothed wheel called a sprocket.
• PAPER CUTTER: A paper cutter is a tool, designed to cut the paper with a straight edge. Paper cutters vary in size. This paper cutter is used as the oscillator in the four bar crank and lever mechanism.
• COIL SPRING: A coil spring, also known as a helical spring, is a mechanical element, which is typically used to store energy and subsequently release it. This coil spring is used to bring the cutter to its original position.
• SHAFT:A shaft is a rotating machine element which is used to transmit power from one place to another. This shaft form an integral part of the machine itself. The crank shaft is an example of machine shaft.
• PAPER ROLLER: Paper roller is an element which is used to roll the paper while the intermittent motion. The paper roller is used to feed the paper without any damage.

1.When the cam pin is in extreme right position i.e. engage position, the crank shaft will be at extreme bottom position. Hence the cutter is in full open position and the spring will be in rest position.

2.When the cam pin is in extreme bottom position i.e. disengage position, the crank shaft will be at extreme left position. Hence the cutter is in partial cutting position and the spring will be in partial tension.

3.When the cam pin is in extreme left position i.e. disengage position, the crank shaft will be at extreme top position. Hence the cutter is in full cutting position and spring will be in full tension. 4.When the cam pin is in extreme top position i.e. disengage position, the crank shaft will be at extreme right position. Hence the cutter is in partial cutting position and the spring will be in partial tension. Thus the paper cutting is achieved by the above four process of the Geneva and cutter.