Bursting apparatus

• US 3,888,399 A
• Filed: 10/31/1972
• Issued: 06/10/1975
• Est. Priority Date: 10/31/1972
• Status: Expired due to Term

• Current Assignee: Eriks Parups, Walter J. Hanson
• Original Assignee: Eriks Parups, Walter J. Hanson
• Inventors: Hanson, Walter J., Parups, Eriks
• Primary Examiner(s): Yost, Frank T.
• Application Number:
  US05/302,607
• Time in Patent Office: 952 Days
• Field of Search: 225/100,101,106
• US Class Current: 225/106
• CPC Class Codes: B41J 17/38 for dealing with the impression-transfer material after use
• CPC Class Codes: B41L 1/12 Severing webs to obtain single sheets or forms, e.g. by cutting, by bursting
• CPC Class Codes: Y10T 225/35 Work-parting pullers [bursters]
• CPC Class Codes: Y10T 225/393 Web restrainer

Abstract

A bursting apparatus is provided for separating and/or deleaving carbon paper from a multipart perforated continuous series of forms having carbon paper interleaved therein. The forms are fed to a bursting station which includes a clamp bar and a segmented bursting roller which is driven by a one-revolution clutch or the equivalent thereof. Each successive leading edge of the form actuates a stop-feed switch for automatically metering a single form length to the bursting station. The clutch is also actuated, thereby moving the clamp bar on the next succeeding form and the bursting roller revolves for one revolution to burst the leading form and deliver it to a deleaving station. The segmented burster roller has a slight helix on its engaging edge so that bursting tension will start at one edge and move progressively across the width of the form. The deleaving station has structure similar to that of the bursting station, but modified such that the clamping bar and bursting roller are positioned orthogonal to those in the bursting station and operate on the margin of the forms. When the leading edge of the form reaches stop fingers at the deleaving station, the clamp bar clamps one side margin of the form while the bursting roller revolves one revolution to separate the margin of the form to which the carbon paper is secured, thus deleaving the form. The bursting and deleaving operations are repetitive and continuous.

Claims

1. A bursting apparatus for separating a continuous series of forms having perforation lines therebetween into individual forms:

comprising A. feed means for intermittently advancing said continuous series of forms;

B. clamping means having a clamping condition for holding said continuous series of forms immobile and a release condition for allowing feed movement of said continuous series of forms;

C. actuating means for said clamping means;

D. burster roller means adapted when operated to apply a feed tension force to the leading form in said series of forms;

E. drive means for rotating said burster roller means; and

F. control means for controlling the operation of said clamp actuating means and said burster roller drive means to cause said burster roller means to apply a tension feed force to the leading form in said series while said clamping means is clamping the next form following said lead form in said series whereby said lead form may be separated from the remaining forms in said series;

G. said actuating means for said clamping means including a movable bar member and means for moving said bar between clamping and release positions, said bar member having an operative longitudinal edge that serves to operate said clamping means for any form length adjusted position of said clamping means along the length of said bar member.

2. A bursting apparatus for separating a continuous series of forms having perforation lines therebetween into individual forms:

comprising A. feed means for intermittently advancing said continuous series of forms so that the leading edge of the series is moved to a predetermined position;

B. clamping means having a clamping condition for holding said continuous series of forms immobile and a release condition for allowing feed movement of said continuous series of forms;

C. actuating means for said clamping means;

D. burster roller means positioned adjacent the leading edge of said continuous series of forms when the latter is in said position, and adapted when operated to apply a feed tension force to the leading form in said series of forms;

E. driving means for rotating said burster roller means; and

F. control means for controlling the operation of said clamping actuating means and said burster roller drive means to cause said burster roller means to apply a tension feed force to the leading form in said series while said clamping means is clamping the next form following said lead form in said series whereby said lead form may be separated from the remaining forms in said series;

G. said control including a switch means that is operative to cause said feed means to be disabled when said leading edge of said series of forms reaches said predetermined position.

3. The bursting apparatus set forth in claim 2, wherein said control means includes clutch means activated by said switch means for driving said burster roller drive means for one revolution, said burster roller drive means including means for actuating said clamping means prior to the bursting action and then releasing said clamping means.

4. The bursting apparatus set forth in claim 3 wherein said clamping means includes a rotatably mounted bar having a radially extending clamping portion that is adapted to be swung into and out of clamping contact with said forms.

5. The bursting apparatus set forth in claim 3, wherein said means for activating and releasing said clamping means comprises a step cam mounted on said burster roller drive means which drives a mechanical linkage coupled to said clamp means.