US2727234A

US2727234A - Anvil structure for stapling machines

Info

Publication number: US2727234A
Application number: US304108A
Authority: US
Inventors: John F Filsinger
Original assignee: Textile Marking Machine Co Inc
Current assignee: Textile Marking Machine Co Inc
Priority date: 1952-08-13
Filing date: 1952-08-13
Publication date: 1955-12-20
Anticipated expiration: 1972-12-20

Description

D c- 9, 1955 J. F. FILSINGER ANVIL STRUCTURE FOR STAPLING MACHINES 2 Sheets-Sheet 1 Filed Aug. 13, 1952 P e R 00 m mm Y m W F. W H n a Y B NA! Dec. 20, 1955 J. F. FILSINGER ANVIL STRUCTURE FOR STAPLING MACHINES 2 Sheets-Sheet .8

Filed Aug. 13, 1952 INVENTOR. Jo/UZ fifF/Zs/nger BY :9. W y'wm A 7'7'OR/VEY ANVIL STRUCTURE FOR STAPLING MACHINES John F. Filsinger, Syracuse, N. Y., assiguor to Textile Marking Machine Co., Inc., Syracuse, N. Y., a corpostructure for use in such machines. the anvil of the machine consists of a metal member on which the material to be stapled is usually positioned, the stapling head being movable into engagement with material and being operable to eject a staple and insert the prongs of the staple through the material, the anvil being formed with spaced apart concavities which are engaged by the ends of the prongs of the staple as it emerges from the rear side of the material, whereby these prongs are curved, usually inwardly toward each other, but sometimes outwardly. With this arrangement, the prongs are curved inwardly, or outwardly, and upwardly toward the back side of the material whereby the clinched prongs do not lie parallel and in close engagement with the rear side of the material.

This method of clinching the staple is suitable for some work, such as attaching sheets of paper together in office work. However in other instances it is disadvantageous, such for example, in attaching marking tags to garments and the like in laundry and dry cleaning plants.

This invention has as an object an anvil structure for stapling machines embodying a structural arrangement by which the prongs of the staple are entirely passed through the material being stapled and subsequently, the prongs of the staple are brought into engagement with a clinching bar which functions to bend the prongs contiguous to the material, whereby the prongs are not curved but lie flat, or parallel, to the material and in close engagement therewith.

accompanying drawings in which like characters designate corresponding parts in all the views.

nited States Patent ration of New York Application August 13, 1952, Serial No. 304,108

4 Claims. (Cl. 1--3) This invention has to do with stapling machines of the type commonly employed for inserting a two-prong wire staple through sheet material, such as paper or fabric, and clinching the prongs by bending the same over the back side of the material being stapled.

More particularly this invention has to do with an anvil At the present time,

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the In the drawings- Figure l is a side elevational view of a stapling machine having an anvil structure embodying my invention.

Figure 2 is an end elevational view of the structure shown in Figure 1, illustrating the staple being initially inserted through the material.

Figure 3 is a view, similar to Figure 2, illustrating the position of the parts of the anvil when the prongs of the staple are clinched.

Figure 4.

Figure 6 is a view taken on line 6-6, Figure 4.

Figure 7 is a view, similar to Figure 5, showing the staple in clinched form.

Figure 8 is an enlarged view of a staple clinched by conventional anvil structure.

Figure 9 is an enlarged view of a staple clinched with the anvil embodying my invention.

In Figure l, the stapling head 20 is pivotally mounted at one end to a frame member 21. The anvil consists of a support member 22 having a laterally extending base portion 23 attached to the forward end of the frame 21, as by screws 24. The support 22 is formed .at its upper end with a rectangular recess or slot in which there is slidably mounted a rectangular block 26, the upper or outer end portion of which is formed with a transversely extending slot 27 whereby the outer end portion is bifurcated.

The upper or outer end portion of the support 22 on opposite sides of the block 26 are also formed with a slot 28, the slots 28 being arranged in registration with the slot 27. A clinch bar in the form of a plate 30 is positioned in the

slots

27, 28, and is fixedly secured to the support, as by screws 31.

The block 26 is yieldingly urged outwardly with the bottom wall 33 of the slot 27 engaging the lower edge of the clinch bar 30, as shown in Figures 2, 5 and 6, and in this position the outer end or ends of the bifurcated portion of the block are positioned outwardly in spaced relation from the upper edge of the clinch bar.

The block 26 is engagedat its inner end by a plunger 36 slidably mounted in a bushing 37 mounted in a circular bore formed in the support 22. Theplunger 36 is urged outwardly by a helical compression spring 38 interposed between the plunger ,36 and the bottom wall of a recess 39 formed in the support member, see Figures 5, 6 and 7.

The outer end of the bushing 37 is .counterbored to provide a shoulder 40, The plunger 36 is formed with a transversely extending aperture in each .end of which there is positioned a ball 41 and there is positioned, intermediate the balls, a helical compression'spring 43.

With the block 26 in normal outward position, as shown in Figures 2, 5 and 6, the balls 41 engage the shoulder 40. This arrangement serves as a detent to maintain the plunger 36 and the block 26 in outward or upward position.

With the material to be stapled, such as the sheets 44, positioned on the outer bifurcated ends of the block 26, the stapling head 20 is moved into engagement with the sheets and further downward movement of the actuator 46 causes a staple to be ejected and the prongs inserted through the sheets. The slot 27 of the block 26 is arranged in registration with the ejected staples so that the prongs, indicated at 48, extend into the slot 27. Further downward movement of the stapling head 20 effects downward or inward movement of the block 26, causing the ends of the prongs 48 of the staple to engage the upper end of the clinch bar 30. The central portion of the clinch bar is recessed or relieved, as at 50, this relief terminating or merging with the top edge of the bar on a slight radius, indicated at '51, and which functions to direct the ends of the prongs toward the center of the block 26, this bending of the prongs continuing upon downward movement of the stapling head and, of course, upon downward movement of the block 26 against the action of the spring 38, this movement continuing until the lower end of the plunger 36 seats against the bottom of the recess in which the bushing 37 is mounted, see Figure 7. At this time, the outer bifurcated ends of the block 26 are flush with the upper edge of the clinch bar 30, see Figure 7, and when the parts have reached this position, the prongs 48 of the staple have been folded parallel and in close contact with the under side of the material 44.

One function of the detent ball 41 is to increase the initial resistance against inward movement of the plunger 36, the object being to maintain the block 26 in outward position with sufficient force to assure complete penetration of the staple through the material being stapled and to provide a snap action to the block 26that is, when sufiicient pressure has been applied'to crowd the detent balls 41 inwardly from the shoulder 40. The pressure necessarily applied to the outer end of the block to accomplish that result is substantially more than necessary to efiect compression of the spring 38 whereupon the block 36 descends quickly to efiect a proper and eflicient clinching of the staple prongs.

What I claim is:

1. A flat clinch anvil structure for stapling machines comprising a support formed with a bore extending inwardly from one end, a material supporting member slidably mounted in said bore and being formed at its outer end portion with a slot extending transversely thereof, a clinch bar positioned in said slot and having its ends fixedly secured to said support, means mounted in said bore and yieldingly maintaining said member with the slotted end thereof positioned outwardly from the bar for engagement by a stapling head and for the reception of the prongs of the staple in the slot above said bar, said material supporting member being movable inwardly by the stapling head to permit the prongs of the staple to engage the bar for clinching.

2. A flat clinch anvil structure for stapling machines comprising a fixed support formed with a bore extending inwardly from one end thereof, a material supporting member slidably mounted in said bore, the outer end portion of said member being formed with a transversely extending slot, at clinch bar positioned in said slot and having its ends fixedly mounted in said support, spring means mounted in said bore and yieldingly maintaining said member with the slotted end thereof positioned outwardly from the bar for engagement by a stapling head and for the reception of the prongs of the staple in the slot above the bar, said member being movable inwardly by the stapling head to permit the prongs of the staple to engage the bar for clinching.

3. A flat clinch anvil structure for stapling machines comprising a rigid support formed with a bore extending inwardly from one end thereof, a material supporting member slidably mounted in said bore, the outer end portion of said member being formed with a transversely extending slot, a clinch bar positioned in said slot and having its end portions fixedly secured to said support, a plunger slidably mounted in said bore below said member, spring means acting on said plunger to urge the plunger against said member and position said member with the slotted end thereof outwardly from the bar for engagement by a stapling head and for the reception of the prongs of the staple in the slot above said bar, and said member being movable inwardly against said spring means by the stapling head to permit the prongs of the staple to engage the bar for clinching.

4. A flat clinch anvil structure for stapling machines comprising a rigid support formed with a bore extending inwardly from one end thereof, a material supporting member slidably mounted in said here, the outer end portion of said member being formed with a transversely extending slot, at clinch bar positioned in said slot and having its end portions fixedly secured to said support, a plunger slidably mounted in said bore below said member, spring means acting on said plunger to urge the plunger against said member and position said member with the slotted end thereof outwardly from the bar for engagement by a stapling head and for the reception of of the prongs of the staple in the slot above said bar, and said member being movable inwardly against said spring means by the stapling head to permit the prongs of the staple to engage the bar for clinching, and spring actuated detent means carried by said plunger and operable to resist initial inward movement of said material supporting member and plunger by the stapling head.

References Cited in the file of this patent UNITED STATES PATENTS 195,603 Heyl Sept. 25, 1877 221,979 Shellenberger Nov. 25, 1879 515,028 Templer Feb. 20, 1894 1,118,312 Smith Nov. 24, 1914 2,143,427 Abbate Ian. 10, 1939