US623332A - Machine for - Google Patents

Description

No. 623,332. Patented Apr. [8, I899.

M. R PAHTZSCH.

MACHINE FUR APPLYING METAL STRIPS T0 BOXES.

Application filed Sept. 28, 1898.)

(No Model.) 2 Sheets-Sheet I.

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No. 623,332. Patented Apr. l8, was.

m. n. PABTZSCH.

MACHINE FOR APPLYING METAL STRIPS TU BOXES.

(Application filed Sept. 28, 1898.) (No Model.) 2 SheatsSheet 2.

1 amilmm NlTED STATES PATENT Orricn.

MAX RICHARD PARTZSCI-I, OF DRESDEN LGBTAU, GERMANY.

MACHINE FOR APPLYING METAL STRIPS TO BOXES.

SPECIFICATION forming part of Letters Patent No. 623,332, dated. April 18, 1899.

Application filed September 28,1898. Serial No- 692,120. (No model.)

To all whom it may concern.-

Be it known that LMAx RICHARD PARTZSCH, a subject of the King of Saxony, residing at Dresden Lobtau, Saxony, Germany, have invented certain new and useful Improvements in or Relating to Means for Feeding Securing or Strengthening Strips in Box-Making and Similar Machines, (for which application for Letters Patent has been made in England June 20, 1398; in Hungary June 21, 1898; in France June 20, 1893; in Austria June 17, 1398, and in German Empire June 8, 1898,) of which the following is a specification.

The device for feeding securing-strips or strengthening-strips in box-making and similar machines according to this invention is based on the principle, which is well-known in itself, of effecting the advance of the strip toward the ham mer by means of a guide-lever, the (circular) path of which does not coincide with that of the hammer. Hitherto, however, the strips in machines of this kind have been generally gripped at a point at the back and pushed forward through a guide, which nec essarily presupposes a certain amount of rigidityin the strip. It is found that toothedmetal clamping-strips of slight rigidity bend up and buckle when pushed through, thereby jamming in the guide or becoming bent at their projecting points, whereby the advance becomes uncertain and inexact or impossible. Flexible strips of paper or fabric for gluing to the parts to be joined or strengthened cannot be fed in this way at all. Metal strips require in such machines a long and carefully-machined guide in order to prevent the strip from bending.

A secure and exact feeding of the strip and a cheaper and simpler construction of the machine are attained according to this invention by taking hold of the continuous clampingway of example a construction of the machine according to this invention, in which the strip is caused to advance during the descent of the hammer.

. Figure 1 is an elevation of a machine for applying or nailing on sheet-metal strips pro.- vided with the feeding device according to this invention, the hammer being shown in its raised position. Fig. l is a detail view. Fig. 2 shows the head of the hammer, a front portion of the hammer-arm in section, and a front portion of the anvil, with work placed on it, on a considerably larger scale than in Fig. 1, the hammer being here shown in its lowered position. Fig. 3 is a back View, and Fig. 4 a vertical cross-section, of the hammerhead on the line 4 4 of Fig. 2, the two figures 3 and 4 being on the same scale as Fig. 2. Fig. 5 represents in front elevation the clamping device or pawls. Fig. 6 shows the same in section on the line 6 6 of Fig. 5; and Fig. 7 shows one of the pawls viewed in the direction indicated by the arrow, Fig. 5. Figs. 5, 6, and 7 are shown on a larger scale than that of Figs. 2, 3, and 41.

The machine illustrated by way of example consists of a hammer A, which by means of its arm A is pivoted about a pin a and can be lowered on the anvil B by depressing a treadle A and rod to in opposition to the action of a spring a As the machine represented is intended for securing or applying corner-strips, the anvil B has inclined sides and the hammer is provided with corresponding longitudinal grooves of right angular cross-section, Fig. 4. For applying flat strips both the anvil and hammer must be flat. The work WV is placed in the well-known manner on the anvil from the front, the hammer is lowered, whereupon the clamp-strip S is advanced and the length corresponding to the work cut oit and applied. The strip S unrolls from a spool S.

Inside the cover 1, Figs. 2 and 3, there is guided in a groove in the rear end of the hammer a part 2, which forms the open guide for the clamping-strip and at the same time the lower blade of a pair of cutters. The opening in the part 2, having the shape of an inverted U, Fig. 3, and corresponding to the cross-section of the strip S, Fig. 4, forms the guide proper, while the sharp edge 2 at the front end of this guide forms the cutter-blade,

as stated. With said blade cooperates as the upper blade a plate 3, secured to the hammer A in front of the part 2, and provided with a recess having the shape of an inverted V. A spring 4, Fig. 2, in a fixed cap 5, drives, when the hammer is raised, the guide 2 as far down asits pin 6 can move downward in the slot in the cover 1, Fig. 3. Then the hammer is lowered, the part 2 strikes the anvil first, while the hammer still continues to descend. The relative movement of the cutter parts 3 and 2 2 causes them to become operative. v

At 7 there is pivoted to a projection of the part- 2 a pawl 8, bifurcated in front, Figs. 2 and 3, which engages with its two teeth the recesses of thestrip S (not shown in Fig. 3) and prevents it from moving back to the right.

9 is a spring acting on the pawl to keep it depressed.

In the guides formed by the lateral grooves in the hammer A and by the covering-plates 10, Figs. 2 and 4, there are arranged movable slide blocks 11, to which are secured the bosses 12 of the bifurcated guide-lever D. The two feed-pawls 13 are pivoted in the rear continuations of the blocks 11 in a plane at right angles to that of the movement of the strip. The heads of these pawls (shown more fullyin Figs. 5 to 7) are such that they form teeth 13*, beveled only on one side, and the strip S is supported at the top and bottom by the remaining edges. The teeth 13" are pressed inward, by springs 1t acting on the pawls, into engagement with the teeth or'intervals between teeth or between the projectionsof the clamping-strip. They grip the strip when moving in the direction indicated by the arrow, Fig. 6, while in the opposite direction they open outward without exercising any action on the strip. When the hammer strikes the anvil, the pawls being rounded off at their heads are forced outward by the cam-faces of the hammer, and thus brought outside the path of the hammer.

Assuming that the guide-lever D is pivoted about the center 61 and the hammer-head A is in the position shown by full lines in Fig. 1, in which position the hammer is adapted to completely cover the anvil when depressed, the two pawls 13 13 are at the rear end of the hammer and engage with one of the first teeth of the strip S, slightly' projecting through the guide-opening in the sliding piece 2. Then the hammer is depressed, the slide-blocks 11 are caused to advance in the guides in the hammer by the oscillation of the guide-lever about its pivot cl, and as the pawls are operative when moving in this direction the strip will be advanced to the extent equal to the length of the hammer. (See are I II III, Fig.1.) The same effect would be produced if the hammer were replaced by a vertically-guided stamp or plunger, for even in this case the path I II III cuts the vertical path of the hammer, and the required relative movement takes place if the dimensions be suitably chosen.

The length of the strip to be fed can be easily altered as desired in the construction described by making the hammer-head adjustable on the arm A and the guide-lever D movable in the manner to be described. For this purpose the arm A is provided in front with a longitudinal passage or slot, in which are adjustable bolts 15, Figs. 1 and 2. The shorter the length of strip to be cut and applied the farther forward must the hammerhead A be placed, the bolt 15 being tightened when the head is correctly adjusted. A side of the head A can he graduated according to any desired system of measurement or, still better, according to the number of teeth to-be applied at each operation. Opposite this scale, an example of whichis clearly indicated in Fig. 2, there is arranged on the arm A a fixed pointer 16. The lower end of the guidelever D works freely through an opening in a block (1, formed with side extensions 17, by which it is supported and upon which it turns. A spring 18 (which'can be replaced by a weight) tends to press the guide-lever downward until the shoulder 19 rests against the block d. In this position the guide-lever can only swing concentrically with the part cl. When the hammer is moved more to the front-for instance, as indicated by dotted lines in Fig. 1the guide-lever also takes up when the hammerisraised the position shown in dotted lines, the spring being compressed and the shoulder 19 being situated above the part d. When the hammeris being lowered, there is at first nomovement of the two pawls toward the part of the hammer. On the contrary the two pawls swing in the arc IV II concentrically with a, as the spring 18 draws the guide-lever as far down as is allowed by the descending hammer-head. In this way the two pawls remain, therefore, in their rear position, determined by the edges 00 of the slide-blocks 11, resting against the edges as of the part 2, Fig. 2. The shoulder 19 having, however, reached, at the point 11, the block 61 during the remainder of the travel II III the movement of the strip takes place in the manner described. The projection of the path II III onto the anvil corresponds to the length fed. I

In the construction described the feeding of the strip is effected during the descent of the hammer. It could, however, take place equally well during the ascent if the center of rotation of the guide-lever D were moved upward beyond the center of rotation at of the hammer. The feeding would also take place during the ascent of the hammer, if the feeding were to take place from the front and the center (1 were below the center a. Otherwise it would take place during the descent. If the feeding is effected from the front, the spool S for the strip is arranged above the machine and the strip is guided by a suitably-curved guide to the guide-openings 2, which must then of course also be arranged in front.

If the apparatus described is to be used for strips to be affixed by cementing them onto the material, the pawls 13 must be replaced by other clamping devices adapted to seize the strip during its advance or by pins penetrating into the strip.

I claim-- 1. In a machine for applying metal strips to boxes, the combination with the hammer adapted to be reciprocated back and forth, the guide-opening at one end of the hammer, through which the strip passes, and means for feeding and positioning the strip located on the hammer-head at a point beyond said guide-opening; substantially as described.

2. In a machine for applying metal strips to boxes, the combination with the reciprocating hammer, the guide-opening at one end of the hammerhead through which the strip passes, mechanism for feeding the strip forward'located at a point on the hammer-head beyond the guide-opening, and the bifurcated pawl pivoted to the rear end of the hammerhead and engaging the strip on each side to prevent its backward movement; substantially as described.

3. In a machine for applying metal strips to boxes, the combination with the reciprocating hammer, the guide for the strip, located at one end of the hammer, the blocks sliding in guides on the sides of the hammerhead, the strip-feeding device carried by the slides, the oscillating guide-lever connected to the slides, whereby the slides will be operated owing to the relative movement of the hammer and the arc of oscillation of the guide-lever; substantially as described.

4:. In a machine for applying metal strips to boxes, the combination with the reciproeating hammer, the slides carried thereby, the oscillating guide connected to the slides,

pawls carried by the slides, springs for holding said pawls in contact with the strip to grip the same as the hammer descends.

. 5. In a machine for applying metal strips to boxes, the combination with the reciproeating hammer, the slides carried by the hammer-head mechanism for reciprocating said slides, the pawls pivoted to the slides in aplane at right angles to that of the movement of the strip, springs for pressing said pawls inward, whereby as the hammer descends, the pawls will grip the strip and the strip be fed, but when the hammer ascends, said pawls will open out and release the strip; substantially as described.

6. In a machine for applying metal strips to boxes, the combination with the reciprocating hammer, the blocks sliding on the hammer-head, mechanism for operating said blocks, the pawls pivoted to said blocks to swing outward, and having teeth at the lower end beveled on one side only, springs for pressing the pawls into engagement with the strip, whereby when the block is moved forward, the teeth will grip and feed forward the strip, but will be forced outwardly by the strip when the block is moved backward; substantially as and for the purpose set forth.

7. In a machine for applying metal strips to boxes, the combination with the recipro- MAX RICHARD PARTZSCH. V

Vitnesses:

OTTO WOLFE, ALWI ARLOTT.

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