US968014A

US968014A - Paper-trimming machine.

Info

Publication number: US968014A
Authority: US
Inventors: Samuel K White
Original assignee: Smyth Manufacturing Co
Current assignee: Smyth Manufacturing Co
Priority date: 1904-09-17
Filing date: 1904-09-17
Publication date: 1910-08-23
Anticipated expiration: 1927-08-23

Description

S. K. WHITE.'

PAPER TRIMMING MACHINE.

APPLIOATION FILED SEPT. 17, 1904.

I' 968,014. Patented Aug.23,1910.

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S. K. WHITE.

PAPER TRIMMING MACHINE.

APPLIoATIoN FILED SEPT. 17, 1904.

Patented Aug. 23, 1910.

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S. K. WHITE.

PAPER TRIMMING MACHINE.

v lAPPLIUA'HON FILED SEPT. 17, 1904.

Patented Aug. 23, 1910.

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UNITED sTATEs PATENT oEEioE.

SAMUEL K. WHITE, OF HARTFORD, CONNECTICUT',v ASSIGNOR TO SMYTI-I MANUFACTUR- INGr COMPANY, A. CORPORATION 0F CONNECTICUT.

PAPE-R-TRIMMING MACHINE.

To all 'whom 'it may concern:

Be it known that I, SAMUEL K. WHITE, a citizen of the United States, and a resident of I-Iartford, Connecticut, have invented certain new and useful Improvements in Paper-Trimming Machines, of which the following` is a specification.

My invention relates to machines for cutting paper or similar material, and it is especially useful when applied to a machine for trimming books or generally for trimming paper in the forni of a pile or collection of sheets.

The machines of the character referred to in common use are so constructed that each pile of books or similar pile of sheets when cutor trimmed must be removed and a new pile carefully and accurately located under the trimming knives' by hand. These machines are more or less dangerous to operate and they are slow, it being necessary to stop them to remove the trimmed piles and replace the same with the piles to be trimmed. In all practical paper-cutting machines moreover, the pile of paper or the part of it acted upon by the cutters is supported upon a piece of material, usually` wood, in which the cutters embed themselves after passing through the paper. These cutting beds must be accurately constructed and adjusted with relation to the cutters, and they must be frequently renewed. They are therefore a constant source of trouble and expense, especially where paper is cut in intersecting planes, as for example,where trimming the adjacentsides of a pile of books.

My invention has for an object to provide a paper-cutting machine which may be operated rapidly and without interruption; also to provide a machine which may be operated without special care or skill and without danger to the operator; also to provide a machine in which the troublesome and expensive cutting bed heretofore universally used is dispensed with; and also to provide a machine which is simple and inexpensive in construction and which occupies a minimum space in relation to its working capacity. These and other objects of the in vention will more fully appear `from the following description.

Specification of Letters Patent.

Application filed September 17, 1904.

Patented Aug. 23,' 1910.

serial No. 224,776.

In accordance with one feature of my invention the cutting or trimming operation is performed upon a practically continuous pile or collection of sheets, the untrimmed sheets being progressively added to the pile in advance of the cutting mechanism and the trimmed sheets being removed from the pile at the rear of the cutting mechanism, and 4I regard lthis method of cutting or trimming paper as a part of my invention.

My invention further consists in the novel parts, improvements, and combinations herein described and shown.

In order that my invention may be more fully understood I have illustrated in the accompanying drawings, which are referred to herein and form a part hereof, one embodiment of the invention as applied to a machine for trimming books, the same serving to illustrate by way of example the principles of the invention.

Of t-he drawings, Figure l is a longitudinal central section of a book trimming machine constructed in accordance with my invention; Fig. 2 is a plan view of the same; Fig. 3 is a transverse section taken on substantially line A B of Fig. 2; and Fig. 4 is a longitudinal sectional detail taken on the line C D of Fig. 3; and Fig. 5 is a sectional view of a modification of one feature of the machine herein shown and described.

Referring to the specific embodiment of the invention illustrated by way of example in the drawings, the operative par'ts of the machine are mounted upon a frame consisting of the side members l and 2, which are connected at suitable intervals by the cross girders 8, 4, 5, and 6. Means are provided for supporting and advancing the pile of sheets to be trimmed. These means may be widely varied in construction and arrangement but in the construction sho-wn there is provided a support on which the pile rests and there is also provided means for advancing the pile along the support to be acted upon by the cutting mechanism to be hereinafter described. In the preferred construction the support will be so arranged that the gravity of the sheets will tend to aline the sheets in the pile and preferably, furthermore, and as shown the support will operate on two sides of the pile so as to assist in properly and readily positioning the pile to be acted upon by the trimming mechanism. InV the 'specific construction illustrated the pile of sheets or books is supported by a trough-shaped member 7, which supports the pile ofsheets vwith the sheets resting with part of their weight at least on two adjacent edges, said edges being inclined with relation to the horizontal plane, as

clearly `indicated in Fig. 3.

Any suitable trimming mechanism may be employed and the same may be arranged to trim one or more sides ofthe pile as desired. In the machine shown in the drawing the trimming mechanism consists of a plurality of cutting knives, each arranged to trim one side of the pile. As shown, a knife 8 is provided tov trim the upper right-hand edge of the pile, as viewed in Fig. 3, and a pair of knives 9 and 10 are provided for trimming the upper left-hand side of the pile and the lower right-hand side, as viewed in Fig. 3. Knives 8, 9, and 10 are respectively mounted on

knife bars

11, 12, and 13, which in accordance with the construction shown, are each mounted to reciprocate in the direction of their length in

guide frames

14, 15, and 16, respectively.

In the embodiment of the invention shown means are provided whereby a variation may be effected between the path of the pile and the plane or planes in which t-he trimmingV mechanism operates. This may be effected in any suitable way, either by varying the path of the pile with relation to the trimming mechanism or by varying the plane or planes in which the trimming mechanism operates with relation to the path of the pile or by varying both. l/Vhere a machine is designed for trimming books, it is ordinarily only necessary to vary the relation` between the path of the pile and those elements of the trimming mechanism which operate to trim the sides and lower ends of the sheets forming the leaves of the books.

In the machine shown the pile supporting member 7 is designed to receive the backs of the books on the left-hand side, as viewed in Fig. 3, and the tops of the books on the right-hand side, as viewed in said figure, and means have been provided for varying the planes in which the knives 8 and 9 operate,said knives being arranged to respectively trim the sides and lower ends of the books. The adjustment of these knives may be effected in any desired manner. As shown, the

guide frames

14 and 15 with the knife bars 11 and 12 are so mounted upon a transverse supporting frame 17 that it may be moved inwardly and outwardly with relation to the path of the pile of books, said guide frames being rigidly held in their adjusted positions by suitable bolts, as shown In order to facilitate the trimming operations, the trimming knives are, preferably given a movement in the direction of their length during the successive trimming operations. This may be accomplished in any suitable way. In accordance with the construction shown, the

knife bars

12 and 13 are connected at their lower ends, as shown in Fig. 3, to a crosshead 18 mounted in suitable guide ways in the frame of the ma' chine, a slot and pin connection being provided between the knife bar 12 and the crosshead, as shown, to permit the adjustment of said knife bar. As shown, the crosshead 18 is given a reciprocating movement by a crank 19, which is connected to the crossliead by a link 20. The crank 19 is mounted on a shaft 21, which is connected by means of bevel gears 22, vertical shaft 23, and bevel gears 24,- with the main shaft 25, which may receive motion in any suitable inaiiner, as by the tight and loose pulleys 26, a flywheel 27 being provided to insure steadiiiess of operation.

The means shown for reciprocatin r the knife bar 11 consists of a lever 30 having a segmental gear connection with a lever 31 which is connected by a link 32 to the crosshead 18.

Any suitable mechanism may be provided for advancing the pile of sheets with relation to the trimming mechanism. In the machine shown this mechanism acts to advance the pile with a progressive movement such as is associated with the insertion of the untrimmed sheets or books at one point and the removal of the trimmed product at another point. In the specific construction sliownthe mechanism operates to interinittently advance the pile with relation to the trimming mechanism and to permit the addition of untriinined sheets to the forward 0r untrimined part of the pile in advance of the trimming mechanism and to permit the removal of the trimmed sheets from the rearward or trimmed part of the pile at the rear of the trimming mechanism. As shown, this advancing mechanism comprises afplate 35 adapted to engage the forward end of the pile and a plate 36 adapted to engage tlie rearward end of the pile, said plates being respectively mounted upon

crossheads

37 and 38 arranged to slide on the horizontal guide bars 39 and 40 rigidly fixed at the opposite sides of the machine. Preferably the advancing mechanism is constructed to compress or clamp the pile during the trimming operation. This may be accomplished by mechanism which varies widely as to form and arrangement. In the particular construction shown the advancing mechanism operates to intermittently clamp the pile during the trimming operation and release the saine to permit the addition thereto of untriinmed sheets and the delivery therefrom of the trimmed sheets. As shown, the crosshead 38 is connected by suitable mechanism, to be presently described, to a third crosshead 41, also slidably mounted upon the guide bars 39 and 40, said crosshead 41 being rigidly connected with the crosshead 37 by means of the side bars 42 and 43. As shown, the

crossheads

37 and 41 are reciprocated in unison by means of a crank 44 formed at an j intermediate point in the main shaft 25,

said crank being connected to the crosshead 37 by a connecting rod 45.

Any suitable means may be employed for effecting the movement of the crosshead 38 with respect to the

crossheads

37 and 41, as required to alternately clamp and release the pile. As shown, a bellcrank lever is pivotally mounted in the crosshead 41, said bellcrank lever having an arm 46 which is connected by a link 47 with t-he crosshead 38, which arm and link form a toggle by which the required clamping pressure is secured. For the purpose of operating the bellcrank lever the downwardly extending arm 48 thereof is arranged between a pair of cams 49 and 50, which are respectively mounted on

transverse shafts

51 and 52, the cam 49 serving to operate the toggle 46-47 at the forward end of the stroke of the pileadvancing mechanism to clamp the pile, and the cam 50 serving to operate the toggle at the rearward end of the stroke of the advancing mechanism to release the pile. As shown, the

shafts

51 and 52 are driven by means of suitable gearing from a longitudinal shaft 53, which receives motion from the shaft 21 by a sprocket chain 54 (see Fig. 2). As the length of the pile isl apt to vary somewhat from time to time, suitable means are preferably provided for compensating for the variations of the length of the pile or limiting the clamping pressure thereon. As shown, the link 47 of the toggle is connected to the crosshead 38 by means of a plunger 55 between which and the crosshead 38 is confined a suitable compression spring 56.

There the machine is to be employed for trimming books, i-t is desirable to provide means for compensatingV for the difference in thickness between the fronts and backs of the books so that the clamping pressure will be substantially uniform on all parts of the pile, said means being preferably constructed also to keep the planes of the sheets in all parts of the piles as nearly as possible at right angles to the planes in which the knives operate. This may be accomplished in any suitable way, as by constructing the pile-advancing mechanism to move the pile in a path of such curvature that each sheet in the pile will lie in a radius struck from a common center, the surfaces which engage the ends of the pile being also arranged in radii struck from the same center.

I have shown diagrainmatically one form of pile advancing mechanism adapted to advance the pile to the cutting mechanism in a curved path. In accordance with this construction the part 7 of the pile support which receives the folded edges of the book sections and which are therefore thicker, is curved so as to give the required curvature to the pile. To get the full benefit of the curved pile support the pile advancing plate 35 and the clam-p plate 36 should be caused to move in a correspondingly curved path so that at every point of their movement they will be substantially in radii struck from the center of curvature of the pile.

Vhere `the trimming stroke of the machine is short however the planes of the sheets of the parts of the pile acted upon by the trimming mechanism may be kept in `planes sufficiently nearly at right angles to the plane or planes in which the trimming mechanism operates for all practical purposes without providing for a curved path of movement of the pile. In the machine shown the plates 35 and 36 which engage the opposite ends of the pile are adjustably mounted upon the

crossheads

37 and 38, so that the parts of them which are adjacent to the backs of the books may be spaced farther apart than the opposite edges sufficiently to compensate for the greater thickness of the backs of the books, and said plates are so adjusted in the machine that the sheets which are at the center `of that portion of the pile which is acted upon by the cutters during each trimming operation are as nearly as may be at right angles to the plane or planes in which the cutters operate. l/Vhen the machine is so adjusted the plane of the shee-ts in that part of the pile which is first acted upon by the cutters during each trimming operation will deviate slightly in one direction from a plane at right angles to the path of the sheets,and the plane of the sheets which are last acted upon by the cutters will be slightly inclined in the opposite direction to a plane at right angles to the path of the pile, but the inclination of the planes of the sheets in each instance will be so slight as not to be noticeable in practice.

In accordance with the construction shown, each of the plates 35 and 36 is adjusted with relation to the cross heads 37 and 38, respectively,.by means of four set isheets may be removed from the pile4 by hand or by any suitable mechanism. One of the peculiar advantages of the machine shown and described, however, is that the untrimmed sheets may beV progressively added to the pile and the trimmed sheets progressively removed therefrom automatically, with certainty, and wit-hout undue complication. As shown, a feed table 60 is arranged at .one side of the machine adjacent to the forward part of the pile-advancing mechanism, said table being provided with a fixed front guide 61 and an adjustable side guide 62. The front guide 61 is arranged slightly in advance of the position occupied by the forward end of the pile at the end of the trimming operation, and the sideA guide 62 is so adjusted that the side of a pile of sheets placed on the feed table will slightly overlap the inner edge of the table so that as a suitable section of the pile is pushed forward or toward the right in Fig. 3, it will slide down into the trough-shaped support 7 and settle down therein with its lower adjacent sides in contact with the adjacent sides of the trough and thus be accurately positioned with relation to the pile of the sheets in the trough.- As the crosshead 37 reaches the forward end of its stroke, a section of the untrimmed pile of sheets on the feed table 60 may be advanced into the trough 7 between the plate and the forward end of the previously advanced pileof sheets in the trough either by hand or: by suitable mechanism. As shown, a pusher mechanism is provided, the same consisting of a pair of upwardly extending arms 63 connected at their upper i 65 projecting from the side frame 1.

ends by a crossbar of a proper length and rigidly connected at their lower ends to a short shaft 64 .journaled in a suitable bratiet ne of the arms 63 is projected downwardly to form an operating arm 66 which is engaged by a suitable cam 67 fixed to the shaft 21.

, As shown, the trimmed sheets are removed by simply providing a downwardly inclined chute 68 at the rear end of the trough 7, said chute being of such width as to permit a suitable part of the trimmed end of the pile to drop away and slide out of the machine when the cam mechanism is released at the rear end of the stroke of the pileadvancing mechanism.

The operation ofthe machine will be readily understood from the descriptionof the construction thereof. y

As the sheet pile-advancing mechanism reaches the forward end of its stroke, a suitable pile section of untrimmed sheets is placed between the plate 35 and the end of the pile ofsheets in the trough 7 either by hand or by suitable mechanism, such as that shown and described. The clamp plate 36 having been brought into contact with the rear end of the pile of sheets remaining in the trough 7 by the forward stroke of the pile-advancing mechanism, the cam 49 will operate to straighten the toggle 46, 47 and thus clamp the pile between the plates 35 and 36. lThe pile will then be moved forward so as to perform the trimming operation, the cutting knives being moved longitudinally to facilitate this operation. When the pile-advancing mechanism reaches the end of its rearward or trimming stroke, the cam 50 will operate to break the toggle 46, 47 and thus release the pile of sheets. The section of the trimmed sheets which lies over the chute 68 will then drop out. The forward stroke of the pile-advancing mechanism will serve to bring the plate 36 into contact with the rear end of the pile and provide space at the forward end of the pile for the insertion of a new section of untrimmed sheets. The stroke of the pileadvancing mechanism is preferably so adjusted that the plate 35 will not quite reach the foremost knife 8.

One advantage of this construction shown is that the knives are caused to operate on a practically continuous pile of paper so that the cutting beds heretofore universally employed are entirely dispensed with, and the cutting edges of the knives are at no time exposed so as to be a source of danger to the operator.

Another advantage is that by reason of this construction and arrangement of the pile support the sheets or books to be trimmed may be readily and accurately positioned in the machine and the pile retained in proper and accurate relationship to the trimming mechanism. It is also a marked advantage of this machine that the trimmings produced will by their own gravity fall away from the trimming and other mechanism at the point where they are formed so as not interfere with the operation of inserting and removing the sheets or books or otherwise impair the rapid and accurate operation of the machine.

It will be seen that the machine is simple and compact in construction and that it may be operated without the exercise of great care or skill, and that the trimming operations may be performed in rapid succession without interrupting the operation of the machine.

While I have particularly described my invention as embodied in a book-trimming machine, it is to be understood that the invention in its broader aspectsis not limited to a machine designed for this particular purpose nor to the particular construction shown or described, as many changes may be made in the mechanism by which the invention is carried into effect, depending upon the particular work to be performed vand upon the judgment or skill of the designer, without departing from the main principles of the invention and without sacrificing its chief advantages.

I-Iaving thus described my invention, what I claim and desire to secure by Letters Patent is:

l. In a machine for trimming a pile of sheets, the combination of trimming mechanism, and means for progressively advancing the pile .with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be added to the untrimmed part of the pile.

2. In a machine for trimming a pile of sheets, the combination of trimming mechanism, and means for intermittently advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed parts of the pile between the trimming periods.

3. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for intermittently advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to vthe untrimmed parts of the pile between the trimming periods, and means arranged to cooperate with the advancing means whereby the pile is maintained in a compressed conditiony during the trimming operation.

4. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for intermittently advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed parts of the pile between the trimming periods, and means for clamping the pile of sheets.

5. In a machine for trimming a pile of sheets, the combination of tr'imming mechanism, means for intermittently advancing the pile .with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed parts of the pile between the trimming periods, and means for clamping the pile of sheets, said clamping means being constructed to apply a limited force notwithstanding variations in the extent of the pile.

6. In a machine for trimming a vpile of sheets, the combination of a relatively iXed cutter, and means for progressively advancing the pile with relation to the cutter in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed part of the pile.

7. In a machine for trimming a pile of sheets, the combination of a relatively fixed cutter, means Jfor progressively advancing the pile with relation to the cutter in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed part of the pile, and means arranged to coperate with the advancing means whereby the pile is maintained in a compressed condition during the trimming operation.

8. In a machine for trimming a pile of sheets, the combination of a relatively fixed cutter, and means for intermittently advancing the pile with relation to the cutter in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be added to the untrimmed part of the pile between the trimming operations.

9. In a machine for trimming a pile oit sheets, the combination of a relatively liXed cutter, means for intermittently advancing the pile with relation to the cutter in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be added to the untrimmed part of the pile between the trimming operations, and means for clamping the pile of sheets during the trimming operations.

10. In a machine for trimming a pile oit' sheets, the combination of a plurality of relatively fixed cutters, each arranged to trim one side of the pile, and means for progressively advancing the pile with relation to the cutters in a direction transverse to the planes of the sheets, said means being con structed to permit sheets to be progressively added to the untrimmed part of the pile.

ll. In a machine for trimming a pile of sheets, the combination of a plurality of relatively fixed cutters, each arranged to trim one side of the pile, means for progressively advancing the pile with relation to the cutters in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed part of the pile, and means whereby the trimmed sheets are delivered from the trimmed part of the pile.

12. In a machine for trimming a pile of means whereby the pile is maintained in a Ycompressed condition during the trimming` cutter, means for progressively advancing the pile of sheets with relation to the cutter in a direction transverse to the planes of the sheets, and means for moving the cutter 4transversely tothe direction of the advanc- *Ving movement of the pile.

14. In a machine for trimming a pile of sheets, the combination of a relatively lixed cutter, means for intermittently advancing the pile with relation to the cutter in a direction transverse to the planes of the sheets, and means for moving the cutter transversely to the direction of the advancing movement of the pile simultaneously with said movement.

15. In a machine for trimming a pile of sheets, the combination of a relatively fixed cutter, means for intermittently advancing the pile wit-h relation to the cutter in a direction transverse to the planes of the sheets, means for moving the cutter transversely to the direction of the advancing movement of the pile simultaneously with said movement, and means arranged to coperate with the advancing means whereby the pile is maintained in a compressed condition during the trimming operations.

16. In a machine for trimming a pile of sheets, the combination oi a plurality of relatively fixed cutters, each arranged to trim one side of the pile, means for progressively advancing the pile with relation to the cutters in a direction transverse to the planes of the sheets, and means for movingthe cutters transversely to the direction of the advancing movement.

17. In a machine for trimming a pile of sheets, the combination of a plurality of relatively fixed cutters, each arranged to trim one'side of the pile, means for intermittently advancing the pile with relation to the cutters in a direction transverse to the planes of the sheets, means for moving the cutters transversely to the direction of the movement of the pile during such movement, and means for clamping the pile of sheets during the trimming operations.

18. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for progressively advancing the pile with relation tothe trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be successively added to thepile and means whereby the plane in which the trimming mechanism operates may be varied with relation to the path of the pile.

19. VIn a mechanism for trimming a pile of sheets, the combination of trimming mechanism, means for progressively advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed part of the pile, and means for effecting a variation of the plane in which the trimming mechanism operates with relation to the path of the pile.

20. In a machine for trimming a pile of sheets, the combination of a relatively fixed cutter, means for progressively advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be added to the untrimmed part of the pile, and means for eiiecting a variation between the plane in which the cutter operates and the path of the pile.

21. In a machine for trimming a pile of sheets, the combination of a relatively fixed cutter, means for progressively advancing the pile with relation to theV trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be added to the untrimmed. part of the pile, and means for eecting a variation of the plane in which the cutter operates with relation to the path of the pile.

22. In a machine for trimming a plle of sheets, the combination of a plurality of relatively fixed cutters, each arranged to trim one side of the pile, means for progressively advancing the pile with relation to the cutters in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be progressively added to the untrimmed part of the pile, and means for effecting a variation between the 'path of the pile and the planes in which the cutters for trimming adjacent sides of the pile operate.

23. In a machine for trimming a pile of sheets, the combination of trimming mechanism, a device for engaging an end of the pile for advancing the same with relatlon to the trimming mechanism in a direction transverse to the planes of the sheets, and means for varying the operative plane of said device with relation to the plane in which the trimming mechanism operates.

24. In a machine for trimming a pile of sheets, the combination of trimming mechanism, a device for engaging one end of the pile for advancing the same with relation to the trimming mechanism in a direction transverse to the' planes of the sheets, a device for engaging the opposite end of the pile to maintain the same in a compressed condition during the trimming operation, and means whereby the planes in which said pile-engaging devices operate' may be varied with relation to the planes in which the trimming mechanism operates.

25. In a machine for trimming a pile of sheets, the combination of a relatively fixed cutter, a device for intermittentlyengaging one end of the pile to advance the same with relation to the cutter in a direction transverse to the planes of the sheets, means for clamping the pile during its advancing movement, and means for varying the operative plane of said pile advancing device with relation to the plane in which the cutter operates.

26. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for supporting the pile with the sheets resting on their edges, and means for progressively advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be added to the untrimmed part of the pile.

27. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for supporting the pile with the sheets resting on two adjacent edges, means for progressively advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means-ibeing constructed to permit sheets to be added to the untrimmed part of the pile.

28. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for progressively advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, and means for feeding additional sheets to the untrimmed part of the pile.

29. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for progressively advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, said means being constructed to permit sheets to be added to the untrimmed part of the pile, and means whereby the trimmed sheets are delivered from the trimmed part of the pile.

30. In a machine for trimming a pile of sheets, the combination of trimming mechanism, means for progressively advancing the pile with relation to the trimming mechanism in a direction transverse to the planes of the sheets, means for feeding additional sheets to the untrimmed part of the pile, and means whereby the trimmed sheets are delivered from the trimmed part of the pile.

31. In a machine for trimming a pile of sheets or books, the combination with a trimming mechanism, off means for supporteffecting the release of the clamp after each trimming operation, whereby the sheets or books to'be trimmed can be placed in position on one side of the trimming mechanism and removed after trimming on the other side of said mechanism.

32. In a trimming machine for sheets or mechanism, of means for supportingV Vthe sheets or books o'n edge, means for producing a relative movement between said sheets or books and said trimming mechanism by which the trimming is effected, said movement causing the sheets or books to pass during the trimming operation from one side of the trimming mechanism to the other, a clamping mechanlsm, and means for effecting the release of the clampv after each trimming operation whereby the sheets or books to be trimmed can be placed in position on one side of the trimming mechanism and removed after trimming on the other side of said mechanism.

33. In a trimming machine for sheets or books, the combination with a trimming mechanism, of means for supporting the sheets or books during the trimming operation on two adjacent edges, and means for producing a relative movement between said sheets or books and said trimming mechanism for eecting the trimming operation.

34. In a paper trimming machine, the combination with a knife, of a pair of clamps arranged one on each side of the knife, a support for a pile of sheets or books, and means for causing the clamps to compress the pile and to feed it while compressed past the knife.

35. In a paper trimming machine, the combination with a trough arranged to support a ile of sheets or books on two adjacent si es, of a knife, a pair of clamps one on each side of the knife, and means for causing the clamps to compress the pile while in the trough and to feed it while compressed past the knife.

36. In a paper trimming machine, the combination with a trough arranged to support a pile of sheets or books on two adjacent sides, a plurality of knives arranged to trim a plurality of sides of the pile, a pair of clamps located and arranged one on each side of the knives, and means for causing the clamps to compress the pile and to feed it while compressed past the knives.

a0 books, the combination with a trimming 37. In a paper trimming machine, the

'combination with a trough arranged to support a pile of sheets or books on two adjacent sides, of a plurality of knives arranged to trim two or more sides of the pile, a pair of `clamps arranged one on each side of the knives, means for causing the clamps to compress the pile and feed whilecompressed pastthe knives, and means for feeding untrimmed sheets or books to the pile between successive trimming operations.

38. In a paper trimming machine, the combination with a knife, of means for supporting a pile of sheets or books in operative relation to the knife, a pair of clamps operating on opposite ends of the pile, means for operating the clamps to compress the pile, means for producing relative movements between the pile and the knife, whereby the knife is caused to trim a side of the pile, the distance between the clamps when 1n compressing position being greater than the said u relative movement.

39. In a paper trimming machine, the combination with a plurality of knives arranged to inclose a space, of means for feeding a pile of books or sheets through the space inclosed by the knives.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

SAMUEL K. WHITE.

Witnesses:

E. CAMBELENG, J. H. FREEMAN.