Rotary scrap stripper

• US 5,365,815 A
• Filed: 12/13/1993
• Issued: 11/22/1994
• Est. Priority Date: 01/12/1993
• Status: Expired due to Fees

• Current Assignee: Bernal, Inc.
• Original Assignee: Alan R. Pfaff Jr
• Inventors: Pfaff, Alan R. Jr.
• Primary Examiner(s): Rada, Rinaldi I.
• Assistant Examiner(s): Peterson, Kenneth E.
• Application Number:
  US08/166,606
• Time in Patent Office: 344 Days
• Field of Search: 83/107, 83/151, 83/154, 83/128, 83/345, 493/342, 493/373, 493/472
• US Class Current: 83/154
• CPC Class Codes: B26D 2007/1872 using breakaway pins
• CPC Class Codes: B26D 7/1818 by pushing out
• CPC Class Codes: B26D 7/1836 by pulling out
• CPC Class Codes: Y10T 83/2133 By resiliently biased ejector
• CPC Class Codes: Y10T 83/219 Rotating or oscillating product handler
• CPC Class Codes: Y10T 83/4836 With radial overlap of the cutting members

Abstract

A piece of scrap material cut from a web passing through the nip of a pair of rotary cutting dies is removed by a mechanism with an actuator carried by one of the cylinders, a pin and ejector sleeve carried by the other cylinder and a release roller downstream of the nip and adjacent the other cylinder. As the scrap piece is cut from the web it is impaled on the pin by cooperation with the actuator which also retracts the sleeve to expose the pin and actuates an indexable ring to releasably retain the sleeve in a retracted position from the head of pin. The scrap piece is impaled on the pin and is carried away from the nip and web by rotation of the other cylinder and downstream thereof passes through the nip of a roller and the other cylinder which moves the sleeve and actuates the ring to release the sleeve so that as it passes out of the nip it moves to the fully extended position to strip the cut piece from the pin and thereby release and remove it from the cylinder. Preferably, the released scrap piece is propelled into a chute or other container for collecting scrap pieces.

Claims

1. A mechanism for removing pieces cut from a web of material comprising:

a pair of cylinders constructed and arranged to be mounted for rotation in generally superimposed relation with a web of material passing through the nip between them, a pin carried by one of the cylinders and having a tip constructed and arranged to pierce a piece of material cut from the web and receive the piece on the pin, a sleeve received over the pin, said sleeve and pin being relatively movable to a first position wherein the tip of the pin projects beyond one end of the sleeve and generally radially outwardly of such one cylinder, and to second position spaced from the first position in which said tip is received in said sleeve, a retainer releasably retaining the sleeve and pin in said relative first position thereof, said retainer having a plurality of circumferentially spaced apart cams operably associated with one of said sleeve and pin, an indexable ring having a plurality of circumferentially spaced apart followers operably associated with at least some of said cams, and a spring yieldably urging at least some of said followers and cams into operative relationship, an actuator carried by the other cylinder and constructed and arranged so that as the pin and sleeve pass through the nip of the cylinders a piece of material cut from the web is pierced by the tip and forced onto the pin, the pin and sleeve are relatively moved from their second position toward their first position and said retainer is actuated to retain them in their first position, and a release adjacent said one cylinder, downstream of the nip of said cylinders, and constructed and arranged to release said retainer when said pin and sleeve pass by said release so that said sleeve and pin relatively move to said second position and thereby strip and remove the cut piece from said pin to release the cut piece from said one cylinder.

2. The mechanism of claim 1 which also comprises a spring operatively associated with at least one of said pin and sleeve and yieldably biasing them toward their relative second position.

3. The mechanism of claim 1 in which said actuator comprises a pad carried by said other cylinder and when said pin passes through the nip being generally opposed thereto with the tip of the pin projecting into said pad.

4. The mechanism of claim 3 in which said pad comprises a resilient material.

5. The mechanism of claim 4 wherein said pad has a clearance recess into which said tip of said pin projects when they pass through the nip of said cylinders.

6. The mechanism of claim 1 wherein the release comprises a roller co-rotating with said one cylinder and constructed and arranged to bear on the cut piece and relatively move said sleeve and pin to release said retainer as the cut piece passes through the nip between said roller and said one cylinder.

7. The mechanism of claim 6 wherein at least the peripheral surface of said roller is of a compliant material.

8. The mechanism of claim 1 which also comprises a plurality of circumferentially spaced first keys carried by said sleeve and extending generally axially thereof, a plurality of circumferentially spaced apart guideways carried by the cylinder carrying the pin and complementarily engageable with at least some of said first keys for restraining rotation of said sleeve relative to the one cylinder carrying the pin while permitting said sleeve to reciprocate generally axially relative to the one cylinder carrying the pin, a plurality of second keys equally circumferentially spaced apart and carried by said ring and receivable in some of said guideways for guiding said ring for generally axial reciprocation relative to the one cylinder carrying the pin, said followers being equally circumferentially spaced apart and carried by said ring, and a plurality of circumferentially spaced apart and inclined ramps carried by the one cylinder carrying the pin and constructed and arranged to cooperate with said followers of said ring to rotatably index said ring and releasably retain the sleeve and pin in said first position thereof.

9. The mechanism of claim 8 wherein said guideways alternate between first and second guideways having a different radial depth with said first guideways having a greater radial depth than the radial depth of said second guideways and said second keys on said ring are slidably receivable in said second guideways and project radially sufficiently that they will overlap and cannot be received in said first guideways.

10. A mechanism for removing pieces cut from a web of material comprising:

a pair of cylinders constructed and arranged to be mounted for rotation in generally superimposed relation with a web of material passing through the nip between them, a housing carried by one of said cylinders a pin carried by said housing and having a tip constructed and arranged to pierce a piece of material cut from the web and receive the piece on the pin, a sleeve received over the pin and disposed in said housing, said sleeve and pin being relatively movable to a first position wherein the tip of the pin projects beyond one end of the sleeve and generally radially outwardly of said one cylinder, and to second position spaced from the first position in which said tip is received in said sleeve, said sleeve and said housing having operably associated keys and guideways permitting axial movement of said sleeve relative to said housing and limiting any rotary movement of said sleeve relative to said housing, a retainer releasably retaining the sleeve and pin in said relative first position thereof, an actuator carried by the other cylinder and constructed and arranged so that as the pin and sleeve pass through the nip of the cylinders a piece of material cut from the web is pierced by the tip and forced onto the pin, the pin and sleeve are relatively moved from their second position toward their first position and said retainer is actuated to retain them in their first position, a release adjacent said one cylinder, downstream of the nip of said cylinders, and constructed and arranged to release said retainer when said pin and sleeve pass by said release so that said sleeve and pin relatively move to said second position and thereby strip and remove the cut piece from said pin to release the cut piece from said one cylinder, and said retainer has an indexable ring received in said housing, a plurality of circumferentially spaced cams and a plurality of followers operably associated with said cams, one of said cams and followers being carried by said sleeve and the other of said cams and followers being carried by said indexable ring, a spring yieldably urging at least some of said cams and followers together into a cooperative relationship and said sleeve towards said second position, and ramps carried by said housing and operably associated with said indexable ring whereby reciprocation of said sleeve and ring by said actuator moves said sleeve to said first position and by said release moves said sleeve to said second position.

11. The mechanism of claim 10 wherein said keys include a plurality of circumferentially spaced first keys carried by said sleeve and extending generally axially thereof and a plurality of equally circumferentially spaced apart second keys carried by said ring, said guideways being circumferentially spaced apart, carried by said housing and complementarily engageable with at least some of said first keys for restraining rotation of said sleeve relative to said housing while permitting said sleeve to reciprocate generally axially relative to said housing and complementarily engageable with at least some of said second keys for guiding said ring for generally axial reciprocation relative to said housing, said followers being equally circumferentially spaced apart and carried by said ring, and a plurality of circumferentially spaced apart and inclined ramps carried by said housing and constructed and arranged to cooperate with said followers of said ring to rotatably index said ring and releasably retain the sleeve and pin in said first position thereof.

12. The mechanism of claim 11 wherein said guideways alternate between first and second guideways having a different radial depth with said first guideways having a greater radial depth than the radial depth of said second guideways, and said second keys on said ring are slidably receivable in said second guideways and project radially sufficiently that they will overlap and cannot be received in said first guideways.

13. A mechanism for removing pieces cut from a web of material passing through the nip of a pair of cylinders constructed and arranged to be mounted for rotation in generally superimposed relation, the mechanism comprising:

a housing constructed to be carried by one of the cylinders, a pin disposed in the housing and having a tip constructed and arranged to project from the housing to pierce a piece of material cut from the web and receive the piece of material on the pin, a sleeve received over the pin and carried by the housing, said sleeve and pin being relatively movable to a first position wherein the tip of the Din projects beyond one end of the sleeve and generally radially outwardly of such one cylinder, and to second position spaced from the first position in which said tip is received in said sleeve, a retainer releasably retaining the sleeve and pin in said relative first position thereof, said retainer having a plurality of circumferentially spaced apart cams operably associated with one of said sleeve and pin, an indexable ring having a plurality of circumferentially spaced apart followers operably associated with at least some of said cams, and a spring yieldably urging at least some of said followers and cams into operative relationship, an actuator carried by the other cylinder and constructed and arranged so that as the pin and sleeve pass through the nip of the cylinders a piece of material cut from the web is pierced by the tip and forced onto the pin, the pin and sleeve are relatively moved from their second position toward their first position and said retainer is actuated to retain them in their first position, and a release adjacent the one cylinder downstream of the nip of the cylinders, and constructed and arranged to release said retainer when said pin and sleeve pass by said release so that said sleeve and pin relatively move to said second position and thereby strip and remove the cut piece from said pin to release the cut piece from the one cylinder.

14. The mechanism of claim 13 which also comprises a plurality of circumferentially spaced apart first keys carried by said sleeve and extending generally axially thereof, a plurality of circumferentially equally spaced apart guideways carried by said housing and complementarily engageable with said first keys for restraining rotation of said sleeve relative to said housing while permitting said sleeve to reciprocate generally axially relative to said housing, a plurality of second keys equally circumferentially spaced apart and carried by said ring and receivable in some of said guideways for guiding said ring for generally axial reciprocation relative to said housing, said followers being equally circumferentially spaced apart and carried by said ring, and a plurality of circumferentially spaced apart and inclined ramps carried by said housing and constructed and arranged to cooperate with said followers of said ring to rotatably index said ring and releasably retain the sleeve in said first position thereof.

15. The mechanism of claim 14 wherein said guideways alternate between first and second guideways having a different radial depth with said first guideways having a greater radial depth than the radial depth of said second guideways, and said second keys on said ring are slidably receivable in said second guideways and project radially sufficiently that they will overlap and cannot be received in said first guideways.