US1966061A - Bed and cylinder printing press - Google Patents

Description

July 10, 1934. c. B. COTTRELL, 3D

BED AND CYLINDER PRINTING PRESS Filed Dec. 14, 1931 4 Sheets-Sheet 1 ATTORNEYS July 10, 1934.

C. B. COTTRELL, 3D BED AND CYLINDER PRINTING PRESS Filed Dec. 14, 1931 4 Sheets-Sheet 2 I 1, rydefl n ll l I N NI fin N M. mm mm W m .Nm 7 l M J g l M e AW N M HN 3%.

ATTORNEYS July 10, 1934.

c. B. COTTRELL, an

BED AND CYLINDER PRINTING PRESS Filed Dec. 14, 1931 4 Sheets-Sheet 5 INVENTOR WW? III] II II II IIIIIIIII'IIIIIIIL Fill} a J W ATTORNEYS C. B. CCTTRELL, 3D

BED PND CYLINDER PRINTING PRESS July 10,. 1934.

Filed Dec. 14, 1931 4 Sheets-Sheet 4 mvENTOR ATTORNEYS V pression cylinder grippers,

Patented July 10, 1934 UNITED STATES 1,966,061 BED AND CYLINDER,- PRINTING PRESS Calvert B. Cottrell, 3d, Westerly, 11.1., assignor to C. B. Cottrell & Sons Company, Westerly, R. I.,

a corporation of Delaware Application December 14, 1931, Serial No. 580,863

8 Claims.

My invention comprises certain improvements in a bed and cylinder press whereby the oscillating impression cylinder is arranged to'take an unprinted sheet on its forward or printing stroke and to transfer the printed sheet tail end first on its reverse or non-printing stroke.

A practical embodiment of my invention is represented in the accompanying drawings in which:

Fig. 1 represents a side elevation of my improved bed and cylinder printing press, the parts being shown in full lines in the positions they assume just after the bed and cylinder have started on their forward or printing stroke, and in dotted lines in the positions they assume at the end of the said forward or printing stroke;

Fig. 2 represents a similar view with the parts shown in the positions they assume when the bed and cylinder are partway of their reverse or non-printing stroke; the inking mechanism in this view being shown in dotted lines, moved to a point where its distributing and form rollers can be readily washed without removal;

Fig. 3 represents a detail side View partly'in section on an enlarged scale, of a suitable means for operating the impression cylinder grippers, the sheet feed stop and the device for stripping the sheets tail end first from the impression cylinder;

Fig. 4 represents a detail top plan view partly in section, of some-of the parts shown in Fig. 3;

Fig. 5 represents a detail view partly in section, of the mechanism for operating the movable pin which controls the tumbler cam of the imthe pin being shown held in its operative position in the path. of the cam by its cam on the form bed whichcontrols the closing of the grippers;

Fig. 6 represents asimilar view with the tumbler pin in its, inoperative position out of the path of the cam and passing under the yielding operating cam on the form bed which controls the opening of the grippers;

Fig. 7 represents a detail side view of the re.- ciprocating form bed, the form member in this view being shown raised into positionto bring the form into contact with the form rollers, of the inkingmechanism on the forwarder printing stroke of the bed;

Fig. 8 represents a similar view with the form member shown loweredinto position to bring'the form out of contact withthe form .rollers-onithe reverse or nonsprinting stroke of the-bed;

Fig. 9,represents a transverse vertical section through the bed taken in the plane of theline IX-IX of Fig. '7, lookingthe arrows.

Fig. 10 represents abottom plan View of the upper or form member of the bed;

in the direction of Fig. 11 represents a top plan view of the lower or base member of the bed;

Fig. 12 represents an end view of the form member;

Fig. 13 represents an end view of the base member;

Fig. 14 represents a diagrammatic view of the impression cylinder and its adjacent parts in the positions they assume just after the impression cylinder has started on the first revolution of its forward or printing stroke;

Fig. 15 represents a similar view just after the impression cylinder has started on the second revolution of its forward stroke;

Fig. 16 represents a similar view as the impression cylinder reaches the end of its forward stroke during the second revolution and is ready to start on the first revolution of its reverse or non-printing stroke;

Fig. 1'1 represents a similar view as the impression cylinder passes the gripper opening point during its first revolution on its reverse stroke;

Fig. 18 represents a similar view as the impression cylinder reaches the end of its first revolution on the reverse stroke;

Fig. 19 represents a similar view as the impression cylinder reaches the end of its reverse stroke during its second revolution.

The main frame of the printing press is denoted by 1. The form bed which is fitted to reciprocate in the main frame is shown as comprising an upper or form. member 2 and a lower or base member 3', the upper member serving to carry the printing form. 4 and having a limited A diagonal sliding movement on the lower or base member 3 longitudinally of the. press, in the presentinstance by providing the upper or form member 2. with an inclined bottom surface and the-base member 3 with a coacting reversely inclined top surface.

A lost motion connection is provided between the form and base members and the two members are slidably interlocked against lateral displacement. as follows:

The bottomrsurface of the form member 2 has longitudinal grooves 5- which. terminate at the rear end of the form member. ina cross recess 6. The top surface of the base member 3 is provided with longitudinal ribs '7 located in the longitudinal grooves 5., a cross rib 8 at the front end. of the base member overlapping the front endof the-form. member anda cross rib 9 at the rear end of. the base member located in the cross recess 6. of the form member. The front cross rib. 8 of the base member serves to limit the forward and upward Sliding movement of the form member on the base member and the rear cross rib 9 serves to limit the rearward and downward sliding movement of the'formmember on the'base member.

posed fixedly mounted cylinders 13 and 14 below the form bed. The the cylinder 13 is connected to an arm 16 depending from the front end of the form member moving the'bed rearwardly and the piston 17 which slides in the cylinder 14 is connected to an arm 18 depending from the rear end of the form member 2 for moving the bed forwardly. As this bed reciprocating means forms no part of the present invention it will not be more specifically described herein, it being understood that suitable motive fluid connections are provided to ensure the reciprocation of the bed by the pumps 11 and 12.

The inking mechanism is shown as comprising an ink fountain l9, distributing rollers 20, form rollers 21 continuously in one direction to ensure an even application of the ink to the form 4 on the forward or printing stroke of the bed.

This inking mechanism reciprocating bed and it whole lengthwise along the machine in the main frame 1 to a point such as that shown in dotted lines in Fig. 2 where the distributing and form rollers of the inking mechanism can be readily washed without removing mechanism.

The oscillating impression cylinder 23 is fixedly mounted in the main frame 1 and it is geared at all times to the reciprocating bed through the usual gear and rack connection 24, 25, the rack being attached to the form member 2 of the bed so that the form and cylinder are kept in perfect register in the operation of the press. The movement of the bed is sufficient to rotate the cylinder more than one revolution, preferably about one and one-half revolutions, in each direction.

This oscillating impression cylinder is mounted above the may be shifted as a 26 are opened to release the head end of a printed sheet after the impression cylinder has rotated about one-half of a revolution on its reverse stroke and are permitted to remain open until the impression cylinder finishes its reverse stroke of substantially one and one-half revolutions and the printed sheet has left the cylinder. The grippers are closed on the head end of the unprinted sheet at the beginning of the first revolution of the forward or printing stroke of the cylinder and stay closed during substantially the one and To accomplish this result I provide a tumbler cam operating pin 28 which is slidable laterally into and out of piston 15 which slides for rocking the lever to move the pin 28 into the path of the tumbler cam for closing the grippers onto the unprinted sheet at the start of the forward or printing strokes of the bed and the cylinder. The stud or roller on this arm 32 of the rock lever is also arranged in position to be engaged about the end of the first one-half revolution in the reverse stroke of the cylinder to release the head end of the printed sheet. This cam 34 is so formed that the stud or roller on the arm 32 of the rock lever will travel inside the cam on the forward movement of the bed and on the outside of the cam to be operated thereby on the rearward movement of the bed as will be clearly seen by reference to Figs. 3, 4 and 6 of the drawings.

The sheet feed table which may be a part of any well known or approved sheet feeding mechanism is denoted by 35 and it is arranged to feed the unprinted sheets to the under side of the impression cylinder. The movement of the sheet feed stop 36 is controlled by a cam 37 on the reciprocating bed, said cam being arranged to 'engage a stud or roller 38 on the lower end of a rod 39 depending from the arm 40 of a rock lever pivoted at 41, the other arm 42 of which lever is engaged by a spring 43 arranged to normally hold the sheet stop 36 depressed.

The sheet delivery mechanism may also be of any well known or approved form, that shown herein comprising the endless sheet carrier 45 and the coacting sheet delivery rolls 46, 47.

The sheet stripper 44 is depressed into position to strip the printed sheet tail end first from the upper side of the impression cylinder immediately after the start of the reverse stroke of the cylinder, the said stripper being normally held out of engagement with the cylinder by a spring 48 on the rod 49. A stripper operating cam 50 on the reciprocating bed is arranged in position to engage a stud or roller 51 on the rod 49 to depress the said stripper into engagement with the impression cylinder at the proper time to strip the tail end of the printed sheet therefrom.

The operation of the printing press is as follows:

form bed and impression cylinder are started on their forward or printing strokes the impression cylinder grippers will be closed on the head end of an unprinted sheet and the form member of the bed will be raised into its printing position. As the bed is moved to the end of its forward or printing stroke the impression cylinder will be rotated about one and one-half revolutions and the form on the bed will have been the sheet on the impression cylinder will have with the form rollers of the inking mechanism. Also, the stripper of the delivery mechanism is lowered into contact with the impression cylinder and thereby strips printed side up to the coacting rollers 46, 4-7 of the delivery mechanism, which rollers then take control of the sheet. When the impression cylinder has rotated a short distance on its reverse stroke, in the present instance about one-half a revolution, the grippers are opened to release the head end of the printed sheet. These grippers are permitted. to remain open during the remainder of the reverse stroke of the impression cylinder.

From the above description it will be seen that by feeding the unprinted sheet to the under side of the impression cylinder and by delivering the printed sheet tail end first from the upper side of the impression cylinder a considerable amount of waste movement of both the cylinder and the bed is eliminated, the printing of the sheet being started immediately after the head end is taken by the grippers at the start of the forward strokes of the cylinder and bed and the necessary reverse movement of the cylinder being mostly utilized in transferring the printed sheet therefrom.

It will also be seen that the lowering of the form member on the reverse stroke of the bed permits the distributing and form rollers of the inking mechanism to be driven continuously in one direction only, by a motor which is independent of the bed drive; thereby ensuring an even working up, distribution and application of the ink.

It will also be seen that when it is desired to wash the distributing and form rollers the inking mechanism as a Whole may be moved lengthwise of the press to a point where the rollers can be washed without removing them from the inking mechanism.

The inking mechanism shown and described but not specifically claimed herein forms the subject matter of my copending application filed April 28th, 1931, Serial No. 533,426, of which this application is a division.

It is evident that various changes may be resorted to in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention, and hence I do not intend to be limited to the particular embodiment herein shown and described, but

What I claim is:

1. In a bed and cylinder printing press, a reciprocating form bed comprising upper and lower members, the lower member being movable in a single plane, an impression cylinder mounted on a fixed axis and having an oscillating movement through more than one revolution, means for feeding an unprinted sheet to the impression cylinder on its forward stroke, and means for taking the printed sheet tail end first from the cylinder on its reverse stroke.

2. In a bed and cylinder printing press, a reciprocating form bed comprising upper and lower members, the lower member being movable in a single plane, an impression cylinder mounted on a fixed axis and having an oscillating movement through more than one revolution, means for feeding an unprinted sheet to the underside of said cylinder on its forward stroke, and means for taking the printed sheet tail end first from the upper side of the cylinder on its reverse stroke.

3. In a bed and cylinder printing press, a reciprocating form bed comprising upper and lower members, the lower member being movable in a single plane, an impression cylinder mounted on a fixed axis and having an oscillating movement through more than one revolution, means for feeding an unprinted sheet to the impression cylinder at the beginning of its printing stroke, and means for taking the printed sheet tail end first from the cylinder at the beginning of its nonprinting stroke.

4. In a bed and cylinder printing press, a reciprocating form bed comprising upper and lower members, the lower member being movable in a single plane, an impression cylinder mounted on a fixed axis and having an oscillating movement through more than one revolution, means for feeding an unprinted sheet to the under side of said cylinder at the beginning of its printing stroke, and means for taking the printed sheet tail end first from the upper side of said cylinder at the beginning of its non-printing stroke.

5. In a bed and cylinder printing press, a reciprocating form bed comprising upper and lower members, the lower member being movable in a single plane, an oscillating impression cylinder mounted on a fixed axis and having sheet grippers, means for closing the grippers at a predetermined point in the forward stroke of the cylinder to grasp the head end of an unprinted sheet and for opening the grippers at said predetermined point to release the printed sheet on the reverse stroke of the cylinder, and means for taking the sheet tail end first from the cylinder during said reverse stroke.

6. In a bed and cylinder printing press, an oscillating impression cylinder mounted on a fixed axis, means for feeding unprinted sheets thereto, means for taking the printed sheets therefrom tail end first, a reciprocating form bed comprising upper and lower members, the lower member being movable in a single plane arranged to print the sheets on the forward strokes of the bed, and an inking mechanism located above the bed having its form rollers arranged to ink the form on the forward strokes only of the bed.

7. In a bed and cylinder printing press, an oscillating impression cylinder mounted on a fixed axis, means for feeding unprinted sheets thereto, means for taking the printed sheets therefrom tail end first, a reciprocating form bed comprising upper and lower members, the lower member being movable in a single plane arranged to print the sheets on the forward strokes of the bed, an inking mechanism located above the bed having its form rollers arranged to ink the form on the forward strokes only of the bed, and means for automatically lowering the form out of position to contact with the form rollers of the inking mechanism on the reverse strokes of the bed.

8. In a bed and cylinder printing press, an 0scillating impression cylinder, means for feeding unprinted sheets thereto, means for taking the printed sheets therefrom tail end first, a reciprocating form bed arranged to print the sheets on the forward strokes of the bed, an inking mechanism located above the bed having its form rollers arranged to ink the form on the forward strokes of the bed, means for automatically lowering the form out of position to contact with the form rollers of the inking mechanism on the reverse strokes of the bed, and means for driving the form rollers continuously in one direction only.

CALVERT B. CO'ITRELL, 3RD.

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