US2781092A

US2781092A - Severing device

Info

Publication number: US2781092A
Application number: US424347A
Authority: US
Inventors: Berthel F Madsen
Original assignee: Teletype Corp
Current assignee: AT&T Teletype Corp
Priority date: 1954-04-20
Filing date: 1954-04-20
Publication date: 1957-02-12
Anticipated expiration: 1974-02-12

Description

Feb. 12, 1957 B. F. MADSEN 2,781,092

SEVERING DEVICE Filed April 20, 1954 INVENTOR BERTHEL F. MADSEN ATTORNEY United States i atcnt 1 2,781,092 SEVERING DEVICE Berthel F. Madsen, Chicago, 111., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application April 20, 1954, Serial No. 424,347 7 Claims. (Cl. 164-41) This invention relates to severing devices and more particularly to power operated severing devices for severing continuous web or sheet material.

In the handling of paper or fabric which is often packaged in concentric layers in the form of web rolls or bolts it is frequently the practice to cut any undesirable margins from the web or sheet. This cutting operation may be accomplished just prior to the initial winding of the material after manufacture thereof or at a subsequent rewinding operation.

for example, the stationery used in tabulating machmcs or printing telegraph apparatus frequently consists of a continuous web composed of several layers of record paper interleaved with carbon paper or transfer material where all the record paper and the transfer material are fastened as by gluing together along one margin thereof. it is sometimes the practice to provide marginal feed holes along either or both margins to facilitate advancing the web and to maintain the relative posit1on of each layer of the composite, continuous sheet. After utilizing the tabulating machine or the printing telegraph apparatus to record intelligence upon the com tinuous sheet it is desirable to remove the margin along which the record paper and carbon material have been fastened together.

Accordingly, it is an object of this invention to provide a severing device for automatically cutting a continuously advancing web.

It is a further object of this invention to provide a cutting device for severing a margin from a continuous record operable in cooperation with a record feeding device.

Still another object of the invention is to provide a new and improved scissor type severing device.

An apparatus illustrating certain features of the presentnnvention may include a solenoid having an armature which is rotatable as well as axially movable, said armature being rotatable within predetermined limits and having a shaft integral therewith, a material engaging Wheel mounted upon the shaft and rotatable with respect thereto, said wheel having an internal ratchet, a pair of coopcrating cutting elements, means for rotating the shaft in counterclockwise and clockwise directions, means mounted upon the shaft for actuating the cutting elements when said shaft rotates and means mounted upon the shaft for engaging said ratchet when said shaft rotates in a predetermined direction.

The above-mentioned and other objects of the inven tion will be more apparent from the following detailed description of an embodiment of the invention when considered in conjunction with the appended drawings wherem:

Fig. 1 is a side view of an apparatus employing the present invention with parts broken away to show the armature, the coil, and the switching mechanism of a rotary solenoid;

Fig. 2 is an elevational view of the right side of Fig. l with portions of the cover removed;

Fig. 3 is a view of Fig. 1 taken along the line of 33; and

Fig. 4 is a view of the severing apparatus mounted upon the console of a printing telegraph apparatus.

R f i w to .the drawings there is shown in Fig. 1 a rotary solenoid and a switching mechanism of the type disclosed in United States Patent No. 2,501,950, to

2,781,092 Patented Feb. 12, 1957 the bracket 11 is a cup 16 whose cylindrical portion 17 accommodates a toroidal coil 18 and cores 39. Cores 30 have a central bore 20 therethrough for receiving a sleeve bearing 23. Three inclined races or grooves 21 are formed in the bottom of the cup 16 in the same manner and for the same purpose as disclosed in said patent to Leland. An armature plate 24 having inclined grooves 25 corresponding to the grooves 21 is mounted upon a shaft 27 adjacent an armature 26. The shaft 27 is supported by the bearing 23 which in turn supports a feed wheel 42.

Armature 26 is centrally located with respect to a clearance hole 28 formed in the cup 16. The armature plate 24 and the cup 16 are spaced apart a predetermined distance with three identical ball bearings 19 interposed therebetween. As disclosed in said patent to Leland, maximum spacing occurs between the armature plate 24 and the cup 16 when the ball bearings are poised at the entrances or shallow ends of corresponding grooves. A collar spring 32 holds the solenoid assembly together by constantly urging the armature 26 and the shaft 27 to the right (Fig. 1). Upon energizing the coil 18 the armature plate 24 is pulled or attracted to the right (Fig. l) in an attempt to close the air gap between the armature 26 and the cores 3%. Because of the conformation of the grooves 21 and 25, their relative positions, and the positionment of the ball bearings 29, the tendency of the armature plate to move to the right is translated into a turning moment causing the shaft 27 to rotate in a clockwise direction (Fig. 2) through a predetermined angle. A pair of bushings 33 are supported in a bracket 34 secured to the cover 12. A fibre plate 36 is secured to the bushings 33 by means of the screws 37. A switch 33 (Fig. 3) composed of a fixed contact 39 and a movable contact 43 integral with a spring 44 is suitably mounted upon the fibre plate 36. The structure and operation of the switch is similar to the switch disclosed in said patent to Leland. When closed, the contacts complete an electrical circuit through a suitable power source and the coil 18 to energize the solenoid. A switch actuating member 56 having two arm 57 is pivotally mounted upon the shaft 27 and is held in place by a plate45. Keyed to the shaft 27 is a disc 58 having a lug 59 extending between arms 57 of the switch actuating member 56. A spring 61 is fastened to the eye 62 of the.

disc 58 and is utilized to urge the shaft 27 in a clockwise direction as viewed in Fig. 3. The

contacts

39 and 43 are normally closed and are opened when the shaft rotates counterclockwise (Fig. 3) sutficiently to permit the lug 59 to contact the lower arm 57 of the switch actuating member 56 thereby driving the upper arm 57 into contact with the spring 44. Assuming that the switch 38 is closed, energization of the coil 18 will cause the armature 26 and the shaft 27 to rotate counterclockwise (Fig. 3) until the lug 59 encounters the lower arm 57 rotating the switch actuating member 56 to open switch 38. At this moment return spring 61 which is constantly urging the shaft 27 in a clockwise direction (Fig. 3) will tend to rotate the armature and shaft, until the lug 59 drives the upper arm 57 out of engagement with the spring 44 thus permitting the switch 38 to close again. Upon closure of the switch 38 the above cycle recurs. It is v.3 apparent that the spacing of the arm 57 limits the angular travel of the armature and that the armature is driven in a counterclockwise direction (Fig. 3) electrically and refurns in responseto the return spring 61 as disclosed in said patent to Leland.

Rotatably mounted on the forward end of the shaft 27 is a feed wheel 42 having a plurality of pins 46 located along the periphery thereof and having an internal ratchet 47. Keyed to the extreme right end (Fig. 1) of the shaft 27 by means of a set screw 43 is a cross arm 49. Pivotally mounted to one end of the cross arm 49 is a pawl 53 which is continually urged into engagement with the ratchet 47 by a spring 51. Mounted on the opposite end of the cross arm 49 is a roller 52. Pivotally mounted to the bracket 11 is a" cutting element 53 having a cam surface 54 such that clockwise (Fig. 2) rotation of the shaft 27 will cause the roller 52 to earn the cutting element 53 downwardly and across the face of a cooperating cutting element 55 integral with the bracket 11 (Fig. l). A spring 66 is provided so as to urge the cutting element 53 in a clockwise direction (Fig. 2) constantly. The severing device operates in the following manner: assume that a web of record paper 15 having perforations 64 along the margin thereof is disposed in the manner shown in Fig. 4 with the feed hole perforations 64 in engagement with the pins 46. Assume further that the paper 15 is being fed intermittently in the direction of the severing device by a record feeding device. (In this particular embodiment of the invention the record feeding device is the line feed mechanism of the printing telegraph apparatus of Fig. 4.) With the paper 15 held motionless momentarily by the feeding device, energization of the solenoid will cause the shaft 27 to rotate in aclockwise direction (Fig. 2) causing the cutting element 53 to be cammed downwardly to cooperate with cutting element 55 so as to cut the paper 15 disposed therebetween. The feed wheel 42 remains motionless, being so held by the paper 15 which in turn is being held by the feeding device. While the cutting element 53 is being camrned downwardly, the pawl 50 will ride over the ratchet 47 in a clockwise direction. When the shaft 27 has rotated through an angle sufficient to permit the lug 59 to engage the lower arm 57 causing the upper arm 57 to open the switch 38 (thereby de-energizing the coil 18), the spring 61 will immediately urge the armature 26 and shaft 27 in a counterclockwise direc tion (Fig. 2). The pawl 50 will engage the ratchet 47 causing the feed wheel 42 to tend to rotate counterclockwise thereby putting tension upon the paper 15. it is to be recalled that the paper 15 is being advanced in intermittent fashion, by the line feeding device of the printing telegraph apparatus 13, consequently, upon the next advance of the paper by the feeding device the feed wheel 42 will be permitted to rotate counterclockwise (Fig. 2) in response to the spring 61 and as the paper advances the cutting element 53 will move upwardly, clear of the paper (initially motivated by the spring 66 and an instant later in response to the spring 66 and the carnrning action jointly). Accordingly, when the lug 59 engages the upper arm 57 the switch 38 will again be closed causing the above cycle to be repeated. it is to be noted that shaft 27 and feed wheel 42 respond to the spring 61 only when the record paper 15 is released or advanced by the line feed mechanism of the printing telegraph apparatus 13.

Although only one embodiment of the invention has been disclosed herein it is to be understood that the invention is susceptible of various modifications and adaptations which are'entirely within the scope thereof.

What is claimed is:

1. A material severing device comprising a pair of cooperating cutting elements, a rotatable shaft, a lever mounted upon the shaft and adapted to move one cutter with respect to the other when said shaft is rotated, niaterialadvancing means mounted upon the shaft in positiveehgagement with the material and adaptable to prevent rotation'of said shaft in a predetermined direction vance of said material. 7

2. A material severing device comprising a rotatable shaft, an electric motor adapted to rotate said shaft in apredetermined direction and through a predetermined are, means for rotating said shaft through said predetermined are but in reverse direction, a pair of relatively movable cutting elements, a lever mounted upon the shaft and adapted to engage and move one cutting element with respect to the other when said shaft rotates, intermittently operable material advancing means and braking means mounted upon the shaft and engaged with said material whereby reverse rotation of said shaft is prevented except when said material is advanced.

3. In a work controlled device for trimming an intermittently moving web, a pair of cooperating cutters, means for moving said cutters into cutting relationship, a second means for moving said cutters out of cutting relationship, a braking means for preventing operation of said second means, and means controlled by the advance of said web for disabling said braking means.

4. In a work controlled device for trimming an intermittently moving web, a pair of cooperating cutters, a ratchet adapted to be moved by said web, a means movable relative to said ratchet for moving said cutters into cutting relationship and a means stationary relative to said ratchet for moving said cutters out of cutting relationship.

5. A work controlled device for trimming an intermittently moving web comprising a pair of cooperating cutters, an oscillatory means for moving said cutters into and out of cutting relationship, a ratchet in positive engagement with said web, and a ratchet pawl articulated to said oscillatory means and engaged with said ratchet as to allow relative motion between said oscillatory means and said ratchet in one direction only.

6. In a material severing device for trimming an intermittently moving web, a pair of cooperating cutters, a shaft, means for rotating said shaft through a predetermined arc from its home position, means controlled by the rotation of said shaft for moving said cutters into cutting relationship, means for urging said shaft toward its home position, means controlled by the return of said shaft to its home position for moving said cutters out of cutting relationship, braking means for preventing the return of said shaft to its home position and means controlled by the advance of said web for disabling said braking means.

7. in a device for trimming an intermittently moving web, a stationary cutter, a movable cutter adapted to be moved into cutting relationship with said stationary cutter, a cylindrical internal ratchet having its external surface in positive engagement with said web, a cross arm positioned within said ratchet, means for rotating said cross arm through a predetermined are from its home position, means controlled by the rotation of said cross arm for moving said movable cutter into cutting relationship, means for urging said cross arm from its rotated position toward its home position, a ratchet pawl fastened'to said cross arm as to allow rotation of said cross arm relative to said ratchet away from said home position and prevent relative rotation of said cross arm toward its home position, and means controlled by the rotation of said cross arm to its home position for moving said movable cutter out of cutting relationship with said stationary cutter.

References Cited in the file of this patent UNITED STATES PATENTS