US1341156A - Magazine grinding apparatus for the manufacture of wood-pulp - Google Patents

Description

P. C. SCHAANNING.

MAGAZINE GRINDING APPARATUS FOR THE MANUFACTURE 0F WOOD PULP.

APPLICATION FILED MAR. 27, 1920.

1 ,34 1 1 56, Patented May 25; 1920.

H 1 2 SHEETS-SHEET I.

P. C. SCHAANNING.

MAGAZINE GRINDING APPARATUS FOR THE MANUFACTURE OF WOOD PULP. APPLICATION FILED MAR. 27, 1920.

1,341,15 A Patented May 25,1920.

2 SHEETSSHEET 2.

UNITED STATES,

PATENT OFFICE.

PEDER CHRISTIAN SCI-IAANNING, OF VESTRE AKER, NEAR CHRISTIANIA, NORWAY.

MAGAZINE GRINDING APPARATUS FOR THE MANUFACTURE OF WOOD-PULP.

To all whom it may concern:

Be it known that I, PEDER, CHRISTIAN SCHAANNING, a subject of the King of Norway, residing at Vestre Aker, near Christiania, Norway, have invented certain new and useful Improvements in Magazine Grindin Apparatus for the Manufacture of Woo -Pulp; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being'had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this i specification.

It is a,well-known fact that the greatest difliculty in obtaining a fully automatic operation of magazine grinding apparatuses for the manufacture of wood pulp depends upon the peculiar tendency of the wooden blocks to establish self-carrying bridge arches, so that the blocks during the refilling of the grinding com artment do not fall down automatically. ven if the maga zine widens downwardly the blocks are able to form bridge arches which must be dis turbed byhand power. These arches. may be formed between the side walls of the magazine and from the pressing plate of the pressing member to the opposite side wall of the magazine or to the sharpening device casing, and the arches therebydecrease periodically the effective grinding pressure.

The present invention has for its purpose to remove these inconveniences.

This is obtained by arranging in the inner wall of. the grinding compartment 1 or its supply hopper one or more upwardly moving members which constantly carry upward some of the woodenblocks located nearest tothe wall and some of which constitute in case an end block of a bridge arch, so that such arches are incessantly interrupted. The said members may move quite slowly andjthey preferably consist of rotatable knots or projections projecting in through the wall of the supply channel. or hopper about in level with the upper edge of the pressing piston or somewhat above the same.

Some constructional forms of the invention are illustrated in the accompanying drawing, in which Figure 1 is a vertical section. through a grindingyapparatus constructed in accordance withthe invention.

Specification of Letters Patent.

the stone 1, and the pistons 2. The dressing device for the stone 1 is arranged at 5.

Upon a shaft 6 two knot or cam disks 7 are arranged a suitable distance apart so that they may act upon the wooden blocks near their two ends. The drawing shows only one of these disks. The shaft 6 rotates slowly in the direction of. the arrow 8, whereby the cam projections 7 will enter the channel through slots in the channel wall 9, then catch the nearest located block I and move the blocks slowly upward, whereupon the projections will be withdrawn againthrough the wall slots. The block row 10, "Fig. 2, consequently will be moved slowly upward and thereby constantly interrupt any bridge arches 11, 12 or 13 that might have been formed, so that the blocks may always fall freely down into the compartment in front of the pressing plates 2.

Instead ofa shaft 6 with cam disks 7 endless chains with teeth or knobs may be arranged as shown in, Fig. 3, or; two screws with 'a large thread pitch may be used as indicated in Fig. 4, or other members may be made use of which act so asto move slowly but safely the wooden blocks 10 upward and thereby to interrupt the bridge.

arches formed.

In order to counteract the unfavorable fact which does not seldom occur, namely that the blocks which, are not reached by the cams 7 form bridgel arches 12 from the" pressing plate 2 to thelower art of the. inner magazine or channel wal 20 or to another stationary pointin the magazine, a ruler-or list 14 is arranged above the stone 1 in such a manner that it is pressed backward under constantly increased. pressure from the spring 15.

The list 14 is moved in guides 21 ar-. ranged concentrically tothje stone 1. It is provided with two racks 16 engaged by gear segmentsl'i-upon a shaft 18 having an arm I Patented May 25, 1920.

Application filed March 27, 1920. Serial No. 369,324.

1 9"wh'ichp'resses against one end of a spring 15, the other end of which in engagement with the magazine Wall20.

14 will be pressed back in a curved path 'determined by the guides until the arch is broken.

A bridge arch 13 which may be formed from the pressing plate 2 to the magazine wall 20 cannot bar the pressure because it is too much inclined in relation to the pressing direction.

The list 14 is, as mentioned, arranged movably in such a manner that it travels in a path concentrically to the stone periph ery. In the drawing this 1s ol tained by attaching the list lij-to one or two sliding pieces 22 carrying the racks 16. The list let thereby will perform a pulsating buffer motion, what is necessary if the cam disks 7 shall be able to fulfil their purpose in a satisfactory manner.'

It is obvious that the cam disks 7 or equivalent raising members may be arranged at the wall 20 instead of being placed at the wall or such member may be arranged at both walls. In the latter case the raising members at the wall 9 should move upward with a speed which is difi'er-.

ent from that of the members arranged at the wall 20. v

1 Claims:

1. In magazine grinding apparatuses for the manufacture of wood pulp, the combination of a magazine compartment for wooden blocks to be ground, a grinding stone, pressing members for forcing said blocks against said stone, and movable members arranged at or in the wall of the magazine or the part of same conducting the blocks tothe space between the stone and the pressing members inisuch a manner as to move the. blocks located near the said wall part in adirection away from the said space, whereby any self-carrying bridgearches of blocks are incessantly, interrupted.

2. In magazine grinding apparatuses for the manufacture of wood pulp, the combination of a magazine compartment for wooden blocks to be ground, a grinding stone, pressing members for forcing said blocks against said stone, and slowly rotating cam disks arranged in the wall of the magazine or the part of same conducting the blocks to the space between the stone and the pressing members the rotating direction of the disks being so that their projections act to move the blocks located near the said wall part in a direction away from the said space, whereby any self-carryingbridge-arches of blocks are incessantly interrupted.

.3. In magazine grinding apparatuses for the manufacture of woodpulp, the combination of a magazine compartment for wooden blocks to be ground, a grinding stone, pressing members for forcing said blocks against said-stone, and slowly rotating cam disks arranged just above the said pressing members and having projections entering through slots in the lower part of the magazine space conducting the blocks down into the space between the stone and the pressing members, said projections having such a rotating direction as to move the blocks located near the wall of the said magazine part slowly upward, whereby any self-carrying bridge-arches of blocks are incessantly interrupted.

4. In magazine grinding apparatuses for the manufacture of wood pulp as claimed in claim 1, the arrangement of upwardly movable bridge-arch interrupting members at the lower part of the outer wall of the channel conducting the blocks to the space between the stone and the pressing member.

5. In magazine grinding apparatuses for the manufacture of wood pulp, the combination of a magazine compartment for wooden blocks to be ground, a grinding stone, pressing members for forcing said blocks against said stone, upwardly movable members arranged in the wall of the magazine part conducting the blocks to the space between the stone and the pressing members, and a spring-pressed list arranged at the upper part ofthe stone so as to be able to yield backward under influence of pressures from block-bridges formed between the said list and the "pressing member, the upwardly movable members acting to move the blocks located near the said wall part in a direction away from the said space, whereby any selfcarr ying bridge-arches of blocks are incessantly interrupted.

6. In magazine grinding apparatuses for the manufacture of wood pulp, the combination of a magazine compartment for wooden blocks to be ground, a grinding stone, pressing members for forcing said blocks against said stone, upwardly mo abl; mert ers arranged in the wall of the magazine part conducting the blocks to the space between the stone and the pressing members, a springpressed list arranged at the upper part of the stone, and guides arranged concentrically with the stone axis so as to enable the list to yield backward under influence of presssures from block-bridges formed between the said list and the pressing members, the upwardly movable members acting to move the blocks located near thesaid wall part in a direction away from the said space, whereby any self-carrying bridge-arches of blocks are incessantly interrupted.

7. In magazine grinding apparatuses for the manufacture of wood pulp, the combination of a magazine compartment for wooden blocks to be ground, a grinding stone, pressing members for forcing said blocks against said stone, upwardly movable members arranged in the wall of the magazine part conduetingthe blocks to the space" between the stone and the pressing members, a springpressed list arranged at the upper part of the stone, guides arran ed concentrically with the stone axis,'an a spring-pressed lever transmittingspring-pressure to the list so as to enable it to yield backward with an 10 increasing resistance under influence of pressures from block-bridges formed between the said list and the pressing member, the

. upwardly movable members acting to move the blocks located near the said wall part in a direction'away from the said space, where- 15 l by any self-carrying bridgearches of blocks are incessantly interrupted.

In testimony that I claim the foregoing as my invention, I have signed my name in

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