GB2056252A

GB2056252A - Cutting guides

Info

Publication number: GB2056252A
Application number: GB7928685A
Authority: GB
Original assignee: Decoufle SARL
Current assignee: Decoufle SARL
Priority date: 1979-08-17
Filing date: 1979-08-17
Publication date: 1981-03-18
Also published as: GB2056252B

Abstract

A cutter guide drive mechanism for a cigarette-making machine is of the kind wherein a cutter guide member is kept constantly parallel to itself while being rotatable driven at a tangential velocity equal to the linear velocity of a continuous tobacco rod. The remainder of the drive mechanism is housed in an oil-tight casing constituting one of the component elements of the cutter guide drive, whereby the mechanism is efficiently protected and can also be properly lubricated from inside. <IMAGE>

Description

SPECIFICATION Cutter guide drive for cigarette making machine This invention relates to mechanism for driving the cutter guide member of a machine for manufacturing continuous cigarette rods, for example cigarette-making machines of the type disclosed in United Kingdom Patent Specification No. 1,309,507.

The cutter guide drive is of the kind wherein the cutter guide member is carried on a shaft of a yoke having two bearings, each said bearing being mounted on the crankpin of a respective one of a pair of balanced cranks having the same throw, said shaft having its axis at the apex of an isosceles triangle of which the other two corners are coincident with the respective axes of the two bearings, said shaft forming the crankpin of a third crank having the same throw as said pair of cranks, said third crank being driven in rotation, whereby when in operation the cutter guide member moves in a plane parallel to itself at right angles to a continuous cigarette rod.

The object of the invention is to provide a cutter guide drive which assures an improved protection and more efficient lubrication of its component elements.

According to the present invention, a cutter guide drive of the kind set forth hereinabove is characterised in that one of the elements thereof is an oil-tight casing enclosing the remainder of the elements thereof.

In a preferred construction, the third crank consists of a rotary hollow body of which a front portion is shaped to constitute a bearing for said shaft having the cutter guide member secured to its front or outer end. A rear portion of this hollow body constitutes another bearing enabling the body to revolve about a fixed shaft supporting the complete mechanism. The front end of this shaft has pivotally mounted thereon, within said hollow body, the first pair of cranks plates having their crankpins engaged in the first pair of bearings of the coupling yoke. The two bearings of the third crank are off-set vertically from each other by a height equal to the radius of the three crankpins.

Reference will now be made to the accompanying drawing illustrating diagrammatically and by way of example an embodiment of the invention.

In the drawing: Fig. 1 is a longitudinal section taken on the line I-I of Fig. 2; Fig. 2 is a cross section taken along the line 11-Il of Fig. 1; Figs. 3 and 4 are view similar to Fig. 2 showing the component elements in different angular positions set off symmetrically in relation to the position shown in Fig. 2.

The cutter guide mechanism illustrated comprises an oil-tight casing 2 enclosing the remainder of the mechanism; this mechanism is adapted to be driven by a driving pinion 8 for rotation about the fixed shaft 7, the driving pinion 8 being enclosed in a fixed casing 27 of which the front portion is apertured to permit the rotation therein of the rear portion of casing 2, with the interposition of an annular seal 28; for this purpose, a bearing 29 provided in the rear portion of the casing 2 permits the mounting of the casing 2 on said shaft 7.

At its front end, the shaft 7 has secured thereto, inside the casing 2, a member 30 provided with a symmetrical pair of bearings in which are carried shafts 5, 6 of a pair of balanced cranks 3, 4, adapted to oscillate about their respective shafts.

Crankpins 10, 11 of these cranks having the same throw "E", are journalled in symmetrical bearings of a common yoke 12.

The yoke 12 is secured on a shaft 9 the axis of which is at the apex of an isosceles triangle the other two corners of which are coincident with the respective axes of the two bearings. The shaft 9 is in a bearing of the casing 2 which is offset from the axis of the shaft 7 by an amount equal to the throw "E" of the crankpins 10 and 11. Shaft 9 has secured to its end a cutter guide member 14 which projects from the rotary casing 2.

The casing 2 is driven in rotation about the shaft 7 at a speed such that the tangential speed of shaft 9 is equal to the linear velocity of the continuous tobacco rod 16, and the cutter guide member 14 remains constantly parallel to itself, like the shaft 9 to the end of which it is secured, and like the yoke 12 caused to oscillate by the action of the pair of crankpins 10 and 11 remaining constantly parallel to themselves during the exertion of identical torques from the pair of balanced cranks 3 and 4 about their shafts 5 and 6 having a fixed position in the fixed member 30.

The complete mechanism is enclosed in the casing 2 so that it is safely protected while affording a reliable lubrication thereof.

The specific embodiment of the invention which is described hereinabove with reference to the accompanying drawing should not be construed as limiting the present invention, and various modifications may be brought thereto without departing from the scope of the appended

claims.

CLAIMS 1. A cutter guide drive, for a cigarette-making machine, of the kind wherein the cutter guide member is carried on a shaft of a yoke having two bearings, each said bearing being mounted on the crankpin of a respective one of a pair of balanced cranks having the same throw, said shaft having its axis at the apex of an isosceles triangle of which the other two corners are coincident with the respective axes of the two bearings, said shaft forming the crankpin of a third crank having the same throw as said pair of cranks, said third crank being driven in rotation, whereby when in operation the cutter guide member moves in a piane parallel to itself at right angles to a continuous cigarette rod, said drive being characterised in that one of the elements thereof is an oil-tight casing enclosing the remainder of

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Cutter guide drive for cigarette making machine This invention relates to mechanism for driving the cutter guide member of a machine for manufacturing continuous cigarette rods, for example cigarette-making machines of the type disclosed in United Kingdom Patent Specification No. 1,309,507. The cutter guide drive is of the kind wherein the cutter guide member is carried on a shaft of a yoke having two bearings, each said bearing being mounted on the crankpin of a respective one of a pair of balanced cranks having the same throw, said shaft having its axis at the apex of an isosceles triangle of which the other two corners are coincident with the respective axes of the two bearings, said shaft forming the crankpin of a third crank having the same throw as said pair of cranks, said third crank being driven in rotation, whereby when in operation the cutter guide member moves in a plane parallel to itself at right angles to a continuous cigarette rod. The object of the invention is to provide a cutter guide drive which assures an improved protection and more efficient lubrication of its component elements. According to the present invention, a cutter guide drive of the kind set forth hereinabove is characterised in that one of the elements thereof is an oil-tight casing enclosing the remainder of the elements thereof. In a preferred construction, the third crank consists of a rotary hollow body of which a front portion is shaped to constitute a bearing for said shaft having the cutter guide member secured to its front or outer end. A rear portion of this hollow body constitutes another bearing enabling the body to revolve about a fixed shaft supporting the complete mechanism. The front end of this shaft has pivotally mounted thereon, within said hollow body, the first pair of cranks plates having their crankpins engaged in the first pair of bearings of the coupling yoke. The two bearings of the third crank are off-set vertically from each other by a height equal to the radius of the three crankpins. Reference will now be made to the accompanying drawing illustrating diagrammatically and by way of example an embodiment of the invention. In the drawing: Fig. 1 is a longitudinal section taken on the line I-I of Fig. 2; Fig. 2 is a cross section taken along the line 11-Il of Fig. 1; Figs. 3 and 4 are view similar to Fig. 2 showing the component elements in different angular positions set off symmetrically in relation to the position shown in Fig. 2. The cutter guide mechanism illustrated comprises an oil-tight casing 2 enclosing the remainder of the mechanism; this mechanism is adapted to be driven by a driving pinion 8 for rotation about the fixed shaft 7, the driving pinion 8 being enclosed in a fixed casing 27 of which the front portion is apertured to permit the rotation therein of the rear portion of casing 2, with the interposition of an annular seal 28; for this purpose, a bearing 29 provided in the rear portion of the casing 2 permits the mounting of the casing 2 on said shaft 7. At its front end, the shaft 7 has secured thereto, inside the casing 2, a member 30 provided with a symmetrical pair of bearings in which are carried shafts 5, 6 of a pair of balanced cranks 3, 4, adapted to oscillate about their respective shafts. Crankpins 10, 11 of these cranks having the same throw "E", are journalled in symmetrical bearings of a common yoke 12. The yoke 12 is secured on a shaft 9 the axis of which is at the apex of an isosceles triangle the other two corners of which are coincident with the respective axes of the two bearings. The shaft 9 is in a bearing of the casing 2 which is offset from the axis of the shaft 7 by an amount equal to the throw "E" of the crankpins 10 and 11. Shaft 9 has secured to its end a cutter guide member 14 which projects from the rotary casing 2. The casing 2 is driven in rotation about the shaft 7 at a speed such that the tangential speed of shaft 9 is equal to the linear velocity of the continuous tobacco rod 16, and the cutter guide member 14 remains constantly parallel to itself, like the shaft 9 to the end of which it is secured, and like the yoke 12 caused to oscillate by the action of the pair of crankpins 10 and 11 remaining constantly parallel to themselves during the exertion of identical torques from the pair of balanced cranks 3 and 4 about their shafts 5 and 6 having a fixed position in the fixed member 30. The complete mechanism is enclosed in the casing 2 so that it is safely protected while affording a reliable lubrication thereof. The specific embodiment of the invention which is described hereinabove with reference to the accompanying drawing should not be construed as limiting the present invention, and various modifications may be brought thereto without departing from the scope of the appended claims. CLAIMS

1. A cutter guide drive, for a cigarette-making machine, of the kind wherein the cutter guide member is carried on a shaft of a yoke having two bearings, each said bearing being mounted on the crankpin of a respective one of a pair of balanced cranks having the same throw, said shaft having its axis at the apex of an isosceles triangle of which the other two corners are coincident with the respective axes of the two bearings, said shaft forming the crankpin of a third crank having the same throw as said pair of cranks, said third crank being driven in rotation, whereby when in operation the cutter guide member moves in a piane parallel to itself at right angles to a continuous cigarette rod, said drive being characterised in that one of the elements thereof is an oil-tight casing enclosing the remainder of the elements thereof.

2. A cutter guide drive, as claimed in claim 1, wherein the casing is adapted to be driven in rotation about a fixed shaft by a driving pinion enclosed in a second fixed casing of which a face is apertured to receive the rotary casing with the interposition of a seal, a bearing being provided in the rotary casing for mounting the rotary casing on said fixed shaft.

3. A cutter guide drive, as claimed in claim 2, wherein a member having a symmetrical pair of bearings is secured to an end of said fixed shaft within the said rotary casing, said bearings each receiving a respective shaft of one of said balanced cranks, the crankpins of said cranks having the same throw and being engaged in the bearings of said yoke.

4. A cutter guide drive, as claimed in claim 3, wherein the yoke comprises a shaft the axis of which is at the apex of an isosceles triangle of which the other two corners coincide with the axis of the two bearings, said shaft being the crankpin of a third crank having the same throw as the aforesaid cranks, said shaft having secured to its end the cutter guide drive member, projecting from said rotary casing.

5. A cutter guide drive, as claimed in claim 4, wherein the throw, in the rotary casing, of the third crank in relation to the axis of the fixed shaft, is equal to the throw of the other two cranks.

6. A cutter guide drive substantially as described herein with reference to the accompanying drawings.