Patent US3733951A successfully refreshed from Google Patents.
US3733951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet cutting apparatus
Assignee: Ricoh Co Ltd
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Filing: 1971-04-27
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Granted: 1973-05-22
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Expires: 1991-04-27
Abstract
Abstract A cutter receptor extends transversely across the path of movement of sheet material to be cut, and an endless belt is trained over a pair pulleys for movement adjacent and substantially parallel to the cutter receptor. A disk-shaped cutter is rotatably mounted on the endless belt and spring biased to press toward the cutter receptor to cut cut a predetermined length of sheet material during movement of the belt. One pulley is driven by a driving mechanism which is under the control of a control mechanism selectively operable to activate the drive mechanism to rotate the pulley to advance the cutter from a retracted starting position into rotating engagement with the cutter receptor and therealong to cut a length of sheet material, after which the rotation of the pulley is continued to return the cutter to its retracted starting position. In one embodiment of the invention, the driven pulley is fixed to a shaft on which there is rotatably mounted a gear. A coil spring has one end secured to the shaft and its other end secured to a housing rotatable with the gear, and a driving pinion meshes with the gear. The driven pulley is normally latched against movement but, when the latch is released, the spring rotates the driven pulley to drive the belt carrying the cutter. During the time that the pulley is latched against movement, the pinion rotates the gear to rewind the spring. Control elements are associated with the shaft and with the gear, and effect operation of a microswitch controlling energization of a motor for driving the pinion. In another embodiment of the invention, the driven pulley is rotated by an electric motor whose energization is controlled by control cams operatively associated with control switches.
Inventors
- 👤 S Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:13
CPC Classifications
D; D06; D06H; D06H7/00; D06H7/02; B; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/14; B26D1/20; B26D1/205; Y; Y10; Y10T; Y10T83/00; Y10T83/768; Y10T83/7755; Y10T83/7759; Y10T83/7763; Y10T83/7776; Y10T83/869; Y10T83/8776; Y10T83/8782; Y10T83/8784; Y10T83/8821; Y10T83/8822
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
Sheet cutting apparatus comprising, in combination, a cutter receptor extending transversely across a path of movement of sheet material to be cut; an endless belt mounted for movement adjacent and substantially parallel to said cutter receptor; a disk-shaped cutter rotatably mounted on said endless belt for pressing engagement with said cutter receptor to cooperate with the latter to cut a predetermined length of the sheet material during movement of said endless belt in only one direction; a pair of pulleys mounting said endless belt; unidirectional drive mechanism operable to rotate one of said pulleys to drive said endless belt in one direction only; and control mechanism for said drive mechanism selectively operable to activate said drive mechanism to rotate said one pulley to drive said endless belt to advance said cutter, along one run of said chain, from a retracted starting position into rotating engagement with and along said cutter receptor to cut a predetermined length of sheet material and then to return said cutter along the other run of said chain, while said cutter is retracted from said cutter receptor to its retracted position.
Claim 2
Dependent Claim
185 words
Sheet cutting apparatus comprising, in combination, a cutter receptor extending transversely across a path of movement of sheet material to be cut; an endless belt mounted for movement adjacent and substantially parallel to said cutter receptor; a disk-shaped cutter rotatably mounted on said endless belt for pressing engagement with said cutter receptor to cooperate with the latter to cut a predetermined length of the sheet material during movement of said endless belt in only one direction; a pair of pulleys mounting said endless belt; unidirectional drive mechanism operable to rotate one of said pulleys to drive said endless belt in one direction only; and control mechanism for said drive mechanism selectively operable to activate said drive mechanism to rotate said one pulley to drive said endless belt to advance said cutter, along one run of said chain, from a retracted starting position into rotating engagement with and along said cutter receptor to cut a predetermined length of sheet material and then to return said cutter along the other run of said chain, while said cutter is retracted from said cutter receptor to its retracted position.
Claim 3
Dependent Claim
255 words
Sheet cutting apparatus comprising, in combination, a cutter receptor extending transversely across a path of movement of sheet material to be cut; an endless belt mounted for movement adjacent and substantially parallel to said cutter receptor; a disk-shaped cutter rotatably mounted on said endless belt for pressing engagement with said cutter receptor to cooperate with the latter to cut a predetermined length of the sheet material during movement of said endless belt in only one direction; a pair of pulleys mounting said endless belt; drive mechanism operable to rotate one of said pulleys to drive said endless belt in one direction only; control mechanism for said drive mechanism selectively operable to activate said drive mechanism to rotate said one pulley to drive said endless belt to advance said cutter from a retracted starting position into rotating engagement with and along said cutter receptor to cut a predetermined length of sheet material and then to return said cutter to its retracted starting position; said drive mechanism comprising a spiral spring having one end connected to said one pulley; a gear rotatable coaxially relative to said one pulley and having the opposite end of said spiral spring connected thereto; means selectively operable to lock said one pulley against rotation; and a motor driven pinion engaged with said gear to rotate said gear in a spring winding direction when said one pulley is locked against rotation; said control mechanism including a switch operable to energize a motor to rotate said motor-driven pinion to effect rewinding of said spring.
Claim 4
Dependent Claim
255 words
Sheet cutting apparatus comprising, in combination, a cutter receptor extending transversely across a path of movement of sheet material to be cut; an endless belt mounted for movement adjacent and substantially parallel to said cutter receptor; a disk-shaped cutter rotatably mounted on said endless belt for pressing engagement with said cutter receptor to cooperate with the latter to cut a predetermined length of the sheet material during movement of said endless belt in only one direction; a pair of pulleys mounting said endless belt; drive mechanism operable to rotate one of said pulleys to drive said endless belt in one direction only; control mechanism for said drive mechanism selectively operable to activate said drive mechanism to rotate said one pulley to drive said endless belt to advance said cutter from a retracted starting position into rotating engagement with and along said cutter receptor to cut a predetermined length of sheet material and then to return said cutter to its retracted starting position; said drive mechanism comprising a spiral spring having one end connected to said one pulley; a gear rotatable coaxially relative to said one pulley and having the opposite end of said spiral spring connected thereto; means selectively operable to lock said one pulley against rotation; and a motor driven pinion engaged with said gear to rotate said gear in a spring winding direction when said one pulley is locked against rotation; said control mechanism including a switch operable to energize a motor to rotate said motor-driven pinion to effect rewinding of said spring.
Claim 5
Dependent Claim
113 words
Sheet cutting apparatus, as claimed in claim 2, including a shaft having said one pulley fixed thereon and rotatably mounting said gear; said spiral spring having one end secured to said shaft and its other end secured to said gear; said control mechanism including a first rotary control member operable, responsive to release of said one pulley for rotation by said spring, to actuate said switch; and a second rotary control member movable in slaved relation with said one pulley while the latter rotates through a predetermined number of revolutions responsive to unwinding of said spiral spring; said second control member engaging and rotating said first control member to perform a control operation.
Claim 6
Dependent Claim
110 words
Sheet cutting apparatus, as claimed in claim 3, in which said first control member is rotatably mounted on said shaft in engagement with an end surface of said gear; said second control member being secured to said shaft for rotation therewith; an abutment on said one end surface of said gear; said first control member including first and second diametrically opposite wings, said first wing being arranged to engage said abutment to rotate said gear along with said first control member, and said second wing being offset to clear said abutment; said second control member comprising a radially extending wing engageable with said second wing of said first control member.
Claim 7
Dependent Claim
88 words
Sheet cutting apparatus, as claimed in claim 4, including a switch presser pivotally mounted on said one end surface of said gear adjacent the periphery of said gear and biased radially inwardly; said switch being mounted adjacent the periphery of said gear and having a switch actuator engageable by said switch presser upon radially outward movement of said switch presser; said first wing of said first control member being engageable with said switch presser to move the same outwardly to engage said switch actuator to operate said switch.
Claim 8
Dependent Claim
31 words
Sheet cutting apparatus, as claimed to claim 5, including pawl means engageable with said gear to provide for rotation thereof in one direction only while blocking reverse rotation of said gear.
Claim 9
Dependent Claim
77 words
Sheet cutting apparatus, as claimed in claim 1, in which said control mechanism comprises a control lever operable to lock said one pulley against rotation; an electromagnet cooperable with said control lever; a switch controlling energization of said electromagnet; and a cam operable to cLose said switch during the time the sheet material is being cut to energize said magnet to release said control lever from said one pulley to provide for rotation of said one pulley.
Claim 10
Dependent Claim
53 words
Sheet cutting apparatus, as claimed in claim 7, in which said lever is a two-arm lever pivoted intermediate its ends; a stop secured to said one pulley; one arm of said lever being positioned against said stop when said electromagnet is deenergized; the other arm of said lever being cooperable with said electromagnet.
Claim 11
Dependent Claim
128 words
Sheet cutting apparatus, as claimed in claim 1, in which said control mechanism comprises a control lever operable to lock said one pulley against rotation; an electromagnet cooperable with said control lever; a switch controlling energization of said electromagnet; a cam operable temporarily to close said switch to energize said electromagnet; and circuit means operatively associated with said control lever and maintaining said electromagnet energized, after opening of said switch, to release said control lever from said one pulley during the time the sheet material is being cut; said circuit means effecting deenergization of said electromagnet responsive to said disk-shaped cutter being returned to a position near its starting position, to position said control lever to lock said one pulley when said disk-shaped cutter attains its starting position.
Claim 12
Dependent Claim
91 words
Sheet cutting apparatus, as claimed in claim 6, in which said pawl means comprises a pivoted pawl engageable with ratchet teeth of said gear; contact arm means secured to said pawl and frictionally engaged with said gear; said contact arm means, upon rotation of said gear in said one direction, pivoting said pawl away from said gear; and a stop limiting such pivoting of said pawl; said contact arm means, upon attempted rotation of said gear in the opposite direction, pivoting said pawl to reengage the ratchet teeth of said gear.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |