US2983921A

US2983921A - Apparatus for the manufacture of handle attachments for paper bags

Info

Publication number: US2983921A
Application number: US751485A
Authority: US
Inventors: Bagnall John
Original assignee: CANADA PAPER Co
Current assignee: CANADA PAPER Co
Priority date: 1958-07-28
Filing date: 1958-07-28
Publication date: 1961-05-16
Anticipated expiration: 1978-05-16

Description

May 16, 1961 J BAGNALL APPARATUS FOR T HE MANUFACTURE OF HANDLE ATTACHMENTS FOR PAPER BAGS July 28, 1958 Filed /NVENTOR I 1 i:

Jbu/v BAGNALL United States Patent APPARATUS FOR THE MANUFACTURE og HANDLE ATTACHMENTS FOR PAPER 11 GS John Bagnall, Windsor Mills, Quebec, Canada, assignor to Canada Paper Company, Quebec, Quebec, Canada Filed July 28, 1958, Ser. No. 751,485

3 Claims. (Cl. 1-2) This invention relates to improvements in apparatus for the manufacture of handle attachments for paper bags and more particularly to means for stapling two staples to each arm of the handle loop by a single head stitcher.

The present invention is an improvement over the stitching assembly shown and described in US. Patent No. 2,332,530 in which the two staples, securing each arm of the handle loop to the strip of cardboard, are sectfied in a single operation by means of a double head stitching machine. Double head stitching machines such as are used in Us. Patent No. 2,332,530 are complicated to set up and maintain in satisfactory operating condition over long runs of the handle forming apparatus, requiring frequent adjustment and maintenance. 0n the other hand, single head stitching machines are less complicated and can be maintained in operation over a longer period of time without adjustment and stoppages for maintenance.

The present invention consists essentially in the provision of means whereby, after one staple has been stitched to one of the arms of the looped handle and to the cardboard strip and while the feed rolls for the cardboard strip are still stationary, the feed rolls together with the cardboard strip and the handle former carrying the looped handle, are moved outwards in a direction at right angles to the normal line of travel of the cardboard strip through the machine. A second staple is then stitched to the arm of the handle and cardboard strip, after which the feed rolls, cardboard strip and handle former are withdrawn to the line of normal travel of the cardboard strip and the forward feed of the cardboard strip is resumed.

The object of the invention is to provide means in a handle forming apparatus whereby a single head stitcher can be used to apply two staples offset from each other on each arm of the looped handle.

Other objects of the invention will be apparent from the following specification and the drawings forming a part thereof, in which:

Figure 1 is a partial elevation of that portion of a handle forming machine in which the formed handle is stitched to a strip of cardboard.

Figure 2 is a plan view of the cardboard feed roll drive and reciprocating mechanism and showing a handle partly stitched to the cardboard strip.

Figure 3 is a vertical cross section of the machine taken on the line 3-3 of Figure 2.

Figure 4 is a view similar to Figure 3 but showing the feed roll and handle former moved out to bring the handle into position for a second staple to be stitched.

Figure 5 is a vertical section on the line 5--5 of Figure 3 showing the transverse push plate.

Figure 6 is a vertical section on the line 6-6 of Figure 3 showing the cam and cam lever.

Figure 7 is a plan view of the cam showing the inclined plane operating surface.

Referring to the drawings, the paper bag handle forming machine, more fully described in United States Patent No. 2,332,530, is here shown in part only, disclosing that part of the machine in which the cardboard strip is fed under a single head stitcher, stapling the arms of the loop formed handle to the cardboard strip.

The

side walls

5 and 6 of the machine support the feed roll driving mechanism comprising the intermittently driven spur gears 7 and 8. The spur gears 7 and 8 have

extension sleeves

7a and 8a, the extension sleeve 7a being rotatably mounted in the bearing block 11, while the extension sleeve 8a is rotatably mounted in the side wall 5. Both spur gears 7 and 8 with their

extension sleeves

7a and 8a are prevented from axial movement by suitable collars 7b and 8b. The shaft 9 is journalled in the bearing block 11a and is splined in the spur gear 7 for rotation therewith. A feed roll 10 is mounted on the end of the shaft 9 remote from the spur gear 7. The shaft 9a is journalled in the side wall 6 and is splined in the spur gear 8 for rotation therewith. A feed roll 12 is mounted on the end of the shaft 9a remote from the spur gear 8. The spur gears 7 and 8 are intermittently driven by any suitable means, not shown. A transverse push plate 13 is a sliding fit on both shafts 9 and 9a and has a side projection 13a drilled to receive the transverse push rod 14.

The transverse push plate 13 is moved from the position shown in Figure 3 to the position shown in Figure 4 by means of the rotary cam 15 driven by the shaft 16 which in turn is rotated by the spur gear 17 from other gearing not shown. The cam 15 has a raised projection 18 on its face. A rocker arm 19 is pivoted in the bracket 20 mounted on the inner face of the side wall 6. The top end of the rocker arm 19 is connected to the transverse push plate 13 by the link 21 while the lower end of the rocker arm 19 is provided with a roller 22 adapted to roll on the face of the cam 15 and be displaced by the raised surface 18 of the cam to effect transverse movement of the push plate 13. The roller 18 is kept in contact with the cam 15 by the spring 23 anchored to the sidewall 5 and to the pin 24 on the side projection 13a of the push plate 13 as shown in Figure 2.

Transverse displacement of the push plate 13 against the collars 25 and 26, which are anchored on the shafts 9 and 11, effects displacement of the shafts 9 and 11 and also of the

feed rolls

10 and 12. The handle former 27, in which the string looped handle 28 is formed, is secured on the end of the reciprocating rod 29. The shaft 14 secured at one end to the transverse push plate 13 engages in a slot 30 in the rod 29' so that the rod 29 and the handle former 27 are displaceable along with the

feed rolls

10 and 12, the slot 30 allowing the rod 29 free to be reciprocated relative to the fixed location of the shaft 14.

In the operation of this invention, the feed rolls carry the strip of cardboard 31 forward in the machine into the area where the string is fed through the handle former 27. After the handle 28 is formed with the ends of the handle projecting over the cardboard strip 31 and when the forward feeding of the cardboard strip has been stopped, the single staple 33 is stitched over the end of the handle securing it to the cardboard strip. During this stage the roller 22 is in contact with the normal face of the cam 15 as shown in Figure 3. The cam 15 is set in relation to the operation of the single head stapler 34 so that, after the staple 33 has been stitched, the raised portion 18 of the cam 15 will come round, forcing the roller 22 outwards and pivoting the rocker arm 21 into the position shown in Figure 4 against the tension of the spring 23. The feed rolls 10 and 12 while still not rotating are displaced sideways of the machine as is also the handle former 2.7. A second stroke of the single head stapler 34 secures the staple 35 after which the cam allows the push plate 13 to return to its normal position shown in Figure 3. The spring 23 ensures that the push plate 13 will always return to its normal position and that the roller 22 will be kept in contact with the cam 15 at all times. After the two staples 33 and 35 have stitched one end of the handle 28 to the cardboard strip 31, rotation of the spur gears 7 and 8 starts the feeding of the cardboard strip to bring the second end of the handle 28 under the stapler head 34 Where another set of staples 33 and 35 are stitched over the end of the handle to complete the securing together of the handle to the cardboard strip. The strip 31 with its secured handle 28 is then advanced in the machine and is severed from the strip.

By the use of the above described device with proper setting of rotation of the

feed rolls

10 and 12 and transverse displacement of the feed rolls and handle former a simple single head stitcher can be used in place of the double head stitcher formerly used resulting in greatly reduced initial cost of the machine, less complicated wire feeding through the stitcher, and longer operating life and maintenance cost both of the single head stitcher and of the machine as a whole.

What I claim is:

1. In a machine for forming string handle attachments for paper bags in which a formed string handle of U shape is secured by stitching the two ends of the U-shaped string handle to a strip of cardboard, a pair of shafts mounted in said machine for transverse movement therein, a spur gear splined to each of said shafts for relative transverse movement of said shafts with respect to said spur gears, the said spur gears engaging with each other for rotation in opposite directions, a pair of feed rolls mounted on said shafts for rotation therewith, the said feed rolls adapted to feed a strip of cardboard intermittently lengthwise of said machine, a string loop handle former mounted on said machine and connected to said shafts for transverse movement therewith, the said string loop handle former directing the two ends of the U-shaped string loop handle extending therefrom to overlay the strip of cardboard to which the extended ends of the handle are to be attached, a single head stitcher fixedly mounted on said machine and located above said advancing strip of cardboard, cam means moving said shafts, feed rolls, strip of cardboard and handle former transversely of said machine while the said spur gears and feed rolls are stationary to bring the extended ends of the formed handle and underlying strip of cardboard into two operative postions under said single head stitcher, firstly to apply a stitch over one extended end of the looped handle slightly inwards of one edge of the strip of cardboard and secondly to apply a stitch over the same extended end of the looped handle slightly inwards of the opposite edge of the strip of cardboard, means to rotate the said spur gears and feed rolls intermittently to advance said cardboard strip and handle former longitudinally of the said machine to bring the second of the extended ends of the U-shaped handle under the said single head stitcher, and means to operate said stitcher in both transverse and longitudinal positions of said string handle and strip of cardboard to secure said handle on said strip of cardboard.

2. In a machine of the character set forth in claim 1 in which the cam means includes a push rod connected to the handle former displacing the handle former transversely a distance equal to the transverse movemqit of the feed rolls. I

3. In a machine of the character set forth in claim 2 in which the cam means includes a rocker arm, a link connecting one end of the rocker arm with the feed roll shafts and push rod and has a roller at the other end contacting the face of a rotary cam.

References Cited in the file of this patent UNITED STATES PATENTS 1,762,857 Eaton June 10, 1930 2,332,530 Robinson Oct, 26, 1943 2,625,680 Finn Ian. 20, 1953