US2309600A - Sheet feeding mechanism - Google Patents

Description

Jan. 26, 1943 o. KLEINSCHMIT an, 2,309,600

SHEET FEEDING MECHANISM Filed April 19, 1941 4 Sheets-Sheet l gwuwwlklq OSKAR KLEINSQHMIT OSKAR M UEL-LER 1943 o. KLEINSCHMIT ETAL 2,309,600

SHEET FEEDING MECHANISM Filed April 19, 1941 4 Shets-Sheet 2 OSKAR KLJEINSOHMIT OSKAR 'MUELLIEH Jan. 26, 1943 o. KLEINSCHMIT arm. 2,309,600

SHEET FEEDING MECHANISM Filed April 19. 1941 4 Sheets-Sheet 3 O-SKAR Kusmscumn 4 OSKAR MUELLER Jan. 26, 1943' o. KLEINSCHMIT ETAL 2,309,600

SHEET FEEDING MECHANISM Filed April 19. 1941 4 Sheets-Sheet 4 gin 0014433 OSKAR KbE'INSGHMIT OSKAR MUELLER M W W4 Patented 'J. 26, 1943 SHEET FEEDING MECHANISM Oskar Kleinschmit and Oskar Mueller, mm- Plagwits, Germany; vested in the Alien Property Custodian Application April 19, 1941, Serial No. 389,452 Germany November 14, 1939 21 Claims. (CL 270-54) The invention relates to block stitching machines with a laterally arranged sheet feed mechanism from which the sheets are fed to the saddle of the machine upon which they are carried to stitching position.

It is known to deposit a sheet on to stationary or travelling feeding means, such as for instance a feeding chain or the like arranged close to the ordinary stitching saddle as a lateral elongation thereof when in its lower sheet receiving position. From the feed mechanism the sheet is pushed with increasing speed on to the stitching saddle by a pusher member against a sheet stop, where it is registered and held by suitable means (see U. 8. Patents 2,076,996 and 1,774,170).

The long stroke of this pusher member and its return movement to its initial position require a considerable movement or putting into action of masses, thus affecting the output of the machine.

Furthermore the linear feeding of sheets and their correct positioning on the saddle is not assured.

Feeding rolls are also known for use instead of pusher members. These rolls are arranged in pairs consisting of upper and lower rolls which are actuated by driving segments at a varying speed, which however remains steady in between the 2 rolls of the pair. The upper one of such pair of rolls is lifted and lowered corresponding to the swinging in and out of the stitching saddle. In the opened stage in which the upper roll is lifted the sheet is pushed between these rolls. On closing, the rolls have a speed corresponding to the speed of the fed sheets and rapidly increases, so that by the time of opening of the rolls the sheet has the speed necessary to throw it against the sheet stop on the stitching saddle (see German Patent No. 644,071 or the corresponding British Patent No. 462,449). Also in this instance considerable masses are put into action by reason of the segment construction, while, in .the interest of an increased output, it would be of advantage to avoid this.

Also the feeding of sheets by means of a feeding chain having roof-like members onto which the sheets are deposited straddlewise, never is absolutely rectilinear, but always subject to certain irregularities. These irregularities are imparted to the sheets riding in straddlewise fashion along the roofs of the chain members, so that the feeding rolls are apt to engage the sheet not exactly in the apex of the fold edge, and feed it improperly, when it arrives in badly registered condition. Furthermore the driving plicated and heavy, and it may occur that its swinging masses damage thin sheets or soft papers on engagement. The travelling feeding of sheets by means of a continuously feeding chain offers, however, such great advantages that hitherto the disadvantage of the aforedescribed irregularities was endured, even if the speed of the machine had to be reduced on account thereof.

Besides this in the hitherto known constructions the opening and closing movements of the feeding rolls took place in a vertical plane perpendicular to the feeding direction. In other words the axis of the upper roll was tilted causing the upper roll to move out of the plane containing the lower roll. Thus when working on thicker signatures it happened that the upper roll in being lowered did not quite register in the plane of the lower roll so that the rolls lost their proper alinement.

The present invention overcomes all these disadvantages and makes provision that the sheets in spite of the unsteady chain feed are fed in absolutely rectinlinear registration. This is accomplished by replacing the chain roofs by a stationary feeding bar, secured in a suitable manner above the ordinary chain members, thus forming the stationary feeding saddle, from which the well known carrier pins push the sheet to a position between the feeding rolls. Furthermore the possibility of .the sheets being pressed in incorrect position in between the pair of rolls is overcome by the following provision:

The pair of rolls is opened by lifting of the upper roll without moving it out of the plane containing the lower roll. Thus the upper roll is kept in the plane of feeding, and the swinging masses of the rolls are considerably reduced, as the latter are continuously driven, i. e., travelling in one direction only. Thus only the upper roll and its swinging bearing ,holder have to be taken into consideration as swinging masses. The result obtained thereby resides in an entirely linear feeding, an increased output of machine and a complete avoiding of waste paper, even in case of badly packed sheets.

It is further of decided advantage that the drive for the feeding rolls can be accomplished directly by a motor the rotary speed of which can easily be regulated and adapted to the varying qualities of work to be handled. Thus the drive is much more simple compared with constructions wherein it is performed by the stitching machine itself. Instead of the separate mechanism for such feeding rolls is rather commotor drive the drive of the feeding rolls might be derived from the driving pulley of the machine. To make the speed of the feeding rolls independent of the machine speed, a friction gear wheel mechanism is provided. The possibility to regulate the drive of the feeding rolls independently of the drive of the machine oifers the advantage that the force imparted to the sheet by the feeding rolls can be adapted to the quality of paper handled, so that the sheets are in any case brought into accurate contact with the registering stop on the stitching saddle. The main advantage of the separate motor drive resides, however, in the fact, that the revolution of the feed rolls is no longer dependent upon intended or unintended irregularities in the machine speed, which can badly influence the propelling force of these rolls in regard to a proper feeding of sheets.

The features of the aforedescribed invention are shown by way of example in the accompanying drawings, wherein:

Figure 1 is a front view of a book stitching machine,

Fig. 2 is a lateral section taken on line I-I of Fig. 1 the stitching saddle being in open posi-- tion.

Fig. 3 is a front view of the drivlngmechanism of the feeding rolls taken in the direction of the arrow in Fig. 2.

Fig. 4 is a partial plan view of the feedin mechanism.

Fig. 5 is an enlarged sectional view taken on line II-II of Fig. 3 through the oscillating bearing of the upper feeding roll.

Fig. 6 is an enlarged sectional view of the feed-. ing chain taken on line III-III of Fig. 1.

Fig. 7 is a front view of a modified form of feeding mechanism according to the invention.

Fig. 8 is a transverse sectional view through the feeding saddle taken on line IV-IV of Fig. 7.

As shown in the drawings the book stitching machine I has a reciprocating feeding saddle 2, close to which, in elongation to its feeding position, an arm 4 (Fig. 1) is mounted on frame 3 and carries the feeding mechanism, which in this instance is an ordinary chain 5. The feeding mechanism is positioned so that it aligns with the saddle 2 in the sheet receiving position .of the latter. Some of the chain members are equipped with carrier pins 6 to forward the sheet 8. Above the feeding chain a stationary narrow bar 1 is positioned and secured to arm 4. The sheets are deposited straddlewise either manually or automatically on said bar I. This stationary bar 1 with a roofiike upper edge offers the sheets deposited thereon a reliable and absolutely rectilinear feeding corresponding to the rooflike edge of the lower feeding roll 9.

The upper feeding roll I positioned adjacent the frame and provided with a groove ii (Fig. for receiving the roof-like edge of the lower feeding roll 9 (Fig. 1-3) is lifted by means of its holder or lever l4 in the'feeding plane about the shaft l2 of lever l4, rocking in the bearing i3 (Fig. 2-5). The rocking movement of lever I4 is effected by cam l5 through a link [5a pivotally mounted at its upper end on a projection of lever Id. The shaft i2 and the shaft of roll ill are connected by intermeshed gear wheels 22 and 23 respectively, gear wheel 22 being fixedly mounted on shaft l2 and gear wheel 23 being fixedly connected to the shaft of roll N (Fig. 5). In driving the rolls rotary motion is transferred from motor i6 (Fig. 1-4) by means of pulley I! to the corresponding pulley 18 of the intermediate shaft i9.

The shaft I9 carries pulleys 19a. and Ilb which are connected by belts to pulleys 20 and 2| respectively which in turn drive rolls i9 and 9 respectively.

The narrow stationary bar 1, sharpened at its upper edge to provide the roof like edge and positioned in alinement with rollers 9 and I9, ensures an absolutely rectilinear feeding of sheet 8 in its fold which corresponds to the apex of saddle 2. In this correct position the sheet is held tightly on the saddle until the same has reached the stitching position, i. e., until it arrives under the stitching needles, so that a displacement or rolling of the sheet can no longer occur. I I t 1 Instead of the chain 5 the stationary rail or bar I could also co-act with a reciprocatory stop 25 adjustable according to the size of the paper handled, the stroke of which needs not be greater than to allow the sheet to be forwarded from the feeding station at which it is placed on the bar I to a position between the rolls 9 and I.

This construction requires less room than the chain mechanism, and is diagrammatically shown in Fig. '7. Also in this instance bar I is mounted on the stationary arm 4. On or below this bar there is a reciprocatory adjustable stop 25, the stroke of which is adapted to push a sheet deposited on bar 1 from the feeding station to a position between rolls 9 and [0. Also here the exact alinement of feeding bar 1, pressure rolls 9 and Ill and apex of saddle 2 is of decisive importance and forms the novel feature responsible for a smooth and non-stop working of the machine, only achieved by means of the novel co-operation of the aforedescribed elements.

The working of the machine is obvious without difflculties. The narrow bar I with its rooflike feeding edge which properly fits into the fold of the sheets deposited thereon provides for a proper feeding of sheets and a linear guidance of the fold edge. As the peripheral edge of the lower roll lies exactly in elongation of the apex of this bar 1, the sheet is also maintained in its fold line during the further stages of the feeding operation by the rolls. Furthermore the upper roller exactly fits onto the lower one, its lifting and lowering movement taking place in the feeding plane of sheets, and thus none of the respective stationary or travelling guiding parts will displace the sheet, traveling therebetween, out of its exactly linear direction and positionnot even when the sheet is transferred from feeding mechanism to the stitching saddle 2 of stitching machine, positioned in alinement with the aforedescribed feeding means. The sheet will remain in this correct position during the swinging in movement of the stitching saddle into the stitching position until it is finally pierced by the piercing needles.

From the foregoing it will be appreciated that the present invention provides a feeding mechanism including a pair of disc-like feeding rolls having cooperating roof like and V-grooved peripheral portions with the apex portions of the cooperating surfaces of the two rolls lying always in the same plane, both when the rolls are in feeding position and when they are separated to permit feeding of a sheet between them.

We claim:

1. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a thin elongated sheet supporting element lying in a vertical plane and mounted to register in alignment with the saddle when the latter is in its sheet receiving position, and means for displacing a folded sheet from said element longitudinally of the elementand with its fold in accurate register with the upper edge of the element, onto said saddle.

2. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a thin elongated sheet supporting element lying in a vertical plane and mounted to register in alignment with the saddle when the latter is in its sheet receiving position, the upper edge of said element being of roof shape and the apex thereof being in register with the apex of the saddle when the latter is in its sheet receiving position, and means for displacing a folded sheet from said element longitudinally of the element onto said saddle with the fold of the sheet in accurate register with the apex of the element.

3. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar lying in a vertical plane and having its upper edge of roof shape-to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex-line of the saddle when the latter is in its sheet receiving position, and means for displacing a sheet from said bar longitudinally of the bar onto said saddle with the fold of the sheet in accurate register with the apex of the element.

4. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar lying in a vertical plane and having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, a traveling endless flexible member having a stretch parallel to and adjacent the apex line of the bar,

sheet engaging means carried by said flexible member for displacing a sheet along said bar longitudinally of the bar, and means for displacing a sheet from said bar longitudinally of the bar onto said saddle with the fold of the sheet in accurate register with the apex of the element.

5. A sheet feed device for use in a book-stitch-- ing machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar lying in a vertical plane and having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle 7t when the latter is in its sheet receiving position, means including a reciprocating sheet engaging member displaceable adjacent and parallel to the apex line of said bar for advancing sheets along said bar, means including a reciprocating sheet engaging member above the upper edge of the saddle, and means to maintain the synchronism between this sheet engaging member and the stitching saddle, for bringing a sheet in accurate alignment from said bar longitudinally thereof onto said saddle.

6. A sheeti'eed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle whichv is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar lying in a vertical plane and having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in absolute register with the apex line of the upper edge of the bar, said apex line of the upper edge 01' the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, sheet engaging roll means to forward a sheet from said bar longitudinally of the bar onto said saddle, and means for moving a sheet from the sheet receiving portion of said bar into a position to be engaged by the roll means, and means for actuating the roll means in synchronism' with the alternate movement of the stitching saddle from the sheet receiving to the stitching position. I 7. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary lat erally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register withthe apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, sheet engaging roll means for displacing a sheet from said bar longitudinally of the bar onto said saddle including a lower roll having a v-shaped radially outwardly projecting portion and an upper roll having a V-shaped groove in its periphery to receive the corresponding outwardly projecting portion of the lower roll the lower roll being mounted for rotation about a fixed axis and so that the apex line of the bar is tangential to the outer periphery thereof, and means for lifting the upper roll from engagement with the point of tangency of said apex line with the lower roll while maintaining its axis of rotation parallel to the axis of rotation of the lower roll.

8. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge, of roof shape to receive folded sheets straddlewise with the sheet fold inregister with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, sheet engaging roll means for displacing a sheet from said bar longitudinally ofthe bar onto said saddle including a lower roll having a V-shaped radially outwardly projecting portion and an upper roll having a V- shaped groove in its periphery to receive the. corresponding outwardly projecting portion of the lower roll, the lower roll being mounted for rotation about a fixed axis and so that the apex line of the bar is tangential to the outer periphery thereof, means for lifting the upper roll from engagement with the point of tangency of said apex line with the lower roll while maintaining its axis of rotation parallel to the axis of rotation of the lower roll, and means for displacing a sheet from the sheet receiving portion of said bar into a-position to be engaged by the roll means.

9. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, sheet engaging roll means for displacing a sheet from said bar longitudinally of the bar onto said saddle including a lower roll having a V-shaped radially outwardly projecting portion and an upper roll having a V-shaped groove in its periphery to receive the corresponding outwardly projecting portion of the lower roll the lower roll being mounted for rotation about a fixed axis and so that the apex line of the bar is tangential to the outer periphery thereof, a lever pivotally mounted on an axis parallel to the axis of the lower roll and spaced therefrom longitudinally of the bar, and the upper roll being carried by said lever for rotation about an axis parallel to the axis of the lower roll, and means for swinging said lever about its pivot to raise and lower the upper roll.

10. A sheet feed device for use in a book-stitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet 1'81 ceiving position, comprising a stationary lat.-,

' erally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, sheet engaging roll means for displacing a sheet from said bar longitudinally of the bar onto said saddle, means {or displacing a sheet from the sheet receiving portion of said bar into a position to be engaged by the roll means, and means independent of the stitching machine drive for rotating said roll means.

11. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, a lower roll mounted for rotation about afixed axis, a level pivotally mounted about a fixed axis parallel to that of the lower roll and spaced therefrom longitudinally of the bar, an upper roll carried by the lever for rotation about a movable axis always parallel to said fixed axes, and means for lilting said upper roll and its lever to enable a sheet to enter between the peripheral portions of said upper and lower rollers.

12. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the her, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, a lower roll mounted for rotation about a fixed axis, an upper rotatable roll, and means for raising and lowering the upper roll while maintaining the upper roll in a plane containing the lower roll.

13. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line 'of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, sheet engaging roll means for displacing a sheet from said bar longitudinally of the bar onto said saddle including a lower roll having a V-shaped radially outwardly projecting portion and an upper roll having a V-shaped groove in its periphery to receive the corresponding outwardly projecting portion of the lower roll the lower roll being mounted for rotation about a fixed axis and so that the apex line of the bar is tangential to the outer periphery thereof, and means for lifting the upper roll from engagement with the point of tangency of said apex line with the lower roll while maintaining the apex circle of the groove of the upper roll in the same plane containing the apex circle of the lower roll on the apex line of the bar.

14. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, a lower roll mounted for rotation about a fixed axis, a lever pivotally mounted about a fixed axis parallel to that of the lower roll and spaced therefrom longitudinally of the bar, an upper roll carried by the lever for rotation about a movable axis always parallel to said fixed axes, means for lifting said upper roll and its lever to enable a sheet to enter between the peripheral portions of said upper and lower rollers, and means rototably mounted coaxially of the pivoting axis of the lever for driving the upper roll.

15. A sheet feed device for use in a bookstitohing machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, a lower roll mounted for rotation about a fixed axis, a lever pivotally mounted about a fixed axis parallel to that of the lower roll and spaced therefrom longitudinally of the bar, an upp r r011 carried by the lever for rotation about a movable axis always parallel to said fixed axes, means for lifting said upper roll-and its lever to enable a sheet to enter between the peripheral portions of said upper and lower rollers, a gear wheel fixed to the upper roll and rotatable coaxially therewith, a second gear wheel meshing with the aforesaid gear wheel and mounted for rotation coaxially of the axis about which the lever pivots, and means for rotating said second gear wheel to in turn rotate said upper roll.

16. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, sheet engaging roll means for displacing a sheet from said bar longitudinally of the bar onto said saddle including a lower r011 having a V-shaped radially outwardly projecting portion and an upper roll having a v-shaped groove in its periphery to receive the corresponding outwardly projecting portion of the lower roll the lower roll being mounted for rotation about a fixed axis and so that the apex line of the bar is tangential to the outer periphery thereof, a lever pivotally mounted on an axis parallel to the axis of the lower roll and spaced therefrom parallel to the axis of the lower roll, means for swinging said lever about its pivot to raise and lower the upper roll, a gear wheel fixed to the upper roll and rotatable coaxially therewith, a second gear wheel meshing with the aforesaid gear wheel and mounted for rotation coaxially of the axis about which the lever pivots, and means for rotating said second gear wheel to in turn rotate said upper roll.

17. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the a longitudinally of the bar, and the upper roll being I carried by said lever for rotation about an axis upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, a lower roll mounted for rotation about a fixed axis, a'lever pivotally mounted about a fixed axis parallel to that of the lower roll and spaced therefrom longitudinally of the bar, an'upper roll carried by the lever for rotation about a movable axis always paralle1 to said fixed axes, means for lifting said upper roll and its lever to enable a sheet to enter between the peripheral portions of said upper and lower rollers, a gear wheel fixed to the upper roll and rotatable coaxially therewith, a second gear wheel meshing with the aforesaid gear wheel and mounted for rotation coaxially of the axis about which the lever pivots, a driving element rotatable coaxially with said second gear wheel, a driving element rotatable coaxially with the lower roll, and means common to both of said driving elements for importing rotary movement thereto.

18. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, a lower roll mounted for rotation about a fixed axis, a lever pivotally mounted about a fixed axis parallel to that of the lower roll and spaced therefrom longitudinally of the bar, an upper roll carried by the lever for rotation about a movable axis always parallel to said fixed axes, means for lifting said upper roll and its lever to enable a sheet to enter between the peripheral portions of said upper and lower rollers, a gear wheel fixed to the'upper roll and rotatable coaxially therewith, a second gear wheel meshing with the aforesaid gear wheel and mounted for rotation coaxially of the axis about which the lever pivots, a driving element rotatable coaxially with said second gear wheel, a driving element rotatable coaxially with the lower roll, and means independent of the stitching machine drive and common to both of said driving elements for importing rotary movement thereto.

19. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a thin elongated sheet supporting element lying in a vertical plane and mounted to register in alignment with the saddle when the latter is in its sheet receiving position, means engaging the sheet on both sides of the sheet supporting element for advancing the sheet along said element without disturbing the register of the'sheet with the element, and means for displacing a folded sheet from said element longitudinally of the element and with its fold in accurate register with the upper edge of the element, onto said saddle.

20. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of roof shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, means engaging the sheet on both sides of the sheet supporting element for advancing the sheet along said element without disturbing the register of the sheet with the element, and means for displacing a sheet from said bar longitudinally of the bar onto said saddle with the fold of the sheet in accurate register with the apex of the element.

21. A sheet feed device for use in a bookstitching machine having a pivotal sheet carrier or stitching saddle which is arranged to assume alternately a stitching position and a sheet receiving position, comprising a stationary laterally thin bar having its upper edge of root shape to receive folded sheets straddlewise with the sheet fold in register with the apex line of the upper edge of the bar, said apex line of the upper edge of the bar being in alignment with the apex line of the saddle when the latter is in its sheet receiving position, means engaging the sheet on both sides of the sheet supporting element for advancing the sheet along said element without disturbing the register of the sheet with the element, sheet engaging roll means for displacing a sheet from said bar longitudinally of the bar onto said saddle including a lower roll having a v-shaped radially outwardly projecting portion and an upper roll having a V-shaped groove in its periphery to receive the corresponding outwardly projecting portion of the lower roll the lower roll being mounted for rotation about a fixed axis and so that the apex line or the bar is tangential to the outer periphery thereof, and means for lifting the upper roll from engagement with the point of tangency of said apex line with the lower roll while maintaining its axis of rotaticin parallel to the axis of rotation of the lower 1'0 1.

OSKAR KLEINSCHMIT. OSKAR MUELLER

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