US3732766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet trimming machines
Assignee: McCain Manufacturing Corp
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Filing: 1971-02-16
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Granted: 1973-05-15
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Expires: 1991-02-16
Abstract
Abstract A three-knife sheet trimmer is so constructed as to separate the drive for the knives (one front knife and two side knives) from the drive for the clamps which hold the sheets (e.g. the sheets of a book) stationary while being trimmed. The knives at the stations are operated out of phase, and the moving masses are therefore balanced compared to the previous form of these trimmers where all knives move in the same direction at the same time. Separating the drives also enables a book to be sooner advanced from the first knife station to the second knife station. This being so, there is a greater allowance of time in which to make the transfer, and hence there is no need to rush the book. The stops at the several knife stations against which a book is advanced may be adjusted simultaneously, and the separate feed means which advance or feed the books first from the first knife station to the second knife station and then out of the second knife station, may be opened or spread apart simultaneously either for re-adjustment to accommodate books of a different size or for the purpose of clearing a jam.
Inventors
- 👤 W Mccain
- 👤 J Cosgrove
- 👤 E Bewersdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
B; B26; B26D; B26D11/00; B26D7/00; B26D7/06; B26D7/0625; B26D7/0675; B26D2007/0012; B26D2007/0081; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2074; Y10T83/2081; Y10T83/2092; Y10T83/2198; Y10T83/444; Y10T83/461; Y10T83/463; Y10T83/4645; Y10T83/566; Y10T83/5669; Y10T83/647; Y10T83/6476; Y10T83/748; Y10T83/7593; Y10T83/7647; Y10T83/808; Y10T83/811; Y10T83/825; Y10T83/869; Y10T83/8821; Y10T83/8828; Y10T83/8837; Y10T83/8838
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
In a cyclically operable machine for trimming stacked sheets such as signatures or the like fed through the machine in sets of stacks one after another: a vertically operable knife at a first knife trimming station for trimming the sheets in a stack along one edge and a vertically operable knife at a second knife trimming station for trimming the sheets of the same stack along a second edge, feed means to feed a stack first to one knife station for trimming and then to the other knife station for trimming, each knife having a head guided for vertical movement, knife drive means connected to the head of one knife and operable to impart reciprocal motion thereto in a downward cutting stroke and an upward return stroke in a single cycle of the machine, and means joining the heads of the knives and configured to translate reciprocal motion of the driven knife head into motion of the other knife head in the opposite direction within the same machine cycle.
Claim 2
Dependent Claim
169 words
In a cyclically operable machine for trimming stacked sheets such as signatures or the like fed through the machine in sets of stacks one after another: a vertically operable knife at a first knife trimming station for trimming the sheets in a stack along one edge and a vertically operable knife at a second knife trimming station for trimming the sheets of the same stack along a second edge, feed means to feed a stack first to one knife station for trimming and then to the other knife station for trimming, each knife having a head guided for vertical movement, knife drive means connected to the head of one knife and operable to impart reciprocal motion thereto in a downward cutting stroke and an upward return stroke in a single cycle of the machine, and means joining the heads of the knives and configured to translate reciprocal motion of the driven knife head into motion of the other knife head in the opposite direction within the same machine cycle.
Claim 3
Dependent Claim
100 words
A machine according to claim 1 in which there are two knives each with a head at the second trimming station for trimming parallel side edges of the sheets, the means joining the heads of the knives of the two stations including a pair of rock shafts each having an operating arm at one end joined to the head of the knife at the first station whereby reciprocation thereof oscillates the rock shafts in unison, and each rock shaft at the opposite end being linked respectively to a knife head at the second trimming station to impart concurrent motion thereto.
Claim 4
Dependent Claim
77 words
A machine according to claim 1 provided with a set of vertically movable clamps operable independently at each trimming station to clamp the stack being trimmed, drive means for operating one set of clamps, and means joining the driven set of clamps to the other set of clamps and configured to translate vertical motion of the driven set of clamps into motion of the other set of clamps in the opposite direction during the same machine cycle.
Claim 5
Dependent Claim
99 words
A machine according to claim 3 wherein there are two knives each with a head at the second trimming station for trimming parallel side edges of the sheets, the means joining the heads of the knives of the two stations including a pair of rock shafts each having an operating arm at one end joined to the head of the knife at the first station whereby reciprocation thereof oscillates the rock shafts in unison, and each rock shaft at the opposite end being linked respectively to a knife head at the second trimming station to impart concurrent motion thereto.
Claim 6
Dependent Claim
39 words
A machine according to claim 3 wherein the clamp drive means is a reciprocable cross head, the means joining the clamps including rock shafts operated by said cross head and operating links joining the rock shafts and the clamps.
Claim 7
Dependent Claim
99 words
A machine according to claim 5 wherein there are two knives each with a head at the second trimming station for trimming parallel side edges of the sheets, the means joining the heads of the knives of the two stations including a pair of rock shafts each having an operating arm at one end joined to the head of the knife at the first station whereby reciprocation thereof oscillates the rock shafts in unison, and each work shaft at the opposite end being lInked respectively to a knife head at the second trimming station to impart concurrent motion thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |