GB1582325A – Deburring of knife edges
– Google Patents
GB1582325A – Deburring of knife edges
– Google Patents
Deburring of knife edges
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Info
Publication number
GB1582325A
GB1582325A
GB23384/78A
GB2338478A
GB1582325A
GB 1582325 A
GB1582325 A
GB 1582325A
GB 23384/78 A
GB23384/78 A
GB 23384/78A
GB 2338478 A
GB2338478 A
GB 2338478A
GB 1582325 A
GB1582325 A
GB 1582325A
Authority
GB
United Kingdom
Prior art keywords
pawl
knives
knife head
stripping
designed
Prior art date
1977-09-07
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB23384/78A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Skoda op
Skoda np
Original Assignee
Skoda op
Skoda np
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1977-09-07
Filing date
1978-05-26
Publication date
1981-01-07
1978-05-26
Application filed by Skoda op, Skoda np
filed
Critical
Skoda op
1981-01-07
Publication of GB1582325A
publication
Critical
patent/GB1582325A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
A—HUMAN NECESSITIES
A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS’ REQUISITES
A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
A24C5/14—Machines of the continuous-rod type
A24C5/28—Cutting-off the tobacco rod
A24C5/30—Machines combined with devices for grinding the knives
B—PERFORMING OPERATIONS; TRANSPORTING
B24—GRINDING; POLISHING
B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
Description
(54) IMPROVEMENTS RELATING TO
THE DEBURRING OF KNIFE EDGES
(71) We, SKODA, OBOROVY PODNIK of Plzen, Czechoslovakia, a corporation organised and existing under the laws of
the Czechoslovak Socialist Republic, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:– The present invention relates to a device for stripping burrs produced by sharpening cutting edges of knives, particularly knives of cutting-off tools in cigarette making machines. The invention also includes within its scope a cutting machine when provided with such a device.
With hitherto known deburring devices for knives of cigarette cutting-off tools, burrs are not actually stripped from cutting edges but rather ground off by grinding wheels whereby the cutting edge shape gets undesirably deformed and, consequently the cigarette cut quality is impaired.
An object of the invention is to eliminate or at least to mitigate the afore-mentioned drawback of the prior art and to provide a device for deburring cutting edges of knives for cigarette cutting-off tools in cigarette making machines by stripping burrs after sharpening, the device having its drive derived from the rotor of a cutting-off tool head. The burrs are stripped by means of stripping rollers designed for rolling along the knife edge and for returning the burrs produced by sharpening back into the knife edge plane and into the tangential plane of a grinding wheel.
According to the invention, a device for deburring cutting edges of knives, carried by a knife head of a cutting machine, by stripping burrs after sharpening of said knives, wherein the drive of said device is derived from the rotor of the knife head, comprises: stripping rollers integral with respective ratchet wheels and mounted for rotation about respective pins fixed on a shoulder provided on a driven shaft; a pawl arranged in the plane of motion of said ratchet wheels and designed for meshing into teeth of said ratchet wheels; a tension spring fixed at one of its ends to said pawl and fixable at its other end, in use of the device, to the frame of said machine; and a stop fixable on said machine frame and designed for abutting the arm of said pawl.
The number of stripping rollers preferably corresponds to that of knives in the knife head of the cigarette cutting-off tool.
The merit of the device according to the invention can be seen in the arrangement of the stripping rollers which are caused to rotate in counterdirection relative to the knife revolving motion, and into the tangential plane of a grinding wheel, thus establishing favourable conditions for producing a smooth cut while severing individual cigarette rods from a continuous strand.
A preferred embodiment of the device according to the invention will hereinafter be described with reference to the accompanying schematic drawings. In the draw ings Fig. 1 shows a view, partially in section, of a device for e.g. a double-knife head of a cigarette cutting-off tool; and
Fig. 2 is a detailed view of a ratchet-andpawl mechanism at the moment when the knife is moved in the direction of arrow A for being stripped.
As can be seen n both Figs. 1 and 2 of the drawings, the deburring device comprises a pair of stripping rollers 1 which are integral with two respective ratchet wheels 2 and which are mounted to rotate about pins 3. The pins 3 are secured to a shoulder 4 provided at one end portion of a shaft 5. At the opposite end portion of said shaft 5 there is secured a first gear wheel 6 designed for meshing into teeth of a second gear wheel 7 fixed to an end portion of a shaft 8. The opposite end portion of said shaft 8 is provided with a first, pulley 9 coupled via a timing belt 10 with a second pulley 11 secured on a shaft 12 of the rotor of a double-knife head 13. In the plane of movement of the ratchet wheels 2 there is provided a pawl 14 journalled about a pivot 15 fixed to the machine frame.
The pawl 14 is provided at its operative end portion with a claw 16 designed for alternately engaging the teeth of one and the other ratchet wheel 2. In the arm of the pawl 14 there is provided a hole 17 receiving one end portion of a tension spring 18 the other end of which is fixedly attaced to the machine frame. opposite the arm of the pawl 14 a stop 19 is provided designed for abutting said pawl 14.
The afore-described device operates as follows :
Sharpened knives 20 fixedly clamped in the knife head 13 of the cigarette cuttingoff tool (see the copending application No.
12989/77 (Serial No. 1528895) corresponding to the Czechoslovak Application No. 220576) come, during their revolving motion, into engagement with the surfaces of stripping rollers 1 which are positively rotated in counter-direction relative to the movement of knives 20, due to the engagement between the claw 16 of the pawl 14 and the teeth of the ratchet wheels 2. As the cutting edges of the knives 20 slip on the surface of the rotating stripping rollers 1 the desired stripping of the burrs occurs.
WHAT WE CLAIM IS:
17. A device for deburring cutting edges of knives, carried by a knife head of a cutting machine, by stripping burrs after sharpening of said knives, wheren the drive of said device is derived from the rotor of the knife head, the device comprising: stripping rollers integral with respective ratchet wheels and mounted for rotation about respective pins fixed on a shoulder provided on a driven shaft; a pawl arranged in the plane of motion of said ratchet wheels and designed for meshing into teeth of said ratdhet wheels; a tension spring fixed at one of its ends to said pawl and fixable at its other end, in use of the device, to the frame of said machine; and a stop fixable on said machine frame and designed for abutting the arm of said pawl.
2. A device according to Claim 1, wherein the number of said stripping rollers corresponds to the number of the knives of said knife head.
3. A device for deburring cutting edges of knives, said device being constructed, arranged and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in the accompanying drawings.
4. A cutting machine when provided with a device according to any one of the preceding claims.
5. A cigarette cutting-off tool being a cutting machine according to Claim 4.
6. Cigarettes which have been cut by a tool according to Claim 5.
7. A knife head, the knives of which have been deburred by a device according to any one of Claims 1 to 3.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
**WARNING** start of CLMS field may overlap end of DESC **.
a second gear wheel 7 fixed to an end portion of a shaft 8. The opposite end portion of said shaft 8 is provided with a first, pulley 9 coupled via a timing belt 10 with a second pulley 11 secured on a shaft 12 of the rotor of a double-knife head 13. In the plane of movement of the ratchet wheels 2 there is provided a pawl 14 journalled about a pivot 15 fixed to the machine frame.
The pawl 14 is provided at its operative end portion with a claw 16 designed for alternately engaging the teeth of one and the other ratchet wheel 2. In the arm of the pawl 14 there is provided a hole 17 receiving one end portion of a tension spring 18 the other end of which is fixedly attaced to the machine frame. opposite the arm of the pawl 14 a stop 19 is provided designed for abutting said pawl 14.
The afore-described device operates as follows :
Sharpened knives 20 fixedly clamped in the knife head 13 of the cigarette cuttingoff tool (see the copending application No.
12989/77 (Serial No. 1528895) corresponding to the Czechoslovak Application No. 220576) come, during their revolving motion, into engagement with the surfaces of stripping rollers 1 which are positively rotated in counter-direction relative to the movement of knives 20, due to the engagement between the claw 16 of the pawl 14 and the teeth of the ratchet wheels 2. As the cutting edges of the knives 20 slip on the surface of the rotating stripping rollers 1 the desired stripping of the burrs occurs.
WHAT WE CLAIM IS:
17. A device for deburring cutting edges of knives, carried by a knife head of a cutting machine, by stripping burrs after sharpening of said knives, wheren the drive of said device is derived from the rotor of the knife head, the device comprising: stripping rollers integral with respective ratchet wheels and mounted for rotation about respective pins fixed on a shoulder provided on a driven shaft; a pawl arranged in the plane of motion of said ratchet wheels and designed for meshing into teeth of said ratdhet wheels; a tension spring fixed at one of its ends to said pawl and fixable at its other end, in use of the device, to the frame of said machine; and a stop fixable on said machine frame and designed for abutting the arm of said pawl.
2. A device according to Claim 1, wherein the number of said stripping rollers corresponds to the number of the knives of said knife head.
3. A device for deburring cutting edges of knives, said device being constructed, arranged and adapted to operate substantially as hereinbefore described with reference to, and as illustrated in the accompanying drawings.
4. A cutting machine when provided with a device according to any one of the preceding claims.
5. A cigarette cutting-off tool being a cutting machine according to Claim 4.
6. Cigarettes which have been cut by a tool according to Claim 5.
7. A knife head, the knives of which have been deburred by a device according to any one of Claims 1 to 3.
GB23384/78A
1977-09-07
1978-05-26
Deburring of knife edges
Expired
GB1582325A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
CS775833A
CS193284B1
(en)
1977-09-07
1977-09-07
Device for scraping the burr of the knifes of the cigarette cutter following the grinding
Publications (1)
Publication Number
Publication Date
GB1582325A
true
GB1582325A
(en)
1981-01-07
Family
ID=5403976
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB23384/78A
Expired
GB1582325A
(en)
1977-09-07
1978-05-26
Deburring of knife edges
Country Status (4)
Country
Link
CS
(1)
CS193284B1
(en)
DE
(1)
DE2834546A1
(en)
GB
(1)
GB1582325A
(en)
SE
(1)
SE7808131L
(en)
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE494489C
(en)
*
1927-01-11
1930-03-24
Muller J C & Co
Grinding device for sickle knives in strand cigarette machines
DE940699C
(en)
*
1952-12-18
1956-03-22
Kurt Koerber & Co K G
Device for cutting through filter rods for the production of filter mouthpiece cigarettes
GB1503209A
(en)
*
1975-06-14
1978-03-08
Molins Ltd
Sharpener for cut-off having a helical knife
1977
1977-09-07
CS
CS775833A
patent/CS193284B1/en
unknown
1978
1978-05-26
GB
GB23384/78A
patent/GB1582325A/en
not_active
Expired
1978-07-25
SE
SE7808131A
patent/SE7808131L/en
unknown
1978-08-07
DE
DE19782834546
patent/DE2834546A1/en
active
Granted
Also Published As
Publication number
Publication date
DE2834546C2
(en)
1989-08-03
SE7808131L
(en)
1979-03-08
CS193284B1
(en)
1979-10-31
DE2834546A1
(en)
1979-03-08
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Legal Events
Date
Code
Title
Description
1981-03-25
PS
Patent sealed
1991-01-23
PCNP
Patent ceased through non-payment of renewal fee
