US20130113156A1

US20130113156A1 - Feeder mechanism with adjustable pickup heads

Info

Publication number: US20130113156A1
Application number: US13/291,353
Authority: US
Inventors: James J. Keller
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-08
Filing date: 2011-11-08
Publication date: 2013-05-09

Abstract

In a sheet feeder apparatus, a feeder mechanism for picking up sheets from a stack of sheets of a material includes a support bar, at least one pickup head, and an adjuster. The support bar includes cylindrical ends and an intermediate portion between the cylindrical ends. The cylindrical ends are configured to pivotally couple to control arms of the sheet feeder apparatus. The pickup heads are coupled to the intermediate portion of the support bar and an adjuster is coupled to the support bar at one of the cylindrical ends. The adjuster includes a bracket coupled to the intermediate portion of the support bar, a pivot arm selectively pivotable about the cylindrical end of the support bar, and an adjustment mechanism coupled between the bracket and the pivot arm. The adjustment mechanism pivots the support bar relative to the pivot arm to thereby tilt the pickup heads.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates generally to a sheet feeder apparatus. More specifically, the present invention relates to a feeder mechanism for a sheet feeder apparatus having adjustable pickup heads.

BACKGROUND OF THE INVENTION

A sheet feeder apparatus is a device that holds a stack of paper, cardstock, and the like, and feeds each sheet into a printer, printing press, or similar device one sheet at a time. In a sheet feeder apparatus, a feeder mechanism is typically implemented to lift a single sheet of material from the top of a stack of sheets of like material. Suction cups are widely utilized in feeder mechanisms for picking up the sheets of material. Typically, the lip of the suction cup is driven into contact with the surface of the sheet. Suction or a partial vacuum inside the suction cup causes ambient air pressure to force the cup against the contact surface and so hold it by friction against the lip.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete understanding of the present invention may be derived by referring to the detailed description and claims when considered in connection with the Figures, wherein like reference numbers refer to similar items throughout the Figures, and:

FIG. 1 shows a back perspective view of a sheet feeder apparatus;

FIG. 2 shows a partial front perspective view of the sheet feeder apparatus that includes a feeder mechanism in accordance with an embodiment;

FIG. 3 shows an enlarged partial front perspective view for the feeder mechanism;

FIG. 4 shows a perspective view of a support bar for the feeder mechanism;

FIG. 5 shows a side view of a pickup head for the feeder mechanism;

FIG. 6 shows a side view of a bracket component of an adjuster for the feeder mechanism;

FIG. 7 shows a side view of a pivot arm component of the adjuster;

FIG. 8 shows a side view of a fastener component of an adjustment mechanism for the adjuster;

FIG. 9 shows a side view of the pickup head and the adjuster mounted on the support bar of the feeder mechanism in which the pickup head is oriented in a vertical position;

FIG. 10 shows a side view of the pickup head and adjuster mounted on the support bar of the feeder mechanism in which the pickup head is tilted in a sheet transport direction; and

FIG. 11 shows a side view of the pickup head and adjuster mounted on the support bar of the feeder mechanism in which the pickup head is tilted in a direction that is opposite to the sheet transport direction.

DETAILED DESCRIPTION

Sheet feeder apparatuses are used to pick up a variety of materials having different thicknesses, stiffness, sheet sizes, material quality and so forth. In some instances, it may be necessary to adjust positions of the pickup heads of a feeder mechanism for particular working conditions and/or types of material. With particular regard to stiff paper, such as cardstock, a typical stack of sheets may be curved upwardly or downwardly at its leading edge. As such, when the suction cups of vertically oriented pickup heads of a feeder mechanism are lowered to this curved surface, incomplete contact between the suction cups and the stack of curved sheets can occur causing an air leak between the lip of the suction cup and the topmost sheet. Accordingly, sufficient suction may not be formed and the sheet material may not be effectively held by friction against the lip of the suction cup. If the sheet material is not effectively held by the suction cups, feed-failure jams, overlapped feeding, and/or a number of other problems can occur. The term “feed-failure jam” refers to a condition in which a sheet of material is not well fed but stopped on the feeding path, which can lead to further complications. The term “overlapped feeding” refers to the condition in which more than one sheet is fed together, with a part of one sheet overlapped by a part of another sheet.
Embodiments disclosed herein entail a feeder mechanism in a sheet feeder apparatus for picking up sheets of a material from a stack of sheets. The feeder mechanism includes suction pickup heads that can be collectively adjusted, or tilted, in a sheet transport direction to accommodate curvature in the stack of sheets. Additionally, the suction pickup heads can be individually adjusted in a lateral direction perpendicular to the sheet transport direction to accommodate varying widths of the sheet material. The various adjustments can be readily accomplished on the fly in accordance with changing materials and conditions. Moreover, the feeder mechanism may be implemented on a variety of sheet feeder apparatuses without undue modification to the apparatuses.
FIG. 1 shows a back perspective view of a sheet feeder apparatus 20. Sheet feeder apparatus 20 may be used to individually supply sheets of a material from a stack of sheets 22 to a downstream machine (not shown) such as a printer, printing press, or similar device. For clarity, the topmost sheet from stack of sheets 22 is referred to herein as sheet 24. Accordingly, sheet 24 is picked up by a feeder mechanism (discussed below) and is transported in a sheet transport direction 26 onto a transport table 27 leading to the downstream machine.
Referring to FIGS. 2 and 3, FIG. 2 shows a partial front perspective view of sheet feeder apparatus 20 that includes a feeder mechanism 28 in accordance with an embodiment, and FIG. 3 shows an enlarged partial front perspective view of feeder mechanism 28. Feeder mechanism 28 is generally configured to pick up the topmost sheet 24 from stack of sheets 22 (FIG. 1). Feeder mechanism 20 includes a support bar 30. Feeder mechanism 20 further includes one or more pickup heads 32 suspended below support bar 30, and an adjuster 34 coupled to support bar 30.
Feeder mechanism 28 is shown and described herein as being coupled with sheet feeder apparatus 20 for illustrative purposes. However, the elements of feeder mechanism 28 such as support bar 30, pickup heads 32, and adjuster 34 may be readily adapted for incorporation into other sheet feeder designs.
In an illustrative example, sheet feeder apparatus 20 may include two sets of control arms 36, each of which are located at opposing ends of pivot and forward control shafts 38 and 40, respectively. Each set of control arms 36 can include a first control arm 42 and a second control arm 44. Opposing ends of support bar 30 are constrained by, i.e., held by, first control arm 42. In general, pivot and forward control shafts 38 and 40, along with first and second control arms 42 and 44, function cooperatively to drive feeder mechanism 28 upwardly and downwardly, as well as forward and backward. That is, the opposing ends of support bar 30 reside in a frame cutout 46 (shown in FIG. 3) of sheet feeder apparatus 20, and a bearing (not shown) residing in frame cutout 46 allows constrained relative motion of support bar 30 in an up/down direction, represented by an arrow 48 in FIG. 3, and in a forward/backward direction, represented by an arrow 50 in FIG. 3. This constrained relative motion causes pickup heads 32 to be driven into contact with each successive sheet 24 in stack of sheets 22 (FIG. 1).
Support bar 30 is configured to pivotally couple to first control arms 42 of sheet feeder apparatus 20. In an example, the ends of support bar 30 are directed through apertures (not visible) in each of first control arms 42 and connect to drive elements (not shown) of sheet feeder apparatus 20 in a known manner. Accordingly, a longitudinal axis 52 of support bar 30 is arranged substantially perpendicular to sheet transport direction 26 of sheet feeder apparatus 20. As will be discussed in much greater detail below, support bar 30 can pivot about its longitudinal axis 52, where the degree of pivoting is controlled by adjuster 34. The pivot motion is represented by a curved, bi-directional arrow 54 in FIGS. 2 and 3. Pivot motion 54 of support arm 30 causes pickup heads 32 coupled to support arm 30 to tilt in a plane extending substantially vertically (i.e., up/down) and in sheet transport direction 26.
The materials to be fed by sheet feeder apparatus 20 can come in various widths. Accordingly, pickup heads 32 may also be suitably adjusted in accordance with a width dimension 56 of sheet 24 in order to accommodate various widths of sheet 24. That is, pickup heads 32 are additionally lengthwise displaceable along support bar 30, where this lengthwise motion is represented by a straight bi-directional arrow 58, as will be discussed in greater detail below.
Referring to FIG. 4 in connection with FIG. 3, FIG. 4 shows a perspective view of support bar 30 of feeder mechanism 28. Support bar 30 includes a first end 60, a second end 62, and an intermediate portion 64 extending between first and second ends 60 and 62, respectively. At least one, and in this example, both of first and second ends 60 and 62 is cylindrical in shape. In contrast, intermediate portion 64 has a generally rectangular, and more specifically square, cross-section.
In some embodiments, the cylindrical first and second ends 60 and 62 may be threaded onto or otherwise attached to the rectangular intermediate portion 64. However, in other embodiments, the cylindrical first and second ends 60 and 62 may be formed from a contiguous piece of machined metal. Intermediate portion 64 is illustrated as being discontinuous so that first and second cylindrical ends 60 and 62 and the rectangular cross-section of intermediate portion 64 can be readily visualized. It should be readily apparent, however, that support bar 30 does not include a discontinuous region, as shown in FIG. 2.
Referring to FIG. 5 in connection with FIG. 3, FIG. 5 shows a side view of one of pickup heads 32 of feeder mechanism 28. Although only one pickup head 32 is described in detail, it should be understood that the following discussion applies equally to each of pickup heads 32 coupled to support bar 30 of feeder mechanism 28. Pickup head 32 includes a block element 66, a suction tube 68 extending through block element 66, and a resilient suction cup 70 coupled to a distal end of suction tube 68. In an embodiment, suction tube 68 may be able to move or slide within block element 66. Accordingly, pickup head 32 may further include a spring 72 residing on suction tube 68 between block element 66 and suction cup 70. Spring 72 urges suction cup 70 away from block element 66, but compresses as needed when suction cup 70 is driven into contact with sheet 24 (FIG. 2).
Suction tube 68 is coupled to a vacuum hose 74, which in turn goes to a conventional suction source (not shown). Accordingly, a hollow space 76 (shown in dashed line form in FIG. 5) circumscribed by the outer perimeter, i.e., a lip 78, of suction cup 70 is thus coupled to the suction source. Vacuum hose 74 may be flexible to allow for the motion of feeder mechanism 28 relative to sheet feeder apparatus 20. Generally vacuum is applied via the suction source when pickup heads 32 of feeder mechanism 28 are driven in contact with the topmost sheet 24 in stack of sheets 22 (FIG. 1). The vacuum is released when feeder mechanism 28 has moved sheet 24 onto transport table 27 (FIG. 1).
A passage 80 extends through block element 66. Passage 80 is generally rectangular so as to match the generally rectangular cross-sectional shape of intermediate portion 64 of support bar 30. In addition, passage 80 is slightly larger than the cross-sectional dimensions of intermediate portion 64 so that block element 66 can slide relatively freely lengthwise along intermediate portion 64. However, passage 80 is small enough so that block element 66 cannot rotate about intermediate portion 64.
Pickup head 32 further includes a fastener element 82 having a shank 84 in threaded engagement with block element 66. Shank 84 is configured to extend at least slightly into passage 80. Fastener element 82 further includes a knob 86 coupled to shank 84. In operation, a user can turn fastener element 82 to move shank 84 out of passage 80 so that block element 66 can be slid along intermediate portion 64 of support bar 30 to a desired position. Once pickup head 32 is appropriately located, the user can turn fastener element 82 using knob 86 to move shank 84 into abutment with intermediate portion 64 so that pickup head 32 is secured in place. Accordingly, each of pickup heads 32 can be individually lengthwise displaced along intermediate portion 64 and then secured in non-pivotable engagement with support bar 30.
Referring now to FIGS. 6-8 in connection with FIG. 3, FIG. 6 shows a side view of a bracket component 88 of adjuster 34 for feeder mechanism 28, FIG. 7 shows a side view of a pivot arm component 90 of adjuster 34, and FIG. 8 shows a side view of a fastener component 92 of an adjustment mechanism for adjuster 34. In general, bracket 88, pivot arm 90, and fastener 92 are operably coupled to support bar 30 and function to pivot support bar 30 and, consequently, to tilt pickup heads 32 that are secured to support bar 30.
With particular reference to FIGS. 3 and 6, bracket 88 is fixedly coupled to intermediate portion 64 of support bar 30. To that end, a passage 94 extends through bracket 88. Passage 94 is generally rectangular so as to match the generally rectangular cross-sectional shape of intermediate portion 64 of support bar 30. In addition, passage 94 is small enough so that bracket 88 cannot rotate about intermediate portion 64. In one exemplary configuration, passage 94 may be sized such that intermediate portion 64 is press fit into passage 94 to fix bracket 88 to intermediate portion 64 of support bar 30. In another exemplary configuration, bracket 88 may have a gap 96 extending between an outer edge of bracket 88 and passage 94. Gap 96 allows for slight displacement of opposing edges 98, 100 of bracket 88 at gap 96 so that intermediate portion 64 can be slid into passage 94. Once bracket 88 is suitably positioned on intermediate portion 64, a threaded fastener (not shown) may be screwed into a corresponding threaded passage in bracket 88 (represented by dashed lines) so as to close gap 96 and thereby fix bracket 88 to intermediate portion 64 of support bar 30. Those skilled in the art will recognize that alternative designs may be implemented for fixedly coupling bracket 88 to the rectangular shaped intermediate portion 64.
With particular reference to FIGS. 3 and 7, pivot arm 90 is coupled to the cylindrical first end 60 (FIG. 4) of support bar 30. To that end, a passage 102 extends through bracket pivot arm 90. Passage 102 is generally circular so as to match the generally circular cross-sectional shape of first end 60 of support bar 30. In addition, passage 102 is slightly larger than the diameter of first end 60 so that support arm 30 can pivot inside of and relative to passage 102.
Now with particular reference to FIGS. 3 and 8, an adjustment mechanism 104 of adjuster 34 is coupled between bracket 88 and pivot arm 90. Adjustment mechanism 104 includes a post 106 (visible in FIG. 3) and fastener 92. Adjustment mechanism 104 is adapted to cause support bar 30 to pivot, or rotate, relative to pivot arm 90 and thereby tilt pickup heads 32. Post 106 is in fixed engagement with pivot arm 90. For example, post 106 may be a separate component that is attached to pivot arm 90 via a threaded fastener 108, the head of which is visible in FIG. 7. Alternatively, pivot arm 90 and post 106 may be machined as a single integral component. As most clearly seen in FIG. 3, post 106 is displaced away from and aligned substantially parallel to support bar 30.
Fastener 92 is engaged with each of bracket 88 and post 106, and is oriented substantially perpendicular to support bar 30. In an embodiment, fastener 92 includes a threaded shank 110 attached to an adjustment knob 112. At least one of bracket 88 and post 106 includes a corresponding threaded opening. For example, post 106 includes a threaded opening 114 (see FIG. 3). Fastener 92 is directed through a passage 116 (see FIG. 3) in bracket 88, and is threaded into threaded opening 114. A spring element 118 resides on threaded shank 110 of fastener 92 and is interposed between bracket 88 and post 106.
In operation, manual rotation of fastener 92 in a first direction, e.g., clockwise, via adjustment knob 112 draws bracket 88 toward post 106. Movement of bracket 88 toward post 106 causes the corresponding rotation of support arm 30 relative to pivot arm 90 due to the fixed engagement of bracket 88 with support arm 30. As support arm 30 pivots, all of pickup heads 32 coupled to support arm 30 will concurrently tilt in a predetermined direction. Similarly, manual rotation of fastener 92 in a direction opposite, e.g., counterclockwise, to the first direction via adjustment knob 112 urges bracket 88 away from post 106. Movement of bracket 88 away from post 106 causes corresponding rotation of support arm 30 relative to pivot arm 90, and the subsequent tilting of pickup heads 32 in the opposite direction. Spring element 118 urges bracket 88 away from post 106. However, spring element 118 compresses as needed when fastener 92 is manually rotated.
FIG. 9 shows a side view of one of pickup heads 32 and adjuster 34 mounted on support bar 30 of feeder mechanism 28. In this exemplary illustration, pickup head 32 is not tilted, but rather, is oriented in a vertical position. Although the function of only one pickup head 32 is described in connection with FIGS. 9 through 11 below, it should be readily understood that that the ensuing descriptions apply equally to all pickup heads 32 of feeder mechanism 28.
As shown, stack of sheets 22 underlying suction cup 70 is generally flat, i.e., not curved. As such, pickup head 32 is suitably positioned vertically so that as pickup head 32 is moved in downwardly in accordance with up/down motion 48 of control arms 36 (FIG. 3), suction cup 70 of pickup head 32 is driven into contact with each successive sheet 24 in stack of sheets 22. In this scenario in which stack of sheets 22 is substantially flat, the vertical orientation of pickup head 32 enables generally complete contact between suction cup 70 and the topmost sheet 24. Thus, an air leak between suction cup 70 and sheet 24 is less likely to occur so that sufficient suction can be formed to hold sheet 24 against lip 78 of suction cup 70 while sheet 24 is being moved in sheet transport direction 26.
FIG. 10 shows a side view of one of pickup heads 32 and adjuster 34 mounted on support bar 30 of feeder mechanism 28. In this exemplary illustration, pickup head 32 is tilted in sheet transport direction 26. As shown, a leading edge of stack of sheets 22 underlying suction cup 70 of pickup head 32 is generally upwardly curved. This curvature can be especially prevalent when stack of sheets 22 is of relatively stiff stock material. Thus, pickup head 32 is currently tilted away from the vertical orientation at a tilt angle 120 in sheet transport direction 26 to align with the curvature in stack of sheets 22. In order to do so, adjustment knob 112 is turned in a clockwise direction 122 to rotate threaded fastener 92. Adjustment knob 112 may be readily manually turned by an operator of sheet feeder apparatus 20 (FIG. 1) in order to accommodate the curvature of a stack of sheets 22.
Rotation of fastener 92 in clockwise direction 122 draws bracket 88 toward post 106 (FIG. 3) coupled to pivot arm 90. As bracket 88 is drawn toward post 106, support bar 30 rotates in passage 102 extending through pivot arm 90 due to the fixed coupling of bracket 88 to intermediate portion 64 (FIG. 4) of support bar 30. Pickup head 32 tilts in sheet transport direction 26 corresponding with the rotation of support bar 30. That is, bracket 88, support bar 30, and pickup head 32 are jointly movable in contrast to a generally non-movable pivot arm 90.
Pickup head 32 is tilted to suitably align with the curvature of stack of sheets 22. Accordingly, as pickup head 32 is moved downwardly in accordance with up/down motion 48 of control arms 36 (FIG. 3), suction cup 70 of pickup head 32 is driven into contact with each successive sheet 24 in stack of sheets 22. In this scenario in which the leading edge of stack of sheets 22 is upwardly curved, tilt angle 120 of pickup head 32 in sheet transport direction 26 enables generally complete contact between suction cup 70 and the topmost sheet 24. Thus, an air leak between suction cup 70 and sheet 24 is less likely to occur so that sufficient suction can be formed to hold sheet 24 against lip 78 of suction cup 70 while sheet 24 is being moved in sheet transport direction 26.
FIG. 11 shows a side view of one of pickup heads 32 and adjuster 34 mounted on support bar 30 of feeder mechanism 28. In this exemplary illustration, pickup head 32 is tilted in a direction opposite to sheet transport direction 26. As shown, a leading edge of stack of sheets 22 underlying suction cup 70 of pickup head 32 is generally downwardly curved. Thus, pickup head 32 is currently tilted away from the vertical orientation at a tilt angle 124 in a direction opposite from sheet transport direction 26 so as to align with the downward curvature in stack of sheets 22. In order to do so, adjustment knob 112 is manually turned in a counterclockwise direction 126 to rotate threaded fastener 92 in order to accommodate the curvature of a stack of sheets 22.
Rotation of fastener 92 in counterclockwise direction 126 urges bracket 88 away from post 106 (FIG. 3) coupled to pivot arm 90. As bracket 88 is urged away from post 106, support bar 30 rotates in passage 102 extending through pivot arm 90 due to the fixed coupling of bracket 88 to intermediate portion 64 (FIG. 4) of support bar 30. Pickup head 32 tilts opposite to sheet transport direction 26 corresponding with the rotation of support bar 30 to best align with the curvature of stack of sheets 22.
Accordingly, as pickup head 32 is moved downwardly in accordance with up/down motion 48 of control arms 36 (FIG. 3), suction cup 70 of pickup head 32 is driven into contact with each successive sheet 24 in stack of sheets 22. In this scenario in which the leading edge of stack of sheets 22 is downwardly curved, tilt angle 124 of pickup head 32 opposite from sheet transport direction 26 enables generally complete contact between suction cup 70 and the topmost sheet 24. Thus, an air leak between suction cup 70 and sheet 24 is less likely to occur so that sufficient suction can be formed to hold sheet 24 against lip 78 of suction cup 70 while sheet 24 is being moved in sheet transport direction 26.
In summary, embodiments of the invention entail a feeder mechanism in a sheet feeder apparatus for picking up sheets of a material from a stack of sheets. The feeder mechanism includes suction pickup heads that can be collectively adjusted, or tilted, forwardly or backwardly in a plane parallel to a sheet transport direction of the sheet feeder apparatus in order to accommodate curvature in the stack of sheets. Additionally, the suction pickup heads can be individually adjusted in a lateral direction perpendicular to the sheet transport direction to accommodate varying widths of the sheet material. The various adjustments can be manually accomplished by an operator on the fly in accordance with changing materials and conditions. Moreover, the feeder mechanism may be implemented on a variety of sheet feeder apparatuses without undue modification to the apparatuses.
Although the preferred embodiments of the invention have been illustrated and described in detail, it will be readily apparent to those skilled in the art that various modifications may be made therein without departing from the spirit of the invention or from the scope of the appended claims. That is, it should be appreciated that the exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention.

Claims

1. In a sheet feeder apparatus, a feeder mechanism for picking up sheets from a stack of sheets comprising:

a support bar configured to pivotally couple to control arms of said sheet feeder apparatus, said support bar including a first end, a second end, and an intermediate portion between said first and second ends, at least one of said first and second ends being a cylindrical end;

a pickup head coupled to said support bar at said intermediate portion; and

an adjuster coupled to said support bar at said cylindrical end, said adjuster being configured to pivot said support bar to tilt said pickup head; wherein said adjuster comprises:

a bracket fixedly coupled to said intermediate portion of said support bar;

a pivot arm coupled to said cylindrical end of said support bar, said pivot arm being selectively pivotable about said cylindrical end of said support bar; and

an adjustment mechanism coupled between said bracket and said pivot arm and adapted to pivot said support bar relative to said pivot arm and thereby tilt said pickup head, said adjustment mechanism including a post and a fastener, said post being in fixed engagement with said pivot arm, said post being displaced away from and aligned substantially parallel to said support bar, said fastener being engaged with each of said bracket and said post, and said fastener being oriented substantially perpendicular to said support bar, wherein one of said bracket and said post includes a threaded opening, said fastener is a threaded fastener that extends through said threaded opening, and rotation of said threaded fastener in a first direction draws said bracket toward said post to cause said pickup head to tilt in a sheet transport direction of said sheet feeder apparatus, and rotation of said threaded fastener in a direction opposite to said first direction urges said bracket away from said post to cause said pickup head to tilt in a direction opposite to said sheet transport direction.

2. A feeder mechanism as claimed in claim 1 wherein:

a longitudinal axis of said support bar is arranged perpendicular to a sheet transport direction of said sheet feeder apparatus;

said pickup head is suspended below said support bar and configured to be driven into contact with successive ones of said sheets; and

said adjuster pivots said support bar about said longitudinal axis to selectively tilt said pickup head in a plane extending substantially vertically and in said sheet transport direction.

3-5. (canceled)

6. A feeder mechanism as claimed in claim 1 wherein said threaded fastener includes an adjustment knob for manual rotation of said threaded fastener.

7. In a sheet feeder apparatus, a feeder mechanism for picking up sheets from a stack of sheets comprising:

a pickup head coupled to said support bar at said intermediate portion; and

an adjuster coupled to said support bar at said cylindrical end, said adjuster being configured to pivot said support bar to tilt said pickup head wherein said adjuster comprises:

a bracket fixedly coupled to said intermediate portion of said support bar;

an adjustment mechanism coupled between said bracket and said pivot arm and adapted to pivot said support bar relative to said pivot arm and thereby tilt said pickup head, wherein said adjustment mechanism includes a post, a fastener, and a spring element, said post being in fixed engagement with said pivot arm, said post being displaced away from and aligned substantially parallel to said support bar, said fastener being engaged with each of said bracket and said post, said fastener being oriented substantially perpendicular to said support bar, and said spring element residing on said fastener and interposed between said bracket and said post.

8. A feeder mechanism as claimed in claim 1 further comprising multiple pickup heads coupled to said support bar at said intermediate portion, said pickup head being one of said multiple pickup heads, wherein pivoting said support bar concurrently tilts each of said pickup heads.

9. A feeder mechanism as claimed in claim 1 wherein said pickup head is in non-pivotable engagement with said support bar.

10. A feeder mechanism as claimed in claim 1 wherein said intermediate portion of said support bar has a generally rectangular cross section.

11. A feeder mechanism as claimed in claim 1 wherein said pickup head is lengthwise displaceable along said support bar.

12. A feeder mechanism as claimed in claim 1 further comprising multiple pickup heads coupled to said support bar at said intermediate portion, said pickup head being one of said multiple pickup heads, and each of said multiple pickup heads being individually lengthwise displaceable along said support bar.

13-18. (canceled)

19. In a sheet feeder apparatus, a feeder mechanism for picking up sheets from a stack of sheets comprising:

multiple pickup heads coupled to said support bar at said intermediate portion; and

an adjuster coupled to said support bar at said cylindrical end, said adjuster being configured to pivot said support bar to concurrently tilt each of said pickup heads, said adjuster including:

a bracket fixedly coupled to said intermediate portion of said support bar;

an adjustment mechanism coupled between said bracket and said pivot arm and adapted to pivot said support bar relative to said pivot arm and thereby tilt said each of said pickup heads, said adjustment mechanism including a post and a fastener, said post being in fixed engagement with said pivot arm, said post being displaced away from and aligned substantially parallel to said support bar, said fastener being engaged with each of said bracket and said post, and said fastener being oriented substantially perpendicular said support bar; wherein one of said bracket and said post includes a threaded opening, said fastener is a threaded fastener that extends through said threaded opening, and rotation of said threaded fastener in a first direction draws said bracket toward said post to cause said each of said pickup heads to tilt in a sheet transport direction of said sheet feeder apparatus, and rotation of said threaded fastener in a direction opposite to said first direction urges said bracket away from said post to cause said pickup head to tilt in a direction opposite to said sheet transport direction.

20. (canceled)