US1217395A - Thread-stitching machine for bookbinding. - Google Patents

Description

U. BISCHOF.

THREAD STITCHING MACHINE FOR BOOKBINDING.

APPLICATION man JUNE 3. 1915.

1,217,395. Patented Feb. 27, 1917.

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-U. BISCHOF.

THREAD STITCHING MACHINE FOR BOOKBINDING. APPLICATION HLED JUNE 3. 1915.

1,217,395, Patented Feb. 27,1917.

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ULRICH BISCHOF, 0F WINTERTHUR, SWITZERLAND, ASSIGN'OR TO GEBR. STAUBLI, OF

I I-IORGEN, SWITZERLAND.

THREAD-STITCHING MACHINE FOR BOOKBINDING.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Application filed June 3, 1915. Serial No. 31,962.

To all whom it may concern:

Be it known that I, ULRICH BISCHOF, a citizen of the Republic of Switzerland, residing at lVinterthur, in the Canton of Zurich, Republic of Switzerland, have invented certain new and useful Improvements in Thread-Stitching Machines for Bookbinding; and I do hereby declare the following to be a full, clear, and exact description of the 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 of reference marked thereon, which form a part of thisspecification,

My invention relates to thread-stitching machines for book-binding havinga reciprocating eyed needle, a reciprocating hooked needle to pass the needle thread through the sheet and a thread layer passing from one needle to the other and vice-versa. When such a machine works, the eyed needle penetrates in its downward stroke the sheet to be stitched, whereupon the thread-layer seizes the thread and carries it to the hooked needle which in its upward stroke raises the thread loop and carries the same through the thread loop belonging to the previously stitched sheet and surrounding the hooked needle. In this kind of machines the driving shaft carrying the cam disks is placed horizontally, as it is known, and the cam disks are arranged on both the sides of the frame of the machine in such a way, that all the working movements arederived from these cam-disks by means of levers and long connecting rods. It is evident that these machines cannot work with a high number of revolutions, since the large levers sling and the long connecting rods laterally dc.- flect, so that they do not exactly execute the movements as intended by the cam-disks. As a'result of these inexact working movements, the loops are formed irregularly or miss totally, so that stitches will be omitted.

Also the pricking motion does not surely work, because the lever and the rod connecting the latter to the prick-punch laterally deflect, so that the prick-punch does not sufficiently prick the holes in the sheet to be stitched and the upper needles when entering into the sheet often break 05. Also in the take-up motion the lever and the connecting rods laterally deflect, so that the stitch will not be tightened uniformly and sufiiciently. Machines of the type as above described havinga large number of levers and long connecting rods are very complicated and expensive.

In another type of thread stitching machines the movements are directly derived from large cam disks arranged on both sides of the machine which cam disks have very steep cam grooves. These machines can only work with a low number of revolutions, because the connections by virtue of the steep cam grooves deflect and vibrate.

All these disadvantages are overcome by the improved machine which is of very sim ple construction andpermits to work with a high number of revolutions increasing thus the output. p t

A structure embodying my invention and illustrating the principles thereof is shown in the accompanying drawings and will be hereinafter fully described and referred to in the appended claims.

Figure l is a side view and Fig.2 a front elevation of the machine.

The machine as shown in the drawing works with an eyed needle and a hooked needle. By means of this pair of needles thesheets are only stitched at one place, but two or more pairs of needles may be used for stitching large sheets.

' From the base 1 rise two lateral standards 2 and 3. The standard 2 has lateral brackets in which a vertical shaft 4 is rotatably journaled. The shaft 4 carries a cam 5 driving the prick-punch 6, a cam 7 driving the takeup 8, a cam 9 driving the thread clamp 10 and a cam 11 driving the eyed needle 12 and the hooked needle 18. All these cams are mounted upon the vertical shaft 4 in next proximity of the respective working members to be operated and at the same height as the carriers of these members. Two arms 14 and 15 mounted upon the horizontal shaft 16 carry the angular table 7 2, 7 3 upon which cured to a plate 27. This plate is supported by two rods 23 and 29 axially movable in eyes 30, 31, 32 and 33 of the arms 14 and carrying the table. Cross pins 34 and 35 are fixed upon the rods 28 and 29 and engaged by the forked ends of the levers 36 and 37 fixed upon a shaft 38 journaled in the arms 14 and 15. A third lever 39 mounted upon the shaft 38 carries a pivot 40 and also an antifriction roller 41 actuated by the cam 5.

A second cam 42 fixed upon the vertical shaft 4 actuates the thread-layer 43 secured to a plate 44 axially movable and guided in the arms 14 and 15. The plate 44 has a transverse bearing 45 in which a roller 46 pivoted at the free-end of the cam lever 47 engages. Another roller 48 also carried by the lever 47, but nearer to the axis of the lever 47 enters in the curved. groove of the cam 42 so that the rotations of the cam are transmitted to the lever 47 and consequently this lever imparts sliding movements to the plate 44 by means of the roller 46 and the bearing 45. A horizontal shaft 49 journaled in the standards 2 and 3 carries two levers 50 and 51 supporting the take-up 8 formed by a rod, which cooperates with a stationary rod 52 around which the stitching thread is passed, in order to be taken up by the rod 8. A third cam 7 secured to the vertical rod 4 acts upon the roller 54 of a cam lever 53 fixed upon the shaft 49.

Another horizontal shaft 55 journaled in the standards 2 and 3 carries two levers 56 and 57. These levers embrace cross-pins 58 and 59 fixed to the guide rods 60 carrying the sewing-needle-device. The rods 60 are guided in brackets 63 and 64 screwed to the standards 2 and 3. The sewing needle 12 is screwed to the sewing-needle-device while a sleeve 65 carrying a toothed pinion 66 is rotatably arranged on the said device, in order to turn the hooked needle in a known manner. A fourth cam 11 fixed upon the upper portion of the vertical shaft 4 acts upon the antifriction roller 68 of a cam-lever 67 secured to the shaft 55. A fifth cam 9 fixed upon the vertical shaft 4 acts upon a roller 71 of a cam-lever mounted upon a horizontal shaft 69 journaled in the brackets 63 and 64. This shaft carries the thread clampingarm.

The machine as above described operates as follows:

The sheet to be stitched is laid upon the angular table 72, 73 when it is moved into the extreme outer position whereupon the table with the sheet is swung inwardly under the needle-plate 74 of the machine. In this position the prick-punch 6 pierces a hole in the sheet into which the sewingneedle 12 with the thread and the hooked needle 13 with the hook directed forwardly and carrying ga loop enter afterward. Thereupon the thrcadlayer 43 is moved toward the left, see Fig. 2, so that the beak of the thread layer seizes the thread loop of the needle 12 and brings the same before the hooked me dle 13, which in the meantime has made half a revolution. The hook therefore is directed rearwardly. When the needles rise the thread brought on by the thread layer is seized by the hooked needle and the new thread loop is passed through the loop surrounding the hooked needle and belonging to the previously stitched sheet without taking along this loop. After the needles having reached the highest position, the hooked needle will again be turned for half a revolution, so that the hook is again directed to the front of the machine.

During this operation the thread is taken up and tightened by the action of the takeup 8. The thread clamp 10 releases the thread in the exact moment and clamps it again.

It will be seen that the driving of the dill? ferent working members takes place in a vertical plane put in the axis of the driving shaft 4 and that too only from one side of the machine, so that there is no tendency to distort the driving shaft. Transmitting elements liable to be strained, long levers and large complicated cams having grooves are also avoided. The vertical driving shaft delivers its motion to the carriers of the working members to prick the sheet to form the stitches to tighten the thread and to i am or clamp the same by means of simple cams and levers near these carriers and at approximately the same height as said carriers. This construction permits a very accurate and sure working of the motions even with a high number of revolutions, so that the output of the machine will be considerably increased and all the aforesaid disadvantages overcome. The structure of the machine is extremely simplified, so that the costs of the construction are considerably reduced.

lVhat I claim is:

1. The combination in a thread-stitchingmachine for book-binding, a movable table, working elements comprising an eyed needle, a hooked needle, a thread layer moving to and fro between these needles, a prickpunch, a thread-clamp, a take-up, a vertical shaft, carriers for said elements, cams secured to the vertical shaft near the carriers Q of the said working elements and at approximately the same height as the said carriers, small levers to transmit the movement of the cams to the carriers of the working members, means to drive the vertical shaft and means to bring the table in and out of the operative position.

2. The combination in a thread-stitchingmachine for book-binding, a swinging table, two arms carrying the table and fixed upon a horizontal shaft, two cam-disks fixed upon 13o another horizontal shaft and actuating tWo levers fixed upon the first named horizontal shaft to bring the table in and out of the operative position, Working elements comprising an eyed needle, a hooked needle, a thread layer moving to and fro between these needles, a priclepuneh, a thread-clamp, a take-up, a vertical shaft, carriers for said elements, cams secured to the vertical shaft near the carriers of the said Working elements and at approximately the same height as the said carriers, small levers to transmit the movement of the cams to the carriers of the Working elements and means to drive the vertical shaft.

In testimony whereof, I have signed my name to this specification.

ULRICH BISCHOF.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

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