US 3098431 A
Description (OCR text may contain errors)
y 3, 1963 E. c. WEAVER 3,098,431
REGISTRATION APPARATUS FOR SILK SCREEN PRINTING MACHINE Filed March 3, 1960 3 Sheets-Sheet 1 IN VEN TOR.
ELME/P C. WA VE/F GT5. 3 BY ATTORNEYS E. C. WEAVER July 23, 1963 REGISTRATION APPARATUS FOR SILK SCREEN PRINTING MACHINE 5 Sheets-Sheet 2 Filed March 3, 1960 4 VNs INVENTOR.
EL MEI? c. W54 m? 4 TTOR/VEVJ July 23, 1963 E. c. WEAVER 3,098,431
REGISTRATION APPARATUS FOR SILK SCREEN PRINTING MACHINE Filed March 3, 1960 3 Sheets-Sheet 3 INVENTOR. fLMEz? C. W154 VEl? QWMV% ATTORNEYS nite 3,698,431 Patented July 23, 1963 3,998,431 REGISTRATION APPARATUS FDR SllLK SCREEN PRlNTlING MACHlNE Elmer C. Weaver, Portage Township, Kalamazoo County,
Mich, assignor of one-half to Paul L. Lee and Georgia W. Lee, and one-half to Elmer C. Weaver and Emma D. Weaver Filed Mar. 3, 1960, er. No. 12,546 6 Claims. (Cl. 101-126) This invention relates in general to a highly accurate apparatus for adjusting the relative positions of two connected objects and, more particularly, to an apparatus for accurately and quickly adjusting the registration of the printing frame on a silk screen printing machine with respect to a work sheet supported upon the base structure of the machine.
The art of silk screen printing is very old and well understood. Thus, it is common knowledge that multicolored designs and signs can be applied to sheet material by a silk screen printing machine. It is equally well known that each color or each new design is usually applied to a group of work sheets by a different silk screen, which is generally mounted upon a frame. Accordingly, the screen frame is removably mounted upon the base structure of the printing machine so that it can be removed and replaced. Moreover, the screen is usually supported upon the base structure for movement between a substantially horizontal position adjacent to the work sheet supporting table and a position spaced upwardly therefrom.
A common method and structure for supporting the individual silk screen frames includes a rectangular chase which is hingedly supported upon the base structure of the machine adjacent to one edge of the work sheet supporting table. The chase usually has four rigid side elements which are arranged to form a rectangle and are connected together at their adjacent ends, hence at the corners of the rectangle. The screen frame is held within the chase by various types of clamps, screws, bolts and the like, which also serve to adjust the position of the silk screen with re spect to the chase, hence to effect registration of the screen with respect to the work table. There are other methods and structures for supporting the screen frame with respect to the remainder of the silk screen printing machine. However, the above-described machine is well suited to illustrate the problems which are commonly encountered in effecting proper registration of successive screen frames on those existing screen printing machines with which I am familiar.
Under normal circumstances, the registration of a screen frame with respect to the work supporting table presently requires tedious adjustments and readjustments of a plurality of independent, closely spaced adjusting devices connected between the chase and the screen supporting frame. Moreover, even after the screen frame appears to be located in the proper position, further adjustment is often necessary to remove distortions which usually develop in the silk screen during the positioning of the frame, and this often requires excessive set-up time, often more than an hour. More specific-ally, since neither the chase nor the screen frame is absolutely rigid, adjustments of the screen frame with respect to the chase often result in distortions of the design of the screen. The distortion in the silk screen is removed by a trial and error procedure, which is time consuming and often results in the production of several inaccurate work sheets which must be discarded.
During long delays resulting from such adjustments, the colorant may thicken and, therefore, require special treatment before it can be applied. It is standard practice to place the partially colored work sheets on racks which are supported in spaced relationship to promote drying and to prevent smearing. During long periods or adjustment, these racks occupy space and thereby increase overhead even though the sheets which they support are dry and ready to receive another color.
It is well known that some sheet material, such as paper, will vary in size due to changes in weather conditions. If a protracted delay is involved in properly effecting registration of a new silk screen frame, the weather conditions may change sufficiently to seriously change the size of the paper involved and thereby further complicate the operations. Thus, a constant effort is always being made to reduce the total time required to complete the printing operation upon a particular set of Work sheets.
Accordingly, a primary object of this invention has been the provision of an apparatus whereby a silk screen frame can be quickly and accurately mounted upon the base structure of a silk screen printing machine so that the silk screen will be in accurate registration with the work sheet or a previous design or configuration applied to the work sheet by a prior printing operation involving a different screen frame.
A further object of this invention has been the provi sion of an apparatus for elfecting registration, as aforesaid, which can be adapted to existing silk screen printing machines of many types, shapes and sizes.
A further object of this invention has been the provision of a registration apparatus, as aforesaid, which is capable of adjusting the silk screen frame with respect to the Work sheet supporting table or, byvvery minor changes, is capable of adjusting the work table with respect to the table supporting frame upon which the screen frame is hingedly supported.
A further object of this invention has been the provision of a registration apparatus, as aforesaid, which is capable of effecting the accurate registration of the screen frame without distorting in any way the screen supporting frame, hence without distorting certain portions of the screen.
A further object of this invention has been the provision of registration apparatus, as aforesaid, which is extremely simple in operation, which requires little or no maintenance, which is equally effective for making large rough adjustments or small, extremely accurate adjustment, which is sturdy in structure, which requires a minimum of space, which is relatively small and light in Weight, which can be fabricated from metallic parts for easy cleaning, and which can be constructed from standard parts, which, for the most part, are interchangeable regardless of the size of the screen and machine involved.
Other objects and purposes of this invention will become apparent to persons familiar with this type of equipment upon reading the following specification and examining the accompanying drawings, in which:
FIGURE 1 is a perspective view of a fragment of a silk screen printing machine including and illustrating a registration apparatus embodying the invention.
FIGURE 2 is a broken, top plan view of the registration apparatus shown in FIGURE 1.
FIGURE 3 is a sectional view taken along the line IIIIII in FIGURE 2.
FIGURE 4 is a sectional view taken along the line IV-IV in FIGURE 2.
FIGURE 5 is a sectional view taken along the line VV in FIGURE 3.
FIGURE 6 is an exploded perspective view of a screen engaging assembly in the registration apparatus.
FIGURE 7 is a sectional View taken along the line VIIVII in FIGURE 3.
FIGURE 8 is a fragmentary side elevational view of a silk screen printing machine equipped with an alternate registration apparatus embodying the invention.
FIGURE 9 is a fragmentary sectional view taken along the line IXIX in FIGURE 8.
FIGURE 10 is a sectional View taken along the line X-X in FIGURE 9.
FIGURE 11 is a plan view of an alternate registration apparatus.
FIGURE 12 is a sectional view taken along the line XII--XII of FIGURE l1.
FIGURE 13 is a sectional view taken along the line XIII-XIII of FIGURE 11.
For convenience in description, the terms upper, lower and derivatives thereof will have reference to the apparatus of the invention substantially as appearing in FIGURES 1 and 7. The terms front, rear and derivatives thereof will have reference to the printing machine as appearing in FIGURE 8, and substantially as appearing in FIGURE 1. The terms inner, outer and derivatives thereof will have reference to the geometric center of the apparatus embodying the invention and parts associated therewith.
General Description The objects and purposes of the invention, including those set forth above, have been achieved by providing an apparatus comprised of a pair of end brackets between and upon which an elongated bar is supported. An elongated tube is sleeved upon the bar and cam means mounted on said sleeve is arranged for engaging the bar and effect ing relative lengthwise movement of said sleeve and said bar. A pair of support members are adjustably mounted upon the sleeve and support elements are adjustably mounted upon the support members. Cam means is provided on the support members for effecting lengthwise movement of the support elements with respect to the support members and transversely of the sleeve. The support elements preferably have engaging means pivot ally connected to the ends thereof remote from the support members.
As shown in the drawings, the above-described apparatus may be utilized to effect registration between a silk screen frame and a sheet of material supported by the machine, of which the frame is a part. In one form of the invention, an edge of the screen frame is gripped by the engaging means on the support elements, and the end brackets are mounted upon the work supporting table or the base structure of a substantially conventional, silk screen printing machine. Accordingly, the apparatus of the invention serves not only as a device for effecting registration between the printing frame and the work sheet supported on the table, but also as a hinge mechanism whereby the screen frame is moved downwardly into, and upwardly out of, a substantially horizontal position adjacent to the upper surface of the work supporting table.
In another form of the invention, where the work supporting table is horizontally movable with respect to its support structure and the screen frame is hinged directly upon such support structure, the end brackets are secured to the table and the support elements are secured to the frame of the support structure.
Accordingly, the apparatus of the invention may be used either to move the screen frame with respect to the Work sheet or it may be used to move the work supporting table, hence the work sheet, with respect to the screen frame.
Detailed Construction The registration apparatus 110* (FIGURES 1 and 2), which has been selected to illustrate one preferred embodiment of the invention, is disclosed herein, for illustrative purposes, in combination with a silk screen printing machine 11 having a horizontal work supporting table 12 mounted upon a base structure 13. A screen supporting frame 16, which may be rectangular in shape and which has a silk screen 17 secured thereto, is hingedly mounted by means of said apparatus 10 upon the table 12. The table 12, base structure 13 and the screen frame 16 may be fabricated from conventional materials, such as Wood or metal. The printing machine 11 is intended to support a work sheet 18 upon which a design, lettering or the like is applied by the screen 17 in a substantially conventional manner.
The apparatus 10 (FIGURES l and 2) includes a pair of spaced, substantially identical end brackets 21 and 22 having flanges 23 and 24, respectively, which may be secured upon the upper surface of the table 12 near one edge thereof :by means such as bolts, welding or the like. The brackets 21 and 22 have bosses 26 and 27 spaced upwardly from the flanges 23 and 24, respectively, and having coaxial openings 28 and 29 (FIGURE 2) therethrough. A support shaft 32, which may be an elongated cylindrical rod or tube, extends between the brackets 21 and 22, and the opposite ends of the shaft 32 are removably received into and through the openings 28 and 29 in said end brackets 21 and 22. A holding device, such as the set screw 33 shown in the boss 26 (FIGURE 1) of the bracket 21, is provided on each end bracket for the purpose of securing the shaft 32 with respect to said brackets and providing adjustment of the apparatus to tables of various sizes.
As shown in FIGURES 3 and 5, the support shaft 32 has a plurality of uniformly spaced annular grooves 34 which are preferably located in the central portion of the shaft. An elongated sleeve 36, which may be a metal tube, is slidably and snugly supported upon the shaft 32 between the end brackets 21 and 22 so that it covers at least some of the grooves 34. A cylindrical housing 37, which is secured to and extends upwardly from said sleeve 36, has a central post opening 38 which also extends through the adjacent portion of the sleeve 36.
A control post 39 (FIGURES 3 and 7) is snugly, rotatably and axially slidably disposed within the post opening 38 and is extendable into the sleeve 36. Said post 39 has an integral, eccentric pin 42 which extends from the lower end of the post 39 for snug, but slidable reception into any one of the grooves 34. A manually engageable handle 4-3 is secured to the upper end of the post '39, which extends above the cylindrical housing 37 when the pin 42 is in one of the grooves 34. As shown in FIGURE 5, rotation of the post 39 by the handle 43 can effect an axial movement of the sleeve 36 with respect to the support shaft 32 when the pin 42 is in a groove 34. The eccentricity of the pin 42 and the spacing of the grooves 34 are such that the pin 42 can be received into either one of any two adjacent grooves when the sleeve 36 is in certain positions upon and along said shaft 32. Thus, by alternately rotating and raising said post 39 and thereby moving said pin from one groove to the next, the post 39 can effect a continuous movement of the sleeve 36 lengthwise of the shaft 32 for a distance approximately equal to the distance between the opposite ends of the group of grooves 34. It will be seen that the grooves 34 could be replaced by transverse slots uniformly spaced along the upper side of the shaft 32.
The post 39 (FIGURE 3) has between its upper and lower ends an annular groove 45 which is wider than the length of said pin 42. The housing 37 has a pair of diametrically opposed and radially disposed openings 40 and 41 (FIGURE 7), which communicate with the post opening 38 and with the annular groove 45. A U-shaped member 48, which is preferably resilient and flexible, has a pair of opposing fingers 49 and 50 which are extendable through the openings 40 and 41, respectively, and into the groove 45 to limit axial movement of the post 39 to the amount necessary to disengage the pin 42 from the slots 34.
A :boss 44 (FIGURE 3), which extends upwardly from sleeve 36 near the housing 37, has a threaded opening 46 in which the thumb screw 47 is threadedly received for engaging the support shaft 32 and thereby locking it against lengthwise movement with respect to the sleeve 36.
The apparatus (FIGURES 1 and 2) also includes a pair of adjustment members 51 .and 52 which are mounted upon and adjustable lengthwise of the sleeve 36 to support screens of different sizes, and are preferably located on opposite sides of the cylindrical housing 37. Since the adjustment members '51 and 52 are substantially identical in this particular embodiment, a detailed disclosure of the front adjustment member 51 will be given herein, and such description will be understood to apply in substances to the rear adjustment member 52.
The adjustment member 51 (FIGURES 4 and 6) includes a slide block 53 which is substantially rectangular and slightly flattened in shape, and which has a transverse opening 54 through which the sleeve 36 is slidably receivable. The block 53 has a horizontal .slot 56 which extends from one end thereof into the opening 54. A first bolt opening 57 extends substantially vertically through the block 53 and penetrates the slot 56. It will be understood that this specific reference to horizontal" and vertical is for illustrative purposes only. The upper end of the bolt opening 57 has an enlarged portion 58 which is spaced from the slot 56 for reception of the head of the bolt 59. The part of the bolt opening 57 below the slot 56 is threaded for threaded engagement with the bolt 59. Thus, the portions of the block 53 above and below the slot 56 can be moved toward each other by tightening the bolt 59, whereby the sleeve 36 can be clamped within the sleeve opening 54.
The slide block 53 (FIGURE 4) has .a lengthwise, subtantially cylindrical and horizontal rod opening 62 which extends lengthwise thereof and is located below and transversely of the sleeve opening 54. An elongated support element 63, which may be a metal rod or bar, is slidably disposed within the opening 62 for movement lengthwise thereof. A thumb screw opening 64, which is adjacent to the bolt opening 59, extends downwardly through the block 53 and is threaded below the slot 56 for threaded engagement by a thumb screw 66. The lower end of the thumb screw opening 64 communicates with the rod opening 62 so that the thumb screw 66 can be caused to engage the support element 63 within the block 53 and prevent relative lengthwise movement therebetween.
The rear adjustment member 52 (FIGURES 1 and 2) includes a block 53a having a slot 56a and a rod opening 62a in substantially the same manner as set forth above with respect to the adjustment member 51. A support element 67, which is slidably supported within the rod opening 62a, is preferably but not necessarily substantially identical to the support elements 63.
Support element 63 (FIGURE 6) has a plurality of uniformly spaced, annular grooves 68 which are similar to the grooves 34 in the shaft 32. The block 53 (FIG- URE 4) has a vertical post opening 69 in which a control post 72 is rotatably, slidably and snugly disposed, the lower end ofsaid post opening 69 communicating with the rod opening 62. The lower end of the control post 72 has an integral, eccentric pin 73 which is slidably, snugly and rotatably receivable into each of the grooves 68, one at a time, for effecting advancement of the support element 63 through the block 53 in small, accurate increments. The upper end of the control post 72 has a manually engageable handle 75 whereby the post 72 can be rotated or raised.
The block '53 has a pair of openings, such .as the opening 70 shown in FIGURE 1, which are preferably coaxial and extend through the block into the post opening 69. A U-shaped member 71, which may be similar to the U-shaped member 48 (FIGURE 7) has end portions which are extendable through said openings 70 into an annular groove 74 (FIGURE 4) in the post 72 to limit 6 its .axial movement in the manner stated above with respect to the post 39.
The adjustment member 52. has a control post 72a (FIGURE 2), which may be identical with the control post 72. Said post 72a has a manually engageable handle 75a and is held in the block 53a by a U-shaped spring member 71a.
A pair of frame clamps and 81 (FIGURES l and 2), which engage an edge of the screen frame 16, are mounted upon the outer ends of the support elements 63 and 67, respectively. More specifically, the clamp 80 has a pivot plate 77 which is pivotally disposed within a notch 76 (FIGURE 6) in the outer end lower surfaces of the element 63. A bolt 78 extends upwardly through the opening 79 in the plate 77 and .a corresponding opening 82 is in the adjacent end of the support element 63 for engagement by a nut 83. The pivot plate 77 has a pair of spaced, integral hinge arms 86 and 87 (FIGURE 6) with coaxial, hinge pin openings 88 and 89, respectively, through which the hinge pin 92 is slidably receivable. The opening 79 in the pivot plate 77 may be elongated slightly in a direction substantially parallel with the axis of the hinge pin openings 88 and 89 for the purpose of permitting some movement of the pivot plate 77 with respect to the support element 63. The support element 63 (FIGURE 4) has a pair of substantially vertical, threaded openings 95 and 97 on opposite sides of the block 53 into which the adjustment thumb screws 98 and 100 are respectively and threadedly received for engagement with the upper surface of the table 12 to control the position of the hinge pin 92, hence its axis, with respect to the top of said table 12.
The frame clamp 80 (FIGURE 6) includes a lower jaw 93 having an integral hinge arm 94 extending from its rear end for snug, pivotable reception into the space between the hinge arms 86 and 87. Said hinge arm 94 has a hinge pin opening 96 through which the hinge pin 92 is slidably received for hingedly supporting the lower jaw 93 upon the pivot plate 77.
The lower jaw 93 (FIGURE 6) has secured thereto an upwardly extending screw 99 which is substantially perpendicular to the frame engaging plate 102 on the jaw 93 and rearwardly thereof. The frame clamp 80 also includes an upper jaw 103 having a frame engaging plate 104 with an integral boss 106 which has a smooth bore opening 107 through which the screw 99 is slidably received. The upper end of the screw 99 is engagedby a wing nut 108 for urging the upper jaw 103- downwardly toward the lower jaw 93 when an edge of the screen frame 16 (FIGURE 1) is disposed therebetween.
The frame clamp 81 (FIGURES l and 2), which is mounted upon the support element 67 and is preferably identical with the frame clamp 80, includes a pivot plate 77a, a lower jaw 93a, an upper jaw 103a and a screw 9911 which are preferably, but not necessarily, substantially identical to their counterparts in the frame clamp 80. Adjustment screws 98a and 100a are provided on the support element 67 for substantially the same purposes as set forth above with respect to the adjustment screws 98 and 1100.
Operation With the apparatus 10 mounted upon the table 12 of a printing machine 11, substantially as shown in FIG- URE 1, said apparatus 10 can be quickly and easily adjusted for engagement with, and subsequent control over the operation of, a screen frame 16 of any size within the operating limits of the table 12. For relatively wide screen frames, for example, the adjustment members 51 and 52 are spaced a substantial distance from each other to eltect a proper engagement and support of the screen frame by the frame clamps 80 and 81. Adjustment of the members 51 and 52 along the sleeve 36 is easily and quickly effected by loosening the bolts 59 and 59a, sliding the adjustment members along the sleeve to the desired positions and then tightening the bolts. The wing nuts 168 and 108a on the frame clamps 80 and 81, respectively, are loosened sufficiently to permit the edge of the screen frame 16 to be inserted between the upper and lower jaws of each frame clamp. The wing nuts 108 and 188a are then tightened so that said screen frame is firmly gripped Within the clamps 80 and 81.
With the screen frame 16 resting upon the upper surface of the table 12, the thumbscrews 98 and 100 on support element 63 and the studs 98a and 180a on element 67 are adjusted so that the hinge pins 92 and 92a, hence the screen 17, are properly spaced from the work sheet 18 supported upon said table. Approximate registration of, the silk screen 17 with the work sheet 18, which has been properly located upon the table .12 by means including the stop element 112 (FIGURE 1), may be effected by first adjusting the sleeve 36 with respect to the shaft 32. That is, the thumb screw 47, which positively holds the sleeve 36 in a fixed position upon support shaft 32, is loosened. The control post 39 is raised by the handle 43 until the pin 42 is above, and out of engagement with, the support shaft 32. The U-shaped member 48 prevents accidental disengagement of the post 39 from the housing 37 during the upward movement thereof. The screen frame 16, the sleeve 36, the adjustment members 51 and 52, and the frame clamps 86 and 81 can now be moved simultaneously frontwardly or reanwardly of the table 12 along the shaft 32 until the screen 17 is in approximate alignment with the work sheet 18. The post 39' is now moved against the support shaft 32 and rotated until the pin 42 thereon is received into the groove 34- aligned with the shaft opening 38. Accordingly, the control post 39 is now positioned for effecting small accurate adjustments of the screen frame 16 along the shaft 32.
However, before effecting such adjustments by means of post 39, the screen 17 is aligned approximately with the work sheet in a direction toward or away from the sleeve 36. That is, the set screws 66 and 66a are loosened in the blocks 53 and 53a so that the support elements 63 and 67 can be moved with respect to said blocks 53 and 53a. Both of the control posts 72 and 72a are raised by the control handles 75 and 75a so that their respective pins, such as the pin 73 and the post 73, are disengaged from the elements 63 and 67, respectively. The U-shaped members 71 and 71a prevent accidental disengagement of the posts 72 and 72a from their respective blocks 53 and 53a. The screen frame .16, the clamps 80 and 81, and the support elements 63 and 67 can now be easily moved toward and away from the sleeve 36.
Alternatively, one of the posts 72 and 72a at a time can be raised whereby first one side and then the other side of the screen frame 16 can be adjusted with respect to the sleeve 36 until said frame is in said approximate alignment with the work sheet 18. The pivotal connection of the pivot plates 77 and 77a with the support elements 63 and 67 permits limited pivotal movement of the screen frame 16 around a vertical axis during such adjustment. The posts 72 and 72a are now caused to engage the elements 63 and 67 so that the eccentric pin 73 on post 72 is disposed in a slot 68 in element 63, and post 72a is similarly engaged with the element 67.
After the approximate adjustment has been thusly made between the screen frame 16 and the Work sheet 18, the control posts 39, 72 and 72a are rotated by their respective handles 43, 75 and 75a to effect the final accurate adjustment of the silk screen 17 with respect to the work sheet 18 disposed directly below the screen. It will be seen that such adjustment can be effected accurately without distorting the screen frame 16 or the silk 17 supported thereby. The adjustment studs 98, 98a, 100 and 100a may now require further adjustment so that the lower jaws 93 and 93a will be at the proper distance above the table top 12 to effect the desired movement of the screen frame '16 around the hinge pins 92 and 92a into and out of the horizontal position. In this particular case, the sleeve 36 can rotate upon the shaft 32 to permit such adjustment of the position of the elements 63 and 67. How ever, such movement can also be permitted by loosening the shaft 32 in the brackets 21 and 22, or by loosening the support blocks 53 and 53a upon the sleeve 36. The set screws 47, 66 and 66a are how tightened so that the sleeve 36 is locked with respem to the support shaft 32 and the support elements 63 and 67 are locked with respect to the sleeve 36.
The printing machine .11 is now in condition for operation wherein the frame 16 is first moved upwardly around the hinge axis of the hinge pins 92 and 92a so that a work sheet 18 can be located upon the table top 12 by means including the stop element 112. The screen frame 16 is then lowered into position adjacent to the upper surface of the worksheet 18 and a liquid colorant or the like is applied to the upper surface of the screen 17 in a substantially conventional manner for the purpose of printing the worksheet.
When it becomes desirable or necessary to remove or replace the screen frame 16, such can be effected quickly and easily by loosening the frame clamps and 81. If the screw frame then replaced by another screen frame, the above operations whereby accurate registration is accomplished, are repeated. After a printing machine operator has used the apparatus 10 a few times he can easily learn to place the screen frame 16 into the clamps 80 and 81 so that the approximate alignment of the frame with the work sheet is generally unnecessary, particularly Where screen frames of the same size are being exchanged. In such case, proper adjustment can be effected by loosening the set screws 47, 66 and 66a, by properly rotating the handles 43, 75 and 75a, and then tightening the set screws 47, 66 and 66a.
It will be observed that large adjustments of the frame can be made in the horizontal directions by alternately rotating the posts 39, 72. and 72a and moving their respective pins from one slot to the next along the shaft 32 and elements 63 and 67, respectively.
It is well known that, in some printing machines, the screen supporting frame is removably and adjustably supported in and upon a chase or outer frame which is hingedly mounted upon the table or base structure of the machine, as shown in FIGURE 8. In such case, the frame clamps 80 and 81 (FIGURE 1) may be substantially permanently attached to the chase which, in general, will have the same size and shape as the frame 16 appearing in FIGURE 1. The screen 17, instead of being directly connected to the chase, is mounted upon a smaller, separate frame which is supported within the chase in a conventional manner. The chase, hence the screen frame supported thereby, will normally be in approximate alignment with the worksheet. Accordingly, accurate registration of the silk screen with the worksheet, which has been the real problem in prior machines, can be quickly and easily accomplished by the apparatus 18 as set forth above.
Alternate Structures The alternate registration apparatus (FIGURES 8 and 9) is designed for use with a silk screen printing machine 121 having a rectangular, screen supporting chase 122 which is hingedly supported near one edge thereof upon one edge of the rectangular frame at the top of the support base 123. A table top 124 is mounted on said frame 125 for movement in a substantially horizontal direction beneath said chase. The table top 124 is supported upon bearing balls 138 which are mounted upon support pads 131 secured in the corners of the frame 125.
A table lock 135 (FIGURE 10) may be mounted upon one edge of the frame 125 for engaging the table top 124 and holding it against movement with respect to the frame 125. The lock 135 includes a clamp plate 135a connected to the top 124 by a screw 135k for the purpose of engaging the frame 125 to effect said holding of the table top 124 with respect to said frame 125. As shown in FIGURE 9 the frame 125 has a frame element 126 which is adjacent to the lower surface of the table top 124 and extends transversely of the hinge axis of the chase 122.
The alternate apparatus 126 (FIGURE 9) includes a pair of end brackets 127 and 128, and a support shaft 129 extending between and supported upon said end brackets. The brackets and shaft may be substantially identical to the end brackets 21 and 22 and support shaft 32, respectively, in FIGURE 1. The end brackets 127 and 128 are secured to the lower surface of the table top 124 adjacent to the front edge of the printing machine 121. A sleeve 132, which may be substantially identical to the sleeve 36, is supported upon a shaft 129 between the end brackets 127 and 128.
A control post 133 (FIGURE 8), which may be similar both in structure and operation to the control post 39, is supported in a cylindrical housing 134 for the purpose of effecting relative movement between the sleeve 132 and support shaft 129. The post 133 has a handle 136 on its outer end and an eccentric pin (not shown) on its inner end for engagement with slots (not shown) in the shaft 129 for effecting said relative movement. The post 133 extends downwardly from the sleeve 132 where the handle 136 can be easily and manually engaged at the front of the machine. The set screws 141 and 142, which may be similar in function to the set screw 33, have elongated shanks with manually engageable handles 143 and 144 at their lower ends.
The alternate apparatus 120 (FIGURE 9) includes a pair of adjustment members 14-6 and 147 which are adjustably supported upon the sleeve 132 and which may be substantially identical to the adjustment members 51 and 52. Control posts 148 and 148a having handles 149 and 149a, respectively, are supported in the blocks 151 and 151a. Support elements 152 and 153, which may be substantially identical to the elements 63 and 67, extend through openings in the blocks 151 and 151a for en gagement by said posts. The outer ends of the support elements 152 and 153 are notched to engage a pair of links 154 and 156, respectively. The link 154 is pivotally connetced to the outer end of the support element 152 by the pin bolt 157 and rigidly secured to the frame element 126 on the support base 123 by bolts 158. The link 156 is pivotally connected both to the support element 153 and to the frame element 126 by the bolts 159 and 161, respectively.
Operation of the alternate registration apparatus 120 is substantially the same as the operation of the apparatus 111, except that the apparatus 121) shifts the table top 124 with respect to the support base 123 upon which the chase 122 is hingedly mounted. Accordingly, with a worksheet supported upon the table top 1 24 and with the chase 122 adjacent thereto, adjustment of the table 124 toward and away from the hinge axis of the chase 122 is effected by loosening the set screws 141 and 142 and turning the handle 136, after which the set screws 141 and 142 are tightened. Adjustment of the table top 124 in a direction parallel with the hinge axis of the chase 122 is effected by loosening set screws held in the blocks 151 and 151a for engaging support elements 152 and 153, and then rotating one or both of the handles 143 and 144, after which said set screws are tightened.
U-shaped spring members 162, which are removably mounted upon the post housing 134 and the blocks 151 and 151a, may be identical to, and serve substantially the same purposes as, the members 48, 71 and 71a in the apparatus 11 Thus, the members 162 will positively prevent accidental removal of the posts 133, 148 and 148a from the remainder of the apparatus 1211. Removal of the spring members 162, and subsequent removal of the posts associated therewith, is effected by spreading apart the free ends of the spring members 162.
It will follow from the above description of the alternate apparatus 121), that a further alternate arrangement can be provided wherein the end brackets 127 and 128 are 19 rigidly held with respect to the support base 123 and the support elements 152 and 153 are connected to the table top 124 by appropriate links to provide an arrangement similar to the apparatus 120.
The alternate registration apparatus 166 appearing in FIGURES 11 and 12 is similar to the apparatus 10 appearing in FIGURE 1 and is capable of carrying out at least the essential, if not all of the, objects and purposes of the invention by means of a structure which is slightly less complicated and possibly less costly than the structure of the apparatus 11 More specifically, the alternate registration apparatus 166 includes a support shaft 167 adjustably mounted upon and between a pair of end brackets 168 and 169, in a manner generally similar to that described with respect to the shaft 32 and end brackets 21 and 22.
A pair of sleeve 171 and 172 (FIGURE 11) are slidably supported upon the shaft 167 which has a plurality of uniformly spaced, annular grooves 173. The sleeves 171 and 17 2 are engageable at their adjacent ends and are encircled at their remote ends by a pair of locking collars 174 and 176. The sleeves 171 and 172 each have a pair of lengthwise, diametrically disposed slots in their remote ends as indicated by the slot 177 (FIGURE 11) in sleeve 171. Screws 178 and 179 are threadedly received through threaded openings in the locking collars 174 and 176 for engagement with the adjacent portions of the shaft 167.
The sleeve 172 (FIGURE 13) has an upstanding, hollow cylinder 181 secured thereto and communicating with the interior of the sleeve. A control post 182, having an eccentric pin 183 extending from its lower end, is rotatably supported within said cylinder so that said pin 183 is extendable into one of the grooves 173 in the manner set forth in detail above with respect to the control post 39 and parts associated therewith.
A pair of substantially parallel and advantageously identical tubes 184 and 136 are rigidly secured, as by welding, near one end of each to the lower sides of the sleeves 171 and 172, respectively, so that said tubes extend transversely of and in the same direction from said shaft. The tube 134 (FIGURE 12) has an upright, hollow cylinder 187 thereon communicating with the interior of the tube. The control post 188 is rotatably supported within said cylinder 187 so that the pin 191 at the lower end thereof is extendable into the tube 184.
An elongated support element 132 (FIGURE 12) is slidably supported within the tube 184 and has a plurality of uniformly spaced, annular grooves 194 into which the pin 191 is receivable for effecting lengthwise movement of the element 192 in response to rotation of the control post 188. The outer end of the sleeve 171, which has a pair of diametrically disposed, horizontal slots 196, is encircled by a locking collar 197. A thumb screw 199 is threadedly received through a threaded opening in the collar 197 for engagement with the tube 184 whereby the support element 192 is clamped Within the tube 134. The support element 192 may be connected at its outer end to an engaging device, such as the frame clamp 202, which may be identical to the clamp 80, for the purpose of engaging the edge of a printing frame 2114.
The tube 186 (FIGURE 11) supports a control post 189', support element 193, a collar 1%, thumb screw 201 and frame clamp 203 which may be, and preferably are, substantially identical to the corresponding parts mounted upon the tube 134, as discussed above, both in structure and operation.
After the brackets 168 and 169 have been mounted upon a structure, such as the table 12 shown in FIGURE 1, the shaft 167 is then locked in place with respect to said brackets by means, such as a set screw, not shown. The screws 178 and 179 (FIGURE 11) are then loosened so that the sleeves 171 and 17 2 can be moved along the shaft 167 until the clamps 2112 and 2113 are properly located with respect to the screen frame 264 which is then engaged by the clamps 2%.? and 203. By appropriate rotation of the control post 182, the sleeve 172, the sleeve 171 and the frame 204 are moved lengthwise of the shaft 167 until proper registration of the frame 204 is obtained in that direction. The screws 1'78 and 1'79 are now tightened whereby the encircled portions of the sleeves 1'71 and 172 are caused to grip and thereby become fixed with respect to the shaft 167.
After loosening the screws 19% and 201, similar adjustment of the support elements 192 and 1 3 lengthwise of the tubes 184 and 135 is effected by rotating the control posts 188 and 189. By this action, the frame 2% is moved toward or away from the shaft 167. When proper registration of the frame 294 is obtained in this direction, the screws 199 and v261 are tightened whereby the position of the frame 204 with respect to the shaft 167 is fixed.
The frame 264 is now in accurate registration and can be moved into and out of a substantially horizontal position by pivotal movement around the hinges in the clamps 2&2 and 2&3 in a manner substantially as set forth with respect to the corresponding operation of the frame 16 in FIGURE 1.
Under some circumstances, and particularly where automatic or semi-automatic printing machines are involved, it may be desinable to have a chase which is permanently and hingedly connected to the base structure of the ma chine. In such case, it may be desirable to mount the apparatus 166 upon the chase and connect the clamps 202 and 2&3 to a screen frame supported in the chase.
Although particular, preferred embodiments of the invention have been disclosed in detail above for illustrative purposes, it will be understood that other variations or modifications of such disclosure, which lie within the scope of the appended claims, are fully contemplated.
What is claimed is:
1. In a silk screen printing machine having a base structure supporting a substantially horizontal top member and having a screen frame movable into and out of a position adjacent to and parallel with said top member, an apparatus for effecting registration of said screen frame with .a worksheet supported upon said top member, comprising: a pair of brackets rigidly secured to said base structure near one edge thereof; a support shaft supported upon and between said brackets; an elongated sleeve supported upon said support shaft between said brackets for movement lengthwise of said shaft; first manually operable cam means supported upon said sleeve and engaged with said shaft for effecting relative lengthwise movement therebetween, said first cam means i11- cluding a first post rotatably supported upon said sleeve transversely thereof, said first post having an eccentric pin extending axially from one axial end thereof, and a plurality of spaced, transverse grooves in said support shaft into which said eccentric pin is selectively and rotatably received; a pair of spaced support members mounted upon said sleeve; a pair of elongated, substantially parallel support elements slidably and respectively supported upon said support members for lengthwise movement transversely of said shaft; second manually operable cam means mounted upon each support member and engageable with said support elements for effecting said lengthwise movement thereof, said second cam means including a pair of second posts respectively and rotatably supported upon said members, said second posts each having an eccentric pin extending axially from one axial end thereof and a manually engageable handle at the other end thereof, and a plurality of spaced transverse grooves in each support element into which the eccentric pin on the corresponding second post is selectively and rotatably received; and engaging means pivotally secured to the extended ends of said support elements and connected to one of the screen frame and the top member.
2. In a printing machine having a base structure and a worksheet engaging member supported upon said base structure for movement with respect thereto, an apparatus for accurately positioning said member with respect to said structure, comprising: a support shaft; means including a pair of spaced brackets connected to said shaft and supported upon one of the structure and the member; sleeve means supported upon said shaft for axial movement with respect thereto; first cam means on said shaft adjacent said sleeve; first eccentric means rotatably mounted upon said sleeve means and engageable with said first cam means so that rotation of said eccentric means effects relative lengthwise movement between said shaft and said sleeve; 21 pair of support members mounted upon said sleeve means; a pair of elongated, substantially parallel support elements mounted upon and extending from said support members for lengthwise movement transversely of the shaft; second cam means on each of said support elements; second eccentric means rotatably mounted upon each of said support members and engageable with said second cam means so that rotation of said second eccentric means effects said movement of said support elements; and engaging means connecting the extended ends of said support elements to the other of said structure and said member.
3. In a silk screen printing machine having a base structure supporting a substantially horizontal top member and having a screen frame movable into and out of a position adjacent to and parallel with said top member, an apparatus for effecting registration of said screen frame with a worksheet supported upon said top member, comprising: a pair of brackets rigidly secured to said base structure near one edge thereof; a support shaft supported upon and between said brackets; sleeve means supported upon said support shaft between said brackets for movement lengthwise of said shaft; first cam means ecured to said shaft within said sleeve; first manually operable means rotatably mounted upon said sleeve means for movement around an axis transverse of said shaft, said manually operable means having eccentric pin means engageable with said first cam means so that rotation of said manually operable means around said axis effects relative lengthwise movement between said shaft and said sleeve; a pair of spaced support members mounted upon said sleeve; a pair of elongated, substantially parallel support elements slidably and respectively supported upon said support members for lengthwise movement with respect to said support members and transversely of said shaft; second cam means secured to each of said support elements adjacent to said support members; second manually operable means rotatably mounted upon each of said support members for movement around axes transverse respectively of said support elements, said second manually operable means having eccentric pin means respectively engageable with said second cam means so that rotation of said second manually operable means around said axes effects said movement of said support elements with respect to said sup port members; and engaging means secured to the extended ends of said support elements and connected to one of the screen frame and the top member, said engaging means including pivot means.
4. The structure of claim 3 wherein said engaging means is connected to said screen frame and includes hinge means for effecting hinged movement of said screen frame; wherein said sleeve is rotatably supported upon said shaft; and including adjustment means mounted upon each of said support elements and engaged with said top member for adjusting the positions of said support elements around said shaft and with respect to said top member.
5. The structure of claim 3 wherein said screen frame is hingedly mounted upon said base structure near one edge of said top member for movement into and out of a substantially horizontal position adjacent to the' upper surface of the top member; wherein said top member is 13 horizontally movable with respect to said base structure; wherein said brackets are secured to the lower surface of said top member, and said engaging means on said support elements are secured to said base structure.
6. The structure of claim 3 wherein said brackets are secured to one of said top member and said base struccure, and said engaging means is secured to the other of said top member and base structure; and including lock means on said base structure for holding said top member with respect thereto.
References Cited in the file of this patent UNITED STATES PATENTS 836,814- Klaczko Nov. 27, 1906 Moats Oct. 11, Flockhart Dec. 19, Stockman Nov. 19, Lawrence Mar. 30, Podgor Apr. 14,
FOREIGN PATENTS Australia Dec. 5,