Patent Application
20090096157
A wide variety of friction sheet feeding machines are available for feeding individual sheets from the bottom of an essentially vertical stack of sheets. Exemplary friction sheet feeding machines are shown and described in U.S. Pat. Nos. 4,991,831, 5,143,365, 5,244,198, 5,642,877, 5,772,199 and 6,932,338.
These machines typically include (i) a tray for holding a stack of sheets in an essentially vertical position, (ii) a nip for feeding a lowermost sheet from the stack, (iii) a driven friction roller or feed belt for contacting the downward facing major surface of the lowermost sheet in the stack and pulling the lowermost sheet from underneath the sheet stack towards the nip, and (iv) a friction retard surface positioned above the driven friction roller for contacting the leading edge(s) and any exposed upward facing major surface(s) of the sheet(s) positioned directly above the lowermost sheet for retarding advancement of the sheet(s) directly above the lowermost sheet and thereby facilitating separation of the lowermost sheet from the immediately overlying sheet prior to introduction of the lowermost sheet into the feed nip.
Side guides are commonly employed on friction sheet feeding machines for providing lateral support to a sheet stack loaded onto the tray, and providing lateral guidance to sheets as they are pulled from the stack by the driven friction roller or feed belt(s) and introduced into the nip area. These side guides are commonly mounted on a laterally repositionable carriage to permit quick and easy repositioning of the side guides in order to accommodate sheets of different widths. However, because the side guides typically extend below the upper conveying surface of the feed belts in order to prevent sheets from slipping under the side guide, the feed belts often interfere with lateral repositioning of the side guides. Hence, the side guides need to be detached from the carriage prior to repositioning of the subassembly and reattached after the carriage has been repositioned.
While generally effective for facilitating lateral repositioning of the side guides, the repositioning process tends to be an awkward, cumbersome, time consuming and potentially dangerous as it involves detachment and reattachment of the side guides.
Accordingly, a need exists for laterally repositionable side guides capable of being quickly, easily and safely repositioned without requiring the use of a tool or requiring detachment of the side guides.
A first aspect of the invention is a laterally repositionable side guide assembly for use with a friction sheet feeding machine. The side guide assembly includes (i) a support member, (ii) a carriage, (iii) a side guide, and (iv) a worm screw. The support member is configured and arranged for attachment to a friction sheet feeding machine. The carriage is repositionably mounted on the support member for selective lateral repositioning relative to the support member. The side guide is configured and arranged for laterally guiding sheets through a friction sheet feeding machine. The side guide is attached to the carriage for lateral repositioning with the carriage. The worm screw is in threaded communication with the carriage for effecting linear movement of the carriage along the length of the worm screw upon rotation of the worm screw.
The side guide assembly preferably includes a pair of laterally spaced and laterally repositionable carriages, each with an associated side guide and a corresponding worm screw.
A second aspect of the invention is a method of laterally repositioning a side guide on a friction sheet feeding machine. The method includes the steps of (i) obtaining a friction sheet feeding machine equipped with a repositionable side guide assembly wherein the side guide assembly includes at least (A) a support member attached to the friction sheet feeding machine, (B) a pair of laterally spaced carriage, each repositionably mounted on the support member for selective lateral repositioning relative to the support member, (C) a pair of laterally spaced side guides, each configured and arranged for laterally guiding sheets through the friction sheet feeding machine, and each attached to one of the carriages for lateral repositioning with the carriage, and (D) a pair of laterally spaced worm screws, each in threaded communication with one of the carriages for effecting linear movement of the corresponding carriage along the length of the worm screw upon rotation of the worm screw, (ii) rotating one of the worm screws to laterally reposition the corresponding carriage and attached side guide along the support member without lateral movement of the one worm screw, and (iii) rotating the other worm screw to laterally reposition the corresponding carriage and attached side guide along the support member without lateral movement of the other worm screw.
Friction sheet feeding machines 10 generally include a frame (not shown), a tray assembly (not shown), a gating assembly (not shown) and a drive assembly 30. The machines 10 are capable of serially feeding individual sheets (not shown) in a longitudinal direction x from the bottom (not shown) of a generally vertical stack of sheets (not shown) retained within the tray assembly (not shown).
A typical configuration of the frame (unnumbered) is a generally rectangular frame (not shown) having (i) a generally horizontal base plate (not shown), (ii) a right side panel (not shown) extending upward from the base plate (not shown), (iii) a left side panel (not shown) also extending upward from the base plate (not shown), (iv) a rear end plate (not shown) extending upward from the base plate (not shown) and laterally interconnecting the side panels (not shown), (v) at least one lateral cross member, such as cross member 20, transversely spaced above the base plate (not shown) and interconnecting the side panels (not shown) for supporting the gating assembly (not shown), and (vi) a plurality of laterally extending support rods (not shown) extending between and interconnecting the side panels (not shown). Other frame configurations may also be employed, such as a cross-beam construction rather than a plate construction. Exemplary frames suitable for use are shown and described in U.S. Pat. Nos. 4,991,831, 5,143,365, 5,244,198, 5,642,877, 5,772,199 and 6,932,338.
The tray assembly (not shown) is effective for holding a stack of individual sheets (not shown) in a substantially vertical position with a slight biasing of at least the lower portion (unnumbered) of the stack (not shown) towards the gating assembly (not shown) and the drive assembly 30.
One means for achieving the desired biasing of the stack (not shown), is to incline the floor (not shown) of the tray assembly (not shown) towards the gating assembly (not shown) and the drive assembly 30. Other means are known and may also be employed, such as a transversely extending strip (not shown) positioned within the tray assembly (not shown) for supporting the trailing edges (not shown) of the sheets (not shown) in the stack (not shown) wherein the lower portion (unnumbered) of the support strip (not shown) is curved towards the gating assembly (not shown) and the drive assembly 30. Suitable tray types, styles and configurations are shown and described in U.S. Pat. Nos. 4,991,831, 5,143,365, 5,244,198, 5,642,877, 5,772,199 and 6,932,338.
A typical gating assembly (not shown) includes a friction retard roller (not shown) driven by an auxiliary electric motor (not shown) for contacting the upward facing major surface (not shown) of sheets (not shown) as they approach the friction feed belts 35 for assisting in separation of a lowermost sheet (not shown) from the immediately overlying sheet (not shown) and preventing the simultaneous feeding of multiple sheets (not shown). Typical gating assemblies are shown and described in U.S. Pat. Nos. 4,991,831, 5,143,365, 5,244,198, 5,642,877, 5,772,199 and 6,932,338.
Generally, the drive assembly 30 includes a primary drive motor (not shown) and a friction feed roller 31 driven by the primary drive motor (not shown). The friction feed roller 31 drives friction feed belts 35 which contact the sheets (not shown).
The drive assembly 30 on friction sheet feeding machines 10 typically includes a conveyor system (not shown) downstream from the friction feed belts 35 for receiving individual sheets (not shown) fed from the sheet stack (not shown) by the friction feed belts 35 and conveying the fed sheets (not shown) to the desired location, typically a conveyor belt (not shown) timed to receive and collate sheets (not shown) fed from several aligned friction sheet feeding machines 10.
Referring generally to
Referring generally to
The side guide assembly 100 includes a support rod 110, right and left carriages 120r and 120s (collectively carriages 120), and right and left side guides 190r and 190s (collectively side guides 190).
The support rod 110 is positioned just above the cross member 20 with the lateral ends (unnumbered) of the support rod 110 attached to the lateral y ends (unnumbered) of the cross member 20 by first mounting blocks 161 and machine screws 163.
The carriages 120 are slidably supported on the support rod 110 via a first lateral y bore 129a through each carriage 120. The carriages 120 are also slidably supported on the cross member 20 via a lateral y channel 127 in the front 123 of each carriage 120.
The right and left side guides 190r and 190s are mounted onto the right and left carriages 120r and 120s respectively. The side guides 190 are configured and arranged to cooperatively support a stack of sheets (not shown) therebetween.
The carriages 120 each have a second lateral bore 129b extending through the carriage 120. A right worm screw 140r extends through the second lateral bore 129b in the right carriage 120r and a left worm screw 140s extends through the second lateral bore 129b in the left carriage 120s. The worm screws 140r and 140s (collectively 140) are spirally threaded for cooperatively engaging a follower pin 131 extending into the second lateral bore 129b in each carriage 120, whereby rotation of the worm screw 140 causes the corresponding carriage 120 to travel along the length of the rotated worm screw 140.
The distal ends 142 of the worm screws 140 are rotatably supported by a center support block 150 attached to the cross member 20 by machine screws 153.
The proximal ends 141 of each worm screw 140r and 140s is attached to a repositioning knob 170r and 170s respectively (collectively repositioning knobs 170) for effecting independent manual rotation of the attached worm screw 140. The repositioning knobs 170 are rotatably supported by second mounting blocks 162 attached to the cross member 20 by machine screws 164.
A locking knob 180r and 180s (collectively 180) is provided on each carriage 120r and 120s respectively, for selectively engaging and disengaging the support rod 110 to prevent further lateral repositioning of the corresponding carriage 120 when the locking knob 180 is rotated into locking engagement with the support member 110, and permitting repositioning of the corresponding carriage 120 when the locking knob 180 is rotated away from the support member 110.
Bearings (unnumbered) are preferably provided at each end (unnumbered) of the first bores 129a through each carriage 120 to facilitate lateral y sliding of the carriages 120 along the support rod 110. Bearings (unnumbered) are also preferably provided at each end (unnumbered) of the second bores 129b through each carriage 120 to facilitate rotation and lateral y sliding of the worm screws 140 relative to the carriages 120.
An e-clip 145 can be provided on each worm screw 140 proximate the distal end 142 of the worm screw 140 for serving as a stop to continued inward travel of the carriages 120 along the length of the corresponding worm screw 140. Other mechanical stops are well known to those of routine skill in the art and may be substituted for the e-clip stop 145 shown and described.
Referring to
The side guides 190 are mounted to a corresponding carriage 120 so that they travel laterally y with the corresponding carriage 120, and a capable of being transversely z lifted relative to the carriage 120 during repositioning of the side guide 190 without being detached from the carriage 120.
One mechanism for achieving the desired attachment is depicted in
Other attachment mechanisms capable of coupling the side guide 190 to a corresponding carriage 120 with the necessary and desired upward sliding or pivoting of the side guide 190 relative to the corresponding carriage 120 without detaching the side guide 190 from the carriage 120, are known and within the scope of this invention. One such example is to replace the catch pins 132 on the carriage 120 with an L-shaped slot 199 and replace the slots 199 on the side guide 190 with trunnions (not shown).
Biasing means other than gravity are known and may be employed to bias the side guides 190 into the lower “locked” position on the corresponding carriage 120. Such biasing means include springs, elastic bands, pneumatic cylinders, etc.
The side guide assembly 100 of the present invention permits quick and easy repositioning of the side guides 190 as necessary for accommodating sheets (not shown) of different width by (i) rotating the locking knob 180 to allow the carriage 120 to slide along the support rod 120, (ii) pulling up on the side guide 190 to position the side guide 190 into the upper position and thereby lift the bottom 192 of the side guide 190 above the friction feed belts 35, (iii) rotating the repositioning knob 170 as necessary and appropriate to move the carriage 120 and attached side guide 190 into supporting engagement with sheets (not shown) loaded onto the friction sheet feeding machine 10 with the side guide held in the lifted position, (iv) releasing the side guide 190 so as to allow the side guide 190 to return to its lower biased position, (v) rotating the locking knob 180 to again lock the carriage 120 against the support rod 110 and prevent any further lateral y movement of the carriage 120 and the corresponding side guide 190 relative to the friction sheet feeding machine 10, and (vi) repeating steps (i) through (v) for the other side guide 190.
This application claims the benefit of U.S. Provisional Application No. 60/784,121, filed Mar. 20, 2006.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US2007/064350 | 3/20/2007 | WO | 00 | 9/16/2008 |
| Number | Date | Country | |
|---|---|---|---|
| 60784121 | Mar 2006 | US |
